1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1998-1999 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #include <sys/mdb_modapi.h> 28 #include <sys/proc.h> 29 30 /* 31 * Initialize the proc_t walker by either using the given starting address, 32 * or reading the value of the kernel's practive pointer. We also allocate 33 * a proc_t for storage, and save this using the walk_data pointer. 34 */ 35 static int 36 sp_walk_init(mdb_walk_state_t *wsp) 37 { 38 if (wsp->walk_addr == NULL && 39 mdb_readvar(&wsp->walk_addr, "practive") == -1) { 40 mdb_warn("failed to read 'practive'"); 41 return (WALK_ERR); 42 } 43 44 wsp->walk_data = mdb_alloc(sizeof (proc_t), UM_SLEEP); 45 return (WALK_NEXT); 46 } 47 48 /* 49 * At each step, read a proc_t into our private storage, and then invoke 50 * the callback function. We terminate when we reach a NULL p_next pointer. 51 */ 52 static int 53 sp_walk_step(mdb_walk_state_t *wsp) 54 { 55 int status; 56 57 if (wsp->walk_addr == NULL) 58 return (WALK_DONE); 59 60 if (mdb_vread(wsp->walk_data, sizeof (proc_t), wsp->walk_addr) == -1) { 61 mdb_warn("failed to read proc at %p", wsp->walk_addr); 62 return (WALK_DONE); 63 } 64 65 status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data, 66 wsp->walk_cbdata); 67 68 wsp->walk_addr = (uintptr_t)(((proc_t *)wsp->walk_data)->p_next); 69 return (status); 70 } 71 72 /* 73 * The walker's fini function is invoked at the end of each walk. Since we 74 * dynamically allocated a proc_t in sp_walk_init, we must free it now. 75 */ 76 static void 77 sp_walk_fini(mdb_walk_state_t *wsp) 78 { 79 mdb_free(wsp->walk_data, sizeof (proc_t)); 80 } 81 82 static int 83 simple_ps(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 84 { 85 struct pid pid; 86 proc_t p; 87 88 if (argc != 0) 89 return (DCMD_USAGE); 90 91 /* 92 * If no proc_t address was specified on the command line, we can 93 * print out all processes by invoking the walker, using this 94 * dcmd itself as the callback. 95 */ 96 if (!(flags & DCMD_ADDRSPEC)) { 97 if (mdb_walk_dcmd("simple_proc", "simple_ps", 98 argc, argv) == -1) { 99 mdb_warn("failed to walk 'simple_proc'"); 100 return (DCMD_ERR); 101 } 102 return (DCMD_OK); 103 } 104 105 /* 106 * If this is the first invocation of the command, print a nice 107 * header line for the output that will follow. 108 */ 109 if (DCMD_HDRSPEC(flags)) 110 mdb_printf("%5s %s\n", "PID", "COMM"); 111 112 /* 113 * For each process, we just need to read the proc_t struct, read 114 * the pid struct addressed by p_pidp, and then print out the pid 115 * and the command name. 116 */ 117 if (mdb_vread(&p, sizeof (p), addr) == sizeof (p)) { 118 119 if (mdb_vread(&pid, sizeof (pid), 120 (uintptr_t)p.p_pidp) == sizeof (pid)) 121 mdb_printf("%5d %s\n", pid.pid_id, p.p_user.u_comm); 122 else 123 mdb_warn("failed to read struct pid at %p", p.p_pidp); 124 } else 125 mdb_warn("failed to read process at %p", addr); 126 127 return (DCMD_OK); 128 } 129 130 /* 131 * MDB module linkage information: 132 * 133 * We declare a list of structures describing our dcmds, a list of structures 134 * describing our walkers, and a function named _mdb_init to return a pointer 135 * to our module information. 136 */ 137 138 static const mdb_dcmd_t dcmds[] = { 139 { "simple_ps", NULL, "simple process list", simple_ps }, 140 { NULL } 141 }; 142 143 static const mdb_walker_t walkers[] = { 144 { "simple_proc", "walk list of proc_t structures", 145 sp_walk_init, sp_walk_step, sp_walk_fini }, 146 { NULL } 147 }; 148 149 static const mdb_modinfo_t modinfo = { 150 MDB_API_VERSION, dcmds, walkers 151 }; 152 153 const mdb_modinfo_t * 154 _mdb_init(void) 155 { 156 return (&modinfo); 157 } 158