/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1997, 1998 Kenneth D. Merry. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "devstat.h" int compute_stats(struct devstat *current, struct devstat *previous, long double etime, u_int64_t *total_bytes, u_int64_t *total_transfers, u_int64_t *total_blocks, long double *kb_per_transfer, long double *transfers_per_second, long double *mb_per_second, long double *blocks_per_second, long double *ms_per_transaction); typedef enum { DEVSTAT_ARG_NOTYPE, DEVSTAT_ARG_UINT64, DEVSTAT_ARG_LD, DEVSTAT_ARG_SKIP } devstat_arg_type; char devstat_errbuf[DEVSTAT_ERRBUF_SIZE]; /* * Table to match descriptive strings with device types. These are in * order from most common to least common to speed search time. */ struct devstat_match_table match_table[] = { {"da", DEVSTAT_TYPE_DIRECT, DEVSTAT_MATCH_TYPE}, {"cd", DEVSTAT_TYPE_CDROM, DEVSTAT_MATCH_TYPE}, {"scsi", DEVSTAT_TYPE_IF_SCSI, DEVSTAT_MATCH_IF}, {"ide", DEVSTAT_TYPE_IF_IDE, DEVSTAT_MATCH_IF}, {"other", DEVSTAT_TYPE_IF_OTHER, DEVSTAT_MATCH_IF}, {"nvme", DEVSTAT_TYPE_IF_NVME, DEVSTAT_MATCH_IF}, {"worm", DEVSTAT_TYPE_WORM, DEVSTAT_MATCH_TYPE}, {"sa", DEVSTAT_TYPE_SEQUENTIAL,DEVSTAT_MATCH_TYPE}, {"pass", DEVSTAT_TYPE_PASS, DEVSTAT_MATCH_PASS}, {"optical", DEVSTAT_TYPE_OPTICAL, DEVSTAT_MATCH_TYPE}, {"array", DEVSTAT_TYPE_STORARRAY, DEVSTAT_MATCH_TYPE}, {"changer", DEVSTAT_TYPE_CHANGER, DEVSTAT_MATCH_TYPE}, {"scanner", DEVSTAT_TYPE_SCANNER, DEVSTAT_MATCH_TYPE}, {"printer", DEVSTAT_TYPE_PRINTER, DEVSTAT_MATCH_TYPE}, {"floppy", DEVSTAT_TYPE_FLOPPY, DEVSTAT_MATCH_TYPE}, {"proc", DEVSTAT_TYPE_PROCESSOR, DEVSTAT_MATCH_TYPE}, {"comm", DEVSTAT_TYPE_COMM, DEVSTAT_MATCH_TYPE}, {"enclosure", DEVSTAT_TYPE_ENCLOSURE, DEVSTAT_MATCH_TYPE}, {NULL, 0, 0} }; struct devstat_args { devstat_metric metric; devstat_arg_type argtype; } devstat_arg_list[] = { { DSM_NONE, DEVSTAT_ARG_NOTYPE }, { DSM_TOTAL_BYTES, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BYTES_READ, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BYTES_WRITE, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_TRANSFERS, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_TRANSFERS_READ, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_TRANSFERS_WRITE, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_TRANSFERS_OTHER, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BLOCKS, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BLOCKS_READ, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BLOCKS_WRITE, DEVSTAT_ARG_UINT64 }, { DSM_KB_PER_TRANSFER, DEVSTAT_ARG_LD }, { DSM_KB_PER_TRANSFER_READ, DEVSTAT_ARG_LD }, { DSM_KB_PER_TRANSFER_WRITE, DEVSTAT_ARG_LD }, { DSM_TRANSFERS_PER_SECOND, DEVSTAT_ARG_LD }, { DSM_TRANSFERS_PER_SECOND_READ, DEVSTAT_ARG_LD }, { DSM_TRANSFERS_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, { DSM_TRANSFERS_PER_SECOND_OTHER, DEVSTAT_ARG_LD }, { DSM_MB_PER_SECOND, DEVSTAT_ARG_LD }, { DSM_MB_PER_SECOND_READ, DEVSTAT_ARG_LD }, { DSM_MB_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, { DSM_BLOCKS_PER_SECOND, DEVSTAT_ARG_LD }, { DSM_BLOCKS_PER_SECOND_READ, DEVSTAT_ARG_LD }, { DSM_BLOCKS_PER_SECOND_WRITE, DEVSTAT_ARG_LD }, { DSM_MS_PER_TRANSACTION, DEVSTAT_ARG_LD }, { DSM_MS_PER_TRANSACTION_READ, DEVSTAT_ARG_LD }, { DSM_MS_PER_TRANSACTION_WRITE, DEVSTAT_ARG_LD }, { DSM_SKIP, DEVSTAT_ARG_SKIP }, { DSM_TOTAL_BYTES_FREE, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_TRANSFERS_FREE, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_BLOCKS_FREE, DEVSTAT_ARG_UINT64 }, { DSM_KB_PER_TRANSFER_FREE, DEVSTAT_ARG_LD }, { DSM_MB_PER_SECOND_FREE, DEVSTAT_ARG_LD }, { DSM_TRANSFERS_PER_SECOND_FREE, DEVSTAT_ARG_LD }, { DSM_BLOCKS_PER_SECOND_FREE, DEVSTAT_ARG_LD }, { DSM_MS_PER_TRANSACTION_OTHER, DEVSTAT_ARG_LD }, { DSM_MS_PER_TRANSACTION_FREE, DEVSTAT_ARG_LD }, { DSM_BUSY_PCT, DEVSTAT_ARG_LD }, { DSM_QUEUE_LENGTH, DEVSTAT_ARG_UINT64 }, { DSM_TOTAL_DURATION, DEVSTAT_ARG_LD }, { DSM_TOTAL_DURATION_READ, DEVSTAT_ARG_LD }, { DSM_TOTAL_DURATION_WRITE, DEVSTAT_ARG_LD }, { DSM_TOTAL_DURATION_FREE, DEVSTAT_ARG_LD }, { DSM_TOTAL_DURATION_OTHER, DEVSTAT_ARG_LD }, { DSM_TOTAL_BUSY_TIME, DEVSTAT_ARG_LD }, }; static const char *namelist[] = { #define X_NUMDEVS 0 "_devstat_num_devs", #define X_GENERATION 1 "_devstat_generation", #define X_VERSION 2 "_devstat_version", #define X_DEVICE_STATQ 3 "_device_statq", #define X_TIME_UPTIME 4 "_time_uptime", #define X_END 5 }; /* * Local function declarations. */ static int compare_select(const void *arg1, const void *arg2); static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes); static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes); static char *get_devstat_kvm(kvm_t *kd); #define KREADNL(kd, var, val) \ readkmem_nl(kd, namelist[var], &val, sizeof(val)) int devstat_getnumdevs(kvm_t *kd) { size_t numdevsize; int numdevs; numdevsize = sizeof(int); /* * Find out how many devices we have in the system. */ if (kd == NULL) { if (sysctlbyname("kern.devstat.numdevs", &numdevs, &numdevsize, NULL, 0) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting number of devices\n" "%s: %s", __func__, __func__, strerror(errno)); return(-1); } else return(numdevs); } else { if (KREADNL(kd, X_NUMDEVS, numdevs) == -1) return(-1); else return(numdevs); } } /* * This is an easy way to get the generation number, but the generation is * supplied in a more atmoic manner by the kern.devstat.all sysctl. * Because this generation sysctl is separate from the statistics sysctl, * the device list and the generation could change between the time that * this function is called and the device list is