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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <fcntl.h> 30 #include <string.h> 31 #include <errno.h> 32 #include <sys/types.h> 33 #include <signal.h> 34 #include <libproc.h> 35 36 static int stop(char *); 37 static int lwpstop(int *, const lwpstatus_t *, const lwpsinfo_t *); 38 39 static char *command; 40 static const char *lwps; 41 static struct ps_prochandle *P; 42 43 int 44 main(int argc, char **argv) 45 { 46 int rc = 0; 47 48 if ((command = strrchr(argv[0], '/')) != NULL) 49 command++; 50 else 51 command = argv[0]; 52 53 if (argc <= 1) { 54 (void) fprintf(stderr, "usage:\t%s pid[/lwps] ...\n", command); 55 (void) fprintf(stderr, 56 " (stop processes or lwps with /proc request)\n"); 57 return (2); 58 } 59 60 while (--argc > 0) 61 rc += stop(*++argv); 62 63 return (rc); 64 } 65 66 static int 67 stop(char *arg) 68 { 69 int gcode; 70 int rc = 0; 71 72 if ((P = proc_arg_xgrab(arg, NULL, PR_ARG_PIDS, PGRAB_RETAIN | 73 PGRAB_NOSTOP | PGRAB_FORCE, &gcode, &lwps)) == NULL) { 74 (void) fprintf(stderr, "%s: cannot control %s: %s\n", 75 command, arg, Pgrab_error(gcode)); 76 return (1); 77 } else if (lwps != NULL) { 78 /* 79 * The user has provided an lwp specification. Let's consider 80 * the lwp specification as a mask. We iterate over all lwps in 81 * the process and stop every lwp, which matches the mask. If 82 * there is no lwp matching the mask or an error occured during 83 * the iteration, set the return code to 1 as indication of an 84 * error. 85 */ 86 int lwpcount = 0; 87 88 (void) Plwp_iter_all(P, (proc_lwp_all_f *)lwpstop, &lwpcount); 89 if (lwpcount == 0) { 90 (void) fprintf(stderr, "%s: cannot control %s:" 91 " no matching LWPs found\n", command, arg); 92 rc = 1; 93 } else if (lwpcount == -1) 94 rc = 1; 95 } else { 96 (void) Pdstop(P); /* Stop the process. */ 97 } 98 99 /* 100 * Prelease could change the tracing flags, use Pfree and unset 101 * run-on-last-close flag to prevent the process being set running 102 * after detaching from it. 103 */ 104 (void) Punsetflags(P, PR_RLC); 105 Pfree(P); 106 return (rc); 107 } 108 109 /* ARGSUSED */ 110 static int 111 lwpstop(int *lwpcount, const lwpstatus_t *status, const lwpsinfo_t *info) 112 { 113 struct ps_lwphandle *L; 114 int gcode; 115 116 if (proc_lwp_in_set(lwps, info->pr_lwpid)) { 117 /* 118 * There is a race between the callback from the iterator and 119 * grabbing of the lwp. If the lwp has already exited, Lgrab 120 * will return the error code G_NOPROC. It's not a real error, 121 * only if there is no lwp matching the specification. 122 */ 123 if ((L = Lgrab(P, info->pr_lwpid, &gcode)) != NULL) { 124 (void) Ldstop(L); 125 Lfree(L); 126 if (*lwpcount >= 0) 127 (*lwpcount)++; 128 } else if (gcode != G_NOPROC) { 129 (void) fprintf(stderr, "%s: cannot control %d/%d: %s\n", 130 command, (int)Pstatus(P)->pr_pid, 131 (int)info->pr_lwpid, Lgrab_error(gcode)); 132 *lwpcount = -1; 133 } 134 } 135 return (0); 136 } 137