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148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include "libbb.h"
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#define READ_BUF_SIZE 50
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/* For Erik's nifty devps device driver */
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#ifdef CONFIG_FEATURE_USE_DEVPS_PATCH
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#include <linux/devps.h>
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/* find_pid_by_name()
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*
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* This finds the pid of the specified process,
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* by using the /dev/ps device driver.
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*
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* Returns a list of all matching PIDs
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*/
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extern long* find_pid_by_name( const char* pidName)
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{
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int fd, i, j;
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char device[] = "/dev/ps";
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pid_t num_pids;
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pid_t* pid_array = NULL;
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long* pidList=NULL;
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/* open device */
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fd = open(device, O_RDONLY);
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if (fd < 0)
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perror_msg_and_die("open failed for `%s'", device);
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/* Find out how many processes there are */
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if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_LIST");
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/* Allocate some memory -- grab a few extras just in case
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* some new processes start up while we wait. The kernel will
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* just ignore any extras if we give it too many, and will trunc.
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* the list if we give it too few. */
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pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
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pid_array[0] = num_pids+10;
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/* Now grab the pid list */
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if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_LIST");
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/* Now search for a match */
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for (i=1, j=0; i<pid_array[0] ; i++) {
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char* p;
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struct pid_info info;
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info.pid = pid_array[i];
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if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
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perror_msg_and_die("\nDEVPS_GET_PID_INFO");
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/* Make sure we only match on the process name */
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p=info.command_line+1;
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while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) {
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(p)++;
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}
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if (isspace(*(p)))
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*p='\0';
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if ((strstr(info.command_line, pidName) != NULL)
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&& (strlen(pidName) == strlen(info.command_line))) {
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pidList=xrealloc( pidList, sizeof(long) * (j+2));
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pidList[j++]=info.pid;
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}
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}
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if (pidList) {
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pidList[j]=0;
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} else {
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pidList=xrealloc( pidList, sizeof(long));
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pidList[0]=-1;
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}
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/* Free memory */
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free( pid_array);
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/* close device */
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if (close (fd) != 0)
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perror_msg_and_die("close failed for `%s'", device);
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return pidList;
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}
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#else /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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/* find_pid_by_name()
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*
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* Modified by Vladimir Oleynik for use with libbb/procps.c
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* This finds the pid of the specified process.
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* Currently, it's implemented by rummaging through
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* the proc filesystem.
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*
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* Returns a list of all matching PIDs
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*/
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extern long* find_pid_by_name( const char* pidName)
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{
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long* pidList;
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int i=0;
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procps_status_t * p;
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pidList = xmalloc(sizeof(long));
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while ((p = procps_scan(0)) != 0) {
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if (strcmp(p->short_cmd, pidName) == 0) {
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pidList=xrealloc( pidList, sizeof(long) * (i+2));
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pidList[i++]=p->pid;
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}
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}
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pidList[i] = i==0 ? -1 : 0;
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return pidList;
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}
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#endif /* CONFIG_FEATURE_USE_DEVPS_PATCH */
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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