retrieved. */ long devstat_getgeneration(kvm_t *kd) { size_t gensize; long generation; gensize = sizeof(long); /* * Get the current generation number. */ if (kd == NULL) { if (sysctlbyname("kern.devstat.generation", &generation, &gensize, NULL, 0) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting devstat generation\n%s: %s", __func__, __func__, strerror(errno)); return(-1); } else return(generation); } else { if (KREADNL(kd, X_GENERATION, generation) == -1) return(-1); else return(generation); } } /* * Get the current devstat version. The return value of this function * should be compared with DEVSTAT_VERSION, which is defined in * sys/devicestat.h. This will enable userland programs to determine * whether they are out of sync with the kernel. */ int devstat_getversion(kvm_t *kd) { size_t versize; int version; versize = sizeof(int); /* * Get the current devstat version. */ if (kd == NULL) { if (sysctlbyname("kern.devstat.version", &version, &versize, NULL, 0) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting devstat version\n%s: %s", __func__, __func__, strerror(errno)); return(-1); } else return(version); } else { if (KREADNL(kd, X_VERSION, version) == -1) return(-1); else return(version); } } /* * Check the devstat version we know about against the devstat version the * kernel knows about. If they don't match, print an error into the * devstat error buffer, and return -1. If they match, return 0. */ int devstat_checkversion(kvm_t *kd) { int buflen, res, retval = 0, version; version = devstat_getversion(kd); if (version != DEVSTAT_VERSION) { /* * If getversion() returns an error (i.e. -1), then it * has printed an error message in the buffer. Therefore, * we need to add a \n to the end of that message before we * print our own message in the buffer. */ if (version == -1) buflen = strlen(devstat_errbuf); else buflen = 0; res = snprintf(devstat_errbuf + buflen, DEVSTAT_ERRBUF_SIZE - buflen, "%s%s: userland devstat version %d is not " "the same as the kernel\n%s: devstat " "version %d\n", version == -1 ? "\n" : "", __func__, DEVSTAT_VERSION, __func__, version); if (res < 0) devstat_errbuf[buflen] = '\0'; buflen = strlen(devstat_errbuf); if (version < DEVSTAT_VERSION) res = snprintf(devstat_errbuf + buflen, DEVSTAT_ERRBUF_SIZE - buflen, "%s: libdevstat newer than kernel\n", __func__); else res = snprintf(devstat_errbuf + buflen, DEVSTAT_ERRBUF_SIZE - buflen, "%s: kernel newer than libdevstat\n", __func__); if (res < 0) devstat_errbuf[buflen] = '\0'; retval = -1; } return(retval); } /* * Get the current list of devices and statistics, and the current * generation number. * * Return values: * -1 -- error * 0 -- device list is unchanged * 1 -- device list has changed */ int devstat_getdevs(kvm_t *kd, struct statinfo *stats) { int error; size_t dssize; long oldgeneration; int retval = 0; struct devinfo *dinfo; struct timespec ts; dinfo = stats->dinfo; if (dinfo == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: stats->dinfo was NULL", __func__); return(-1); } oldgeneration = dinfo->generation; if (kd == NULL) { clock_gettime(CLOCK_MONOTONIC, &ts); stats->snap_time = ts.tv_sec + ts.tv_nsec * 1e-9; /* If this is our first time through, mem_ptr will be null. */ if (dinfo->mem_ptr == NULL) { /* * Get the number of devices. If it's negative, it's an * error. Don't bother setting the error string, since * getnumdevs() has already done that for us. */ if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) return(-1); /* * The kern.devstat.all sysctl returns the current * generation number, as well as all the devices. * So we need four bytes more. */ dssize = (dinfo->numdevs * sizeof(struct devstat)) + sizeof(long); dinfo->mem_ptr = (u_int8_t *)malloc(dssize); if (dinfo->mem_ptr == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: Cannot allocate memory for mem_ptr element", __func__); return(-1); } } else dssize = (dinfo->numdevs * sizeof(struct devstat)) + sizeof(long); /* * Request all of the devices. We only really allow for one * ENOMEM failure. It would, of course, be possible to just go * in a loop and keep reallocing the device structure until we * don't get ENOMEM back. I'm not sure it's worth it, though. * If devices are being added to the system that quickly, maybe * the user can just wait until all devices are added. */ for (;;) { error = sysctlbyname("kern.devstat.all", dinfo->mem_ptr, &dssize, NULL, 0); if (error != -1 || errno != EBUSY) break; } if (error == -1) { /* * If we get ENOMEM back, that means that there are * more devices now, so we need to allocate more * space for the device array. */ if (errno == ENOMEM) { /* * No need to set the error string here, * devstat_getnumdevs() will do that if it fails. */ if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) return(-1); dssize = (dinfo->numdevs * sizeof(struct devstat)) + sizeof(long); dinfo->mem_ptr = (u_int8_t *) realloc(dinfo->mem_ptr, dssize); if ((error = sysctlbyname("kern.devstat.all", dinfo->mem_ptr, &dssize, NULL, 0)) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting device " "stats\n%s: %s", __func__, __func__, strerror(errno)); return(-1); } } else { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting device stats\n" "%s: %s", __func__, __func__, strerror(errno)); return(-1); } } } else { if (KREADNL(kd, X_TIME_UPTIME, ts.tv_sec) == -1) return(-1); else stats->snap_time = ts.tv_sec; /* * This is of course non-atomic, but since we are working * on a core dump, the generation is unlikely to change */ if ((dinfo->numdevs = devstat_getnumdevs(kd)) == -1) return(-1); if ((dinfo->mem_ptr = (u_int8_t *)get_devstat_kvm(kd)) == NULL) return(-1); } /* * The sysctl spits out the generation as the first four bytes, * then all of the device statistics structures. */ dinfo->generation = *(long *)dinfo->mem_ptr; /* * If the generation has changed, and if the current number of * devices is not the same as the number of devices recorded in the * devinfo structure, it is likely that the device list has shrunk. * The reason that it is likely that the device list has shrunk in * this case is that if the device list has grown, the sysctl above * will return an ENOMEM error, and we will reset the number of * devices and reallocate the device array. If the second sysctl * fails, we will return an error and therefore never get to this * point. If the device list has shrunk, the sysctl will not * return an error since we have more space allocated than is * necessary. So, in the shrinkage case, we catch it here and * reallocate the array so that we don't use any more space than is * necessary. */ if (oldgeneration != dinfo->generation) { if (devstat_getnumdevs(kd) != dinfo->numdevs) { if ((dinfo->numdevs = devstat_getnumdevs(kd)) < 0) return(-1); dssize = (dinfo->numdevs * sizeof(struct devstat)) + sizeof(long); dinfo->mem_ptr = (u_int8_t *)realloc(dinfo->mem_ptr, dssize); } retval = 1; } dinfo->devices = (struct devstat *)(dinfo->mem_ptr + sizeof(long)); return(retval); } /* * selectdevs(): * * Devices are selected/deselected based upon the following criteria: * - devices specified by the user on the command line * - devices matching any device type expressions given on the command line * - devices with the highest I/O, if 'top' mode is enabled * - the first n unselected devices in the device list, if maxshowdevs * devices haven't already been selected and if the user has not * specified any devices on the command line and if we're in "add" mode. * * Input parameters: * - device selection list (dev_select) * - current number of devices selected (num_selected) * - total number of devices in the selection list (num_selections) * - devstat generation as of the last time selectdevs() was called * (select_generation) * - current devstat generation (current_generation) * - current list of devices and statistics (devices) * - number of devices in the current device list (numdevs) * - compiled version of the command line device type arguments (matches) * - This is optional. If the number of devices is 0, this will be ignored. * - The matching code pays attention to the current selection mode. So * if you pass in a matching expression, it will be evaluated based * upon the selection mode that is passed in. See below for details. * - number of device type matching expressions (num_matches) * - Set to 0 to disable the matching code. * - list of devices specified on the command line by the user (dev_selections) * - number of devices selected on the command line by the user * (num_dev_selections) * - Our selection mode. There are four different selection modes: * - add mode. (DS_SELECT_ADD) Any devices matching devices explicitly * selected by the user or devices matching a pattern given by the * user will be selected in addition to devices that are already * selected. Additional devices will be selected, up to maxshowdevs * number of devices. * - only mode. (DS_SELECT_ONLY) Only devices matching devices * explicitly given by the user or devices matching a pattern * given by the user will be selected. No other devices will be * selected. * - addonly mode. (DS_SELECT_ADDONLY) This is similar to add and * only. Basically, this will not de-select any devices that are * current selected, as only mode would, but it will also not * gratuitously select up to maxshowdevs devices as add mode would. * - remove mode. (DS_SELECT_REMOVE) Any devices matching devices * explicitly selected by the user or devices matching a pattern * given by the user will be de-selected. * - maximum number of devices we can select (maxshowdevs) * - flag indicating whether or not we're in 'top' mode (perf_select) * * Output data: * - the device selection list may be modified and passed back out * - the number of devices selected and the total number of items in the * device selection list may be changed * - the selection generation may be changed to match the current generation * * Return values: * -1 -- error * 0 -- selected devices are unchanged * 1 -- selected devices changed */ int devstat_selectdevs(struct device_selection **dev_select, int *num_selected, int *num_selections, long *select_generation, long current_generation, struct devstat *devices, int numdevs, struct devstat_match *matches, int num_matches, char **dev_selections, int num_dev_selections, devstat_select_mode select_mode, int maxshowdevs, int perf_select) { int i, j, k; int init_selections = 0, init_selected_var = 0; struct device_selection *old_dev_select = NULL; int old_num_selections = 0, old_num_selected; int selection_number = 0; int changed = 0, found = 0; if ((dev_select == NULL) || (devices == NULL) || (numdevs < 0)) return(-1); /* * We always want to make sure that we have as many dev_select * entries as there are devices. */ /* * In this case, we haven't selected devices before. */ if (*dev_select == NULL) { *dev_select = (struct device_selection *)malloc(numdevs * sizeof(struct device_selection)); *select_generation = current_generation; init_selections = 1; changed = 1; /* * In this case, we have selected devices before, but the device * list has changed since we last selected devices, so we need to * either enlarge or reduce the size of the device