1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) tons of folks. Tracking down who wrote what
6 * isn't something I'm going to worry about... If you wrote something
7 * here, please feel free to acknowledge your work.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
24 * Permission has been granted to redistribute this code under the GPL.
36 /* For Erik's nifty devps device driver */
37 #ifdef BB_FEATURE_USE_DEVPS_PATCH
38 #include <linux/devps.h>
42 * This finds the pid of the specified process,
43 * by using the /dev/ps device driver.
45 * Returns a list of all matching PIDs
47 extern pid_t* find_pid_by_name( char* pidName)
50 char device[] = "/dev/ps";
52 pid_t* pid_array = NULL;
56 fd = open(device, O_RDONLY);
58 perror_msg_and_die("open failed for `%s'", device);
60 /* Find out how many processes there are */
61 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
62 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
64 /* Allocate some memory -- grab a few extras just in case
65 * some new processes start up while we wait. The kernel will
66 * just ignore any extras if we give it too many, and will trunc.
67 * the list if we give it too few. */
68 pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
69 pid_array[0] = num_pids+10;
71 /* Now grab the pid list */
72 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
73 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
75 /* Now search for a match */
76 for (i=1, j=0; i<pid_array[0] ; i++) {
80 info.pid = pid_array[i];
81 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
82 perror_msg_and_die("\nDEVPS_GET_PID_INFO");
84 /* Make sure we only match on the process name */
85 p=info.command_line+1;
86 while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) {
92 if ((strstr(info.command_line, pidName) != NULL)
93 && (strlen(pidName) == strlen(info.command_line))) {
94 pidList=xrealloc( pidList, sizeof(pid_t) * (j+2));
95 pidList[j++]=info.pid;
106 perror_msg_and_die("close failed for `%s'", device);
111 #else /* BB_FEATURE_USE_DEVPS_PATCH */
113 /* find_pid_by_name()
115 * This finds the pid of the specified process.
116 * Currently, it's implemented by rummaging through
117 * the proc filesystem.
119 * Returns a list of all matching PIDs
121 extern pid_t* find_pid_by_name( char* pidName)
128 dir = opendir("/proc");
130 perror_msg_and_die("Cannot open /proc");
132 while ((next = readdir(dir)) != NULL) {
137 /* If it isn't a number, we don't want it */
138 if (!isdigit(*next->d_name))
141 sprintf(filename, "/proc/%s/cmdline", next->d_name);
142 status = fopen(filename, "r");
146 fgets(buffer, 256, status);
149 if (strstr(get_last_path_component(buffer), pidName) != NULL) {
150 pidList=xrealloc( pidList, sizeof(pid_t) * (i+2));
151 pidList[i++]=strtol(next->d_name, NULL, 0);
159 #endif /* BB_FEATURE_USE_DEVPS_PATCH */
164 c-file-style: "linux"