busybox/libbb/find_pid_by_name.c
Denis Vlasenko 35fb512728 PID should be stored in pid_t, not int or long.
find_pid_by_name() was returning 0 or -1 in last array element,
but -1 was never checked. We can use just 0 intead.
2006-11-01 09:16:49 +00:00

56 lines
1.1 KiB
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;
pidList = xmalloc(sizeof(*pidList));
while ((p = procps_scan(0)) != 0) {
if (strncmp(p->short_cmd, procName, COMM_LEN-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;
}