selection list. * But delay the resizing until after copying the data to old_dev_select * as to not lose any data in the case of reducing the size. */ } else if (*num_selections != numdevs) { *select_generation = current_generation; init_selections = 1; /* * In this case, we've selected devices before, and the selection * list is the same size as it was the last time, but the device * list has changed. */ } else if (*select_generation < current_generation) { *select_generation = current_generation; init_selections = 1; } if (*dev_select == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: Cannot (re)allocate memory for dev_select argument", __func__); return(-1); } /* * If we're in "only" mode, we want to clear out the selected * variable since we're going to select exactly what the user wants * this time through. */ if (select_mode == DS_SELECT_ONLY) init_selected_var = 1; /* * In all cases, we want to back up the number of selected devices. * It is a quick and accurate way to determine whether the selected * devices have changed. */ old_num_selected = *num_selected; /* * We want to make a backup of the current selection list if * the list of devices has changed, or if we're in performance * selection mode. In both cases, we don't want to make a backup * if we already know for sure that the list will be different. * This is certainly the case if this is our first time through the * selection code. */ if (((init_selected_var != 0) || (init_selections != 0) || (perf_select != 0)) && (changed == 0)){ old_dev_select = (struct device_selection *)malloc( *num_selections * sizeof(struct device_selection)); if (old_dev_select == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: Cannot allocate memory for selection list backup", __func__); return(-1); } old_num_selections = *num_selections; bcopy(*dev_select, old_dev_select, sizeof(struct device_selection) * *num_selections); } if (!changed && *num_selections != numdevs) { *dev_select = (struct device_selection *)reallocf(*dev_select, numdevs * sizeof(struct device_selection)); } if (init_selections != 0) { bzero(*dev_select, sizeof(struct device_selection) * numdevs); for (i = 0; i < numdevs; i++) { (*dev_select)[i].device_number = devices[i].device_number; strncpy((*dev_select)[i].device_name, devices[i].device_name, DEVSTAT_NAME_LEN); (*dev_select)[i].device_name[DEVSTAT_NAME_LEN - 1]='\0'; (*dev_select)[i].unit_number = devices[i].unit_number; (*dev_select)[i].position = i; } *num_selections = numdevs; } else if (init_selected_var != 0) { for (i = 0; i < numdevs; i++) (*dev_select)[i].selected = 0; } /* we haven't gotten around to selecting anything yet.. */ if ((select_mode == DS_SELECT_ONLY) || (init_selections != 0) || (init_selected_var != 0)) *num_selected = 0; /* * Look through any devices the user specified on the command line * and see if they match known devices. If so, select them. */ for (i = 0; (i < *num_selections) && (num_dev_selections > 0); i++) { char tmpstr[80]; snprintf(tmpstr, sizeof(tmpstr), "%s%d", (*dev_select)[i].device_name, (*dev_select)[i].unit_number); for (j = 0; j < num_dev_selections; j++) { if (strcmp(tmpstr, dev_selections[j]) == 0) { /* * Here we do different things based on the * mode we're in. If we're in add or * addonly mode, we only select this device * if it hasn't already been selected. * Otherwise, we would be unnecessarily * changing the selection order and * incrementing the selection count. If * we're in only mode, we unconditionally * select this device, since in only mode * any previous selections are erased and * manually specified devices are the first * ones to be selected. If we're in remove * mode, we de-select the specified device and * decrement the selection count. */ switch(select_mode) { case DS_SELECT_ADD: case DS_SELECT_ADDONLY: if ((*dev_select)[i].selected) break; /* FALLTHROUGH */ case DS_SELECT_ONLY: (*dev_select)[i].selected = ++selection_number; (*num_selected)++; break; case DS_SELECT_REMOVE: (*dev_select)[i].selected = 0; (*num_selected)--; /* * This isn't passed back out, we * just use it to keep track of * how many devices we've removed. */ num_dev_selections--; break; } break; } } } /* * Go through the user's device type expressions and select devices * accordingly. We only do this if the number of devices already * selected is less than the maximum number we can show. */ for (i = 0; (i < num_matches) && (*num_selected < maxshowdevs); i++) { /* We should probably indicate some error here */ if ((matches[i].match_fields == DEVSTAT_MATCH_NONE) || (matches[i].num_match_categories <= 0)) continue; for (j = 0; j < numdevs; j++) { int num_match_categories; num_match_categories = matches[i].num_match_categories; /* * Determine whether or not the current device * matches the given matching expression. This if * statement consists of three components: * - the device type check * - the device interface check * - the passthrough check * If a the matching test is successful, it * decrements the number of matching categories, * and if we've reached the last element that * needed to be matched, the if statement succeeds. * */ if ((((matches[i].match_fields & DEVSTAT_MATCH_TYPE)!=0) && ((devices[j].device_type & DEVSTAT_TYPE_MASK) == (matches[i].device_type & DEVSTAT_TYPE_MASK)) &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) || (((matches[i].match_fields & DEVSTAT_MATCH_PASS) == 0) && ((devices[j].device_type & DEVSTAT_TYPE_PASS) == 0))) && (--num_match_categories == 0)) || (((matches[i].match_fields & DEVSTAT_MATCH_IF) != 0) && ((devices[j].device_type & DEVSTAT_TYPE_IF_MASK) == (matches[i].device_type & DEVSTAT_TYPE_IF_MASK)) &&(((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) || (((matches[i].match_fields & DEVSTAT_MATCH_PASS) == 0) && ((devices[j].device_type & DEVSTAT_TYPE_PASS) == 0))) && (--num_match_categories == 0)) || (((matches[i].match_fields & DEVSTAT_MATCH_PASS)!