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.
35 #define READ_BUF_SIZE 50
38 /* For Erik's nifty devps device driver */
39 #ifdef BB_FEATURE_USE_DEVPS_PATCH
40 #include <linux/devps.h>
44 * This finds the pid of the specified process,
45 * by using the /dev/ps device driver.
47 * Returns a list of all matching PIDs
49 extern pid_t* find_pid_by_name( char* pidName)
52 char device[] = "/dev/ps";
54 pid_t* pid_array = NULL;
58 fd = open(device, O_RDONLY);
60 perror_msg_and_die("open failed for `%s'", device);
62 /* Find out how many processes there are */
63 if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
64 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
66 /* Allocate some memory -- grab a few extras just in case
67 * some new processes start up while we wait. The kernel will
68 * just ignore any extras if we give it too many, and will trunc.
69 * the list if we give it too few. */
70 pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
71 pid_array[0] = num_pids+10;
73 /* Now grab the pid list */
74 if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
75 perror_msg_and_die("\nDEVPS_GET_PID_LIST");
77 /* Now search for a match */
78 for (i=1, j=0; i<pid_array[0] ; i++) {
82 info.pid = pid_array[i];
83 if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
84 perror_msg_and_die("\nDEVPS_GET_PID_INFO");
86 /* Make sure we only match on the process name */
87 p=info.command_line+1;
88 while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) {
94 if ((strstr(info.command_line, pidName) != NULL)
95 && (strlen(pidName) == strlen(info.command_line))) {
96 pidList=xrealloc( pidList, sizeof(pid_t) * (j+2));
97 pidList[j++]=info.pid;
108 perror_msg_and_die("close failed for `%s'", device);
113 #else /* BB_FEATURE_USE_DEVPS_PATCH */
115 /* find_pid_by_name()
117 * This finds the pid of the specified process.
118 * Currently, it's implemented by rummaging through
119 * the proc filesystem.
121 * Returns a list of all matching PIDs
123 extern pid_t* find_pid_by_name( char* pidName)
130 dir = opendir("/proc");
132 perror_msg_and_die("Cannot open /proc");
134 while ((next = readdir(dir)) != NULL) {
136 char filename[READ_BUF_SIZE];
137 char buffer[READ_BUF_SIZE];
138 char name[READ_BUF_SIZE];
140 /* Must skip ".." since that is outside /proc */
141 if (strcmp(next->d_name, "..") == 0)
144 /* If it isn't a number, we don't want it */
145 if (!isdigit(*next->d_name))
148 sprintf(filename, "/proc/%s/status", next->d_name);
149 if (! (status = fopen(filename, "r")) ) {
152 if (fgets(buffer, READ_BUF_SIZE-1, status) == NULL) {
158 /* Buffer should contain a string like "Name: binary_name" */
159 sscanf(buffer, "%*s %s", name);
160 if (strcmp(name, pidName) == 0) {
161 pidList=xrealloc( pidList, sizeof(pid_t) * (i+2));
162 pidList[i++]=strtol(next->d_name, NULL, 0);
169 /* If we found nothing, guess PID 1 and call it good */
170 pidList=xrealloc( pidList, sizeof(pid_t));
175 #endif /* BB_FEATURE_USE_DEVPS_PATCH */
180 c-file-style: "linux"