busybox/libbb/find_pid_by_name.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "libbb.h"

/* find_pid_by_name()
 *
 *  Modified by Vladimir Oleynik for use with libbb/procps.c
 *  This finds the pid of the specified process.
 *  Currently, it's implemented by rummaging through
 *  the proc filesystem.
 *
 *  Returns a list of all matching PIDs
 *  It is the caller's duty to free the returned pidlist.
 */
pid_t* find_pid_by_name(const char* procName)
{
	pid_t* pidList;
	int i = 0;
	procps_status_t* p = NULL;

	pidList = xmalloc(sizeof(*pidList));
	while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_COMM))) {
		if (strncmp(p->comm, procName, sizeof(p->comm)-1) == 0) {
			pidList = xrealloc(pidList, sizeof(*pidList) * (i+2));
			pidList[i++] = p->pid;
		}
	}

	pidList[i] = 0;
	return pidList;
}

pid_t *pidlist_reverse(pid_t *pidList)
{
	int i = 0;
	while (pidList[i])
		i++;
	if (--i >= 0) {
		pid_t k;
		int j;
		for (j = 0; i > j; i--, j++) {
			k = pidList[i];
			pidList[i] = pidList[j];
			pidList[j] = k;
		}
	}
	return pidList;
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Utility routines.
4			*
5			* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6			*
7			* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
8			*/
9
10			#include "libbb.h"
11
12			/* find_pid_by_name()
13			*
14			* Modified by Vladimir Oleynik for use with libbb/procps.c
15			* This finds the pid of the specified process.
16			* Currently, it's implemented by rummaging through
17			* the proc filesystem.
18			*
19			* Returns a list of all matching PIDs
20			* It is the caller's duty to free the returned pidlist.
21			*/
22			pid_t* find_pid_by_name(const char* procName)
23			{
24			pid_t* pidList;
25			int i = 0;
26			procps_status_t* p = NULL;
27
28			pidList = xmalloc(sizeof(*pidList));
29			while ((p = procps_scan(p, PSSCAN_PID\|PSSCAN_COMM))) {
30			if (strncmp(p->comm, procName, sizeof(p->comm)-1) == 0) {
31			pidList = xrealloc(pidList, sizeof(pidList) (i+2));
32			pidList[i++] = p->pid;
33			}
34			}
35
36			pidList[i] = 0;
37			return pidList;
38			}
39
40			pid_t pidlist_reverse(pid_t pidList)
41			{
42			int i = 0;
43			while (pidList[i])
44			i++;
45			if (--i >= 0) {
46			pid_t k;
47			int j;
48			for (j = 0; i > j; i--, j++) {
49			k = pidList[i];
50			pidList[i] = pidList[j];
51			pidList[j] = k;
52			}
53			}
54			return pidList;
55			}