=0) && ((devices[j].device_type & DEVSTAT_TYPE_PASS) != 0) && (--num_match_categories == 0))) { /* * This is probably a non-optimal solution * to the problem that the devices in the * device list will not be in the same * order as the devices in the selection * array. */ for (k = 0; k < numdevs; k++) { if ((*dev_select)[k].position == j) { found = 1; break; } } /* * There shouldn't be a case where a device * in the device list is not in the * selection list...but it could happen. */ if (found != 1) { fprintf(stderr, "selectdevs: couldn't" " find %s%d in selection " "list\n", devices[j].device_name, devices[j].unit_number); break; } /* * We do different things based upon the * mode we're in. If we're in add or only * mode, we go ahead and select this device * if it hasn't already been selected. If * it has already been selected, we leave * it alone so we don't mess up the * selection ordering. Manually specified * devices have already been selected, and * they have higher priority than pattern * matched devices. If we're in remove * mode, we de-select the given device and * decrement the selected count. */ switch(select_mode) { case DS_SELECT_ADD: case DS_SELECT_ADDONLY: case DS_SELECT_ONLY: if ((*dev_select)[k].selected != 0) break; (*dev_select)[k].selected = ++selection_number; (*num_selected)++; break; case DS_SELECT_REMOVE: (*dev_select)[k].selected = 0; (*num_selected)--; break; } } } } /* * Here we implement "top" mode. Devices are sorted in the * selection array based on two criteria: whether or not they are * selected (not selection number, just the fact that they are * selected!) and the number of bytes in the "bytes" field of the * selection structure. The bytes field generally must be kept up * by the user. In the future, it may be maintained by library * functions, but for now the user has to do the work. * * At first glance, it may seem wrong that we don't go through and * select every device in the case where the user hasn't specified * any devices or patterns. In fact, though, it won't make any * difference in the device sorting. In that particular case (i.e. * when we're in "add" or "only" mode, and the user hasn't * specified anything) the first time through no devices will be * selected, so the only criterion used to sort them will be their * performance. The second time through, and every time thereafter, * all devices will be selected, so again selection won't matter. */ if (perf_select != 0) { /* Sort the device array by throughput */ qsort(*dev_select, *num_selections, sizeof(struct device_selection), compare_select); if (*num_selected == 0) { /* * Here we select every device in the array, if it * isn't already selected. Because the 'selected' * variable in the selection array entries contains * the selection order, the devstats routine can show * the devices that were selected first. */ for (i = 0; i < *num_selections; i++) { if ((*dev_select)[i].selected == 0) { (*dev_select)[i].selected = ++selection_number; (*num_selected)++; } } } else { selection_number = 0; for (i = 0; i < *num_selections; i++) { if ((*dev_select)[i].selected != 0) { (*dev_select)[i].selected = ++selection_number; } } } } /* * If we're in the "add" selection mode and if we haven't already * selected maxshowdevs number of devices, go through the array and * select any unselected devices. If we're in "only" mode, we * obviously don't want to select anything other than what the user * specifies. If we're in "remove" mode, it probably isn't a good * idea to go through and select any more devices, since we might * end up selecting something that the user wants removed. Through * more complicated logic, we could actually figure this out, but * that would probably require combining this loop with the various * selections loops above. */ if ((select_mode == DS_SELECT_ADD) && (*num_selected < maxshowdevs)) { for (i = 0; i < *num_selections; i++) if ((*dev_select)[i].selected == 0) { (*dev_select)[i].selected = ++selection_number; (*num_selected)++; } } /* * Look at the number of devices that have been selected. If it * has changed, set the changed variable. Otherwise, if we've * made a backup of the selection list, compare it to the current * selection list to see if the selected devices have changed. */ if ((changed == 0) && (old_num_selected != *num_selected)) changed = 1; else if ((changed == 0) && (old_dev_select != NULL)) { /* * Now we go through the selection list and we look at * it three different ways. */ for (i = 0; (i < *num_selections) && (changed == 0) && (i < old_num_selections); i++) { /* * If the device at index i in both the new and old * selection arrays has the same device number and * selection status, it hasn't changed. We * continue on to the next index. */ if (((*dev_select)[i].device_number == old_dev_select[i].device_number) && ((*dev_select)[i].selected == old_dev_select[i].selected)) continue; /* * Now, if we're still going through the if * statement, the above test wasn't true. So we * check here to see if the device at index i in * the current array is the same as the device at * index i in the old array. If it is, that means * that its selection number has changed. Set * changed to 1 and exit the loop. */ else if ((*dev_select)[i].device_number == old_dev_select[i].device_number) { changed = 1; break; } /* * If we get here, then the device at index i in * the current array isn't the same device as the * device at index i in the old array. */ else { found = 0; /* * Search through the old selection array * looking for a device with the same * device number as the device at index i * in the current array. If the selection * status is the same, then we mark it as * found. If the selection status isn't * the same, we break out of the loop. * Since found isn't set, changed will be * set to 1 below. */ for (j = 0; j < old_num_selections; j++) { if (((*dev_select)[i].device_number == old_dev_select[j].device_number) && ((*dev_select)[i].selected == old_dev_select[j].selected)){ found = 1; break; } else if ((*dev_select)[i].device_number == old_dev_select[j].device_number) break; } if (found == 0) changed = 1; } } } if (old_dev_select != NULL) free(old_dev_select); return(changed); } /* * Comparison routine for qsort() above. Note that the comparison here is * backwards -- generally, it should return a value to indicate whether * arg1 is <, =, or > arg2. Instead, it returns the opposite. The reason * it returns the opposite is so that the selection array will be sorted in * order of decreasing performance. We sort on two parameters. The first * sort key is whether or not one or the other of the devices in question * has been selected. If one of them has, and the other one has not, the * selected device is automatically more important than the unselected * device. If neither device is selected, we judge the devices based upon * performance. */ static int compare_select(const void *arg1, const void *arg2) { if ((((const struct device_selection *)arg1)->selected) && (((const struct device_selection *)arg2)->selected == 0)) return(-1); else if ((((const struct device_selection *)arg1)->selected == 0) && (((const struct device_selection *)arg2)->selected)) return(1); else if (((const struct device_selection *)arg2)->bytes < ((const struct device_selection *)arg1)->bytes) return(-1); else if (((const struct device_selection *)arg2)->bytes > ((const struct device_selection *)arg1)->bytes) return(1); else return(0); } /* * Take a string with the general format "arg1,arg2,arg3", and build a * device matching expression from it. */ int devstat_buildmatch(char *match_str, struct devstat_match **matches, int *num_matches) { char *tstr[5]; char **tempstr; int num_args; int i, j; /* We can't do much without a string to parse */ if (match_str == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: no match expression", __func__); return(-1); } /* * Break the (comma delimited) input string out into separate strings. */ for (tempstr = tstr, num_args = 0; (*tempstr = strsep(&match_str, ",")) != NULL && (num_args < 5);) if (**tempstr != '\0') { num_args++; if (++tempstr >= &tstr[5]) break; } /* The user gave us too many type arguments */ if (num_args > 3) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: too many type arguments", __func__); return(-1); } if (*num_matches == 0) *matches = NULL; *matches = (struct devstat_match *)reallocf(*matches, sizeof(struct devstat_match) * (*num_matches + 1)); if (*matches == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: Cannot allocate memory for matches list", __func__); return(-1); } /* Make sure the current entry is clear */ bzero(&matches[0][*num_matches], sizeof(struct devstat_match)); /* * Step through the arguments the user gave us and build a device * matching expression from them. */ for (i = 0; i < num_args; i++) { char *tempstr2, *tempstr3; /* * Get rid of leading white space. */ tempstr2 = tstr[i]; while (isspace(*tempstr2) && (*tempstr2 != '\0')) tempstr2++; /* * Get rid of trailing white space. */ tempstr3 = &tempstr2[strlen(tempstr2) - 1]; while ((*tempstr3 != '\0') && (tempstr3 > tempstr2) && (isspace(*tempstr3))) { *tempstr3 = '\0'; tempstr3--; } /* * Go through the match table comparing the user's * arguments to known device types, interfaces, etc. */ for (j = 0; match_table[j].match_str != NULL; j++) { /* * We do case-insensitive matching, in case someone * wants to enter "SCSI" instead of "scsi" or * something like that. Only compare as many * characters as are in the string in the match * table. This should help if someone tries to use * a super-long match expression. */ if (strncasecmp(tempstr2, match_table[j].match_str, strlen(match_table[j].match_str)) == 0) { /* * Make sure the user hasn't specified two * items of the same type, like "da" and * "cd". One device cannot be both. */ if (((*matches)[*num_matches].match_fields & match_table[j].match_field) != 0) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: cannot have more than " "one match item in a single " "category", __func__); return(-1); } /* * If we've gotten this far, we have a * winner. Set the appropriate fields in * the match entry. */ (*matches)[*num_matches].match_fields |= match_table[j].match_field; (*matches)[*num_matches].device_type |= match_table[j].type; (*matches)[*num_matches].num_match_categories++; break; } } /* * We should have found a match in the above for loop. If * not, that means the user entered an invalid device type * or interface. */ if ((*matches)[*num_matches].num_match_categories != (i + 1)) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: unknown match item \"%s\"", __func__, tstr[i]); return(-1); } } (*num_matches)++; return(0); } /* * Compute a number of device statistics. Only one field is mandatory, and * that is "current". Everything else is optional. The caller passes in * pointers to variables to hold the various statistics he desires. If he * doesn't want a particular staistic, he should pass in a NULL pointer. * Return values: * 0 -- success * -1 -- failure */ int compute_stats(struct devstat *current, struct devstat *previous, long double etime, u_int64_t *total_bytes, u_int64_t *total_transfers, u_int64_t *total_blocks, long double *kb_per_transfer, long double *transfers_per_second, long double *mb_per_second, long double *blocks_per_second, long double *ms_per_transaction) { return(devstat_compute_statistics(current, previous, etime, total_bytes ? DSM_TOTAL_BYTES : DSM_SKIP, total_bytes, total_transfers ? DSM_TOTAL_TRANSFERS : DSM_SKIP, total_transfers, total_blocks ? DSM_TOTAL_BLOCKS : DSM_SKIP, total_blocks, kb_per_transfer ? DSM_KB_PER_TRANSFER : DSM_SKIP, kb_per_transfer, transfers_per_second ? DSM_TRANSFERS_PER_SECOND : DSM_SKIP, transfers_per_second, mb_per_second ? DSM_MB_PER_SECOND : DSM_SKIP, mb_per_second, blocks_per_second ? DSM_BLOCKS_PER_SECOND : DSM_SKIP, blocks_per_second, ms_per_transaction ? DSM_MS_PER_TRANSACTION : DSM_SKIP, ms_per_transaction, DSM_NONE)); } /* This is 1/2^64 */ #define BINTIME_SCALE 5.42101086242752217003726400434970855712890625e-20 long double devstat_compute_etime(struct bintime *cur_time, struct bintime *prev_time) { long double etime; etime = cur_time->sec; etime += cur_time->frac * BINTIME_SCALE; if (prev_time != NULL) { etime -= prev_time->sec; etime -= prev_time->frac * BINTIME_SCALE; } return(etime); } #define DELTA(field, index) \ (current->field[(index)] - (previous ? previous->field[(index)] : 0)) #define DELTA_T(field) \ devstat_compute_etime(¤t->field, \ (previous ? &previous->field : NULL)) int devstat_compute_statistics(struct devstat *current, struct devstat *previous, long double etime, ...) { u_int64_t totalbytes, totalbytesread, totalbyteswrite, totalbytesfree; u_int64_t totaltransfers, totaltransfersread, totaltransferswrite; u_int64_t totaltransfersother, totalblocks, totalblocksread; u_int64_t totalblockswrite, totaltransfersfree, totalblocksfree; long double totalduration, totaldurationread, totaldurationwrite; long double totaldurationfree, totaldurationother; va_list ap; devstat_metric metric; u_int64_t *destu64; long double *destld; int retval; retval = 0; /* * current is the only mandatory field. */ if (current == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: current stats structure was NULL", __func__); return(-1); } totalbytesread = DELTA(bytes, DEVSTAT_READ); totalbyteswrite = DELTA(bytes, DEVSTAT_WRITE); totalbytesfree = DELTA(bytes, DEVSTAT_FREE); totalbytes = totalbytesread + totalbyteswrite + totalbytesfree; totaltransfersread = DELTA(operations, DEVSTAT_READ); totaltransferswrite = DELTA(operations, DEVSTAT_WRITE); totaltransfersother = DELTA(operations, DEVSTAT_NO_DATA); totaltransfersfree = DELTA(operations, DEVSTAT_FREE); totaltransfers = totaltransfersread + totaltransferswrite + totaltransfersother + totaltransfersfree; totalblocks = totalbytes; totalblocksread = totalbytesread; totalblockswrite = totalbyteswrite; totalblocksfree = totalbytesfree; if (current->block_size > 0) { totalblocks /= current->block_size; totalblocksread /= current->block_size; totalblockswrite /= current->block_size; totalblocksfree /= current->block_size; } else { totalblocks /= 512; totalblocksread /= 512; totalblockswrite /= 512; totalblocksfree /= 512; } totaldurationread = DELTA_T(duration[DEVSTAT_READ]); totaldurationwrite = DELTA_T(duration[DEVSTAT_WRITE]); totaldurationfree = DELTA_T(duration[DEVSTAT_FREE]); totaldurationother = DELTA_T(duration[DEVSTAT_NO_DATA]); totalduration = totaldurationread + totaldurationwrite + totaldurationfree + totaldurationother; va_start(ap, etime); while ((metric = (devstat_metric)va_arg(ap, devstat_metric)) != 0) { if (metric == DSM_NONE) break; if (metric >= DSM_MAX) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: metric %d is out of range", __func__, metric); retval = -1; goto bailout; } switch (devstat_arg_list[metric].argtype) { case DEVSTAT_ARG_UINT64: destu64 = (u_int64_t *)va_arg(ap, u_int64_t *); break; case DEVSTAT_ARG_LD: destld = (long double *)va_arg(ap, long double *); break; case DEVSTAT_ARG_SKIP: destld = (long double *)va_arg(ap, long double *); break; default: retval = -1; goto bailout; break; /* NOTREACHED */ } if (devstat_arg_list[metric].argtype == DEVSTAT_ARG_SKIP) continue; switch (metric) { case DSM_TOTAL_BYTES: *destu64 = totalbytes; break; case DSM_TOTAL_BYTES_READ: *destu64 = totalbytesread; break; case DSM_TOTAL_BYTES_WRITE: *destu64 = totalbyteswrite; break; case DSM_TOTAL_BYTES_FREE: *destu64 = totalbytesfree; break; case DSM_TOTAL_TRANSFERS: *destu64 = totaltransfers; break; case DSM_TOTAL_TRANSFERS_READ: *destu64 = totaltransfersread; break; case DSM_TOTAL_TRANSFERS_WRITE: *destu64 = totaltransferswrite; break; case DSM_TOTAL_TRANSFERS_FREE: *destu64 = totaltransfersfree; break; case DSM_TOTAL_TRANSFERS_OTHER: *destu64 = totaltransfersother; break; case DSM_TOTAL_BLOCKS: *destu64 = totalblocks; break; case DSM_TOTAL_BLOCKS_READ: *destu64 = totalblocksread; break; case DSM_TOTAL_BLOCKS_WRITE: *destu64 = totalblockswrite; break; case DSM_TOTAL_BLOCKS_FREE: *destu64 = totalblocksfree; break; case DSM_KB_PER_TRANSFER: *destld = totalbytes; *destld /= 1024; if (totaltransfers > 0) *destld /= totaltransfers; else *destld = 0.0; break; case DSM_KB_PER_TRANSFER_READ: *destld = totalbytesread; *destld /= 1024; if (totaltransfersread > 0) *destld /= totaltransfersread; else *destld = 0.0; break; case DSM_KB_PER_TRANSFER_WRITE: *destld = totalbyteswrite; *destld /= 1024; if (totaltransferswrite > 0) *destld /= totaltransferswrite; else *destld = 0.0; break; case DSM_KB_PER_TRANSFER_FREE: *destld = totalbytesfree; *destld /= 1024; if (totaltransfersfree > 0) *destld /= totaltransfersfree; else *destld = 0.0; break; case DSM_TRANSFERS_PER_SECOND: if (etime > 0.0) { *destld = totaltransfers; *destld /= etime; } else *destld = 0.0; break; case DSM_TRANSFERS_PER_SECOND_READ: if (etime > 0.0) { *destld = totaltransfersread; *destld /= etime; } else *destld = 0.0; break; case DSM_TRANSFERS_PER_SECOND_WRITE: if (etime > 0.0) { *destld = totaltransferswrite; *destld /= etime; } else *destld = 0.0; break; case DSM_TRANSFERS_PER_SECOND_FREE: if (etime > 0.0) { *destld = totaltransfersfree; *destld /= etime; } else *destld = 0.0; break; case DSM_TRANSFERS_PER_SECOND_OTHER: if (etime > 0.0) { *destld = totaltransfersother; *destld /= etime; } else *destld = 0.0; break; case DSM_MB_PER_SECOND: *destld = totalbytes; *destld /= 1024 * 1024; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_MB_PER_SECOND_READ: *destld = totalbytesread; *destld /= 1024 * 1024; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_MB_PER_SECOND_WRITE: *destld = totalbyteswrite; *destld /= 1024 * 1024; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_MB_PER_SECOND_FREE: *destld = totalbytesfree; *destld /= 1024 * 1024; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_BLOCKS_PER_SECOND: *destld = totalblocks; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_BLOCKS_PER_SECOND_READ: *destld = totalblocksread; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_BLOCKS_PER_SECOND_WRITE: *destld = totalblockswrite; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; case DSM_BLOCKS_PER_SECOND_FREE: *destld = totalblocksfree; if (etime > 0.0) *destld /= etime; else *destld = 0.0; break; /* * Some devstat callers update the duration and some don't. * So this will only be accurate if they provide the * duration. */ case DSM_MS_PER_TRANSACTION: if (totaltransfers > 0) { *destld = totalduration; *destld /= totaltransfers; *destld *= 1000; } else *destld = 0.0; break; case DSM_MS_PER_TRANSACTION_READ: if (totaltransfersread > 0) { *destld = totaldurationread; *destld /= totaltransfersread; *destld *= 1000; } else *destld = 0.0; break; case DSM_MS_PER_TRANSACTION_WRITE: if (totaltransferswrite > 0) { *destld = totaldurationwrite; *destld /= totaltransferswrite; *destld *= 1000; } else *destld = 0.0; break; case DSM_MS_PER_TRANSACTION_FREE: if (totaltransfersfree > 0) { *destld = totaldurationfree; *destld /= totaltransfersfree; *destld *= 1000; } else *destld = 0.0; break; case DSM_MS_PER_TRANSACTION_OTHER: if (totaltransfersother > 0) { *destld = totaldurationother; *destld /= totaltransfersother; *destld *= 1000; } else *destld = 0.0; break; case DSM_BUSY_PCT: *destld = DELTA_T(busy_time); if (*destld < 0) *destld = 0; *destld /= etime; *destld *= 100; if (*destld < 0) *destld = 0; break; case DSM_QUEUE_LENGTH: *destu64 = current->start_count - current->end_count; break; case DSM_TOTAL_DURATION: *destld = totalduration; break; case DSM_TOTAL_DURATION_READ: *destld = totaldurationread; break; case DSM_TOTAL_DURATION_WRITE: *destld = totaldurationwrite; break; case DSM_TOTAL_DURATION_FREE: *destld = totaldurationfree; break; case DSM_TOTAL_DURATION_OTHER: *destld = totaldurationother; break; case DSM_TOTAL_BUSY_TIME: *destld = DELTA_T(busy_time); break; /* * XXX: comment out the default block to see if any case's are missing. */ #if 1 default: /* * This shouldn't happen, since we should have * caught any out of range metrics at the top of * the loop. */ snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: unknown metric %d", __func__, metric); retval = -1; goto bailout; break; /* NOTREACHED */ #endif } } bailout: va_end(ap); return(retval); } static int readkmem(kvm_t *kd, unsigned long addr, void *buf, size_t nbytes) { if (kvm_read(kd, addr, buf, nbytes) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error reading value (kvm_read): %s", __func__, kvm_geterr(kd)); return(-1); } return(0); } static int readkmem_nl(kvm_t *kd, const char *name, void *buf, size_t nbytes) { struct nlist nl[2]; nl[0].n_name = (char *)name; nl[1].n_name = NULL; if (kvm_nlist(kd, nl) == -1) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: error getting name list (kvm_nlist): %s", __func__, kvm_geterr(kd)); return(-1); } return(readkmem(kd, nl[0].n_value, buf, nbytes)); } /* * This duplicates the functionality of the kernel sysctl handler for poking * through crash dumps. */ static char * get_devstat_kvm(kvm_t *kd) { int i, wp; long gen; struct devstat *nds; struct devstat ds; struct devstatlist dhead; int num_devs; char *rv = NULL; if ((num_devs = devstat_getnumdevs(kd)) <= 0) return(NULL); if (KREADNL(kd, X_DEVICE_STATQ, dhead) == -1) return(NULL); nds = STAILQ_FIRST(&dhead); if ((rv = malloc(sizeof(gen))) == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: out of memory (initial malloc failed)", __func__); return(NULL); } gen = devstat_getgeneration(kd); memcpy(rv, &gen, sizeof(gen)); wp = sizeof(gen); /* * Now push out all the devices. */ for (i = 0; (nds != NULL) && (i < num_devs); nds = STAILQ_NEXT(nds, dev_links), i++) { if (readkmem(kd, (long)nds, &ds, sizeof(ds)) == -1) { free(rv); return(NULL); } nds = &ds; rv = (char *)reallocf(rv, sizeof(gen) + sizeof(ds) * (i + 1)); if (rv == NULL) { snprintf(devstat_errbuf, sizeof(devstat_errbuf), "%s: out of memory (malloc failed)", __func__); return(NULL); } memcpy(rv + wp, &ds, sizeof(ds)); wp += sizeof(ds); } return(rv); }