X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Ffind_pid_by_name.c;h=05f7f968f872cfb443166ea9a03bd7d8e3f49123;hb=35fb51272863c8723a40e59d2024c7f4c9ec8946;hp=7f39dd41c8d66452afa039c6fc0311205f1a2b6d;hpb=8e75f6daa6d365b4271c5f9b27b55898835f51cd;p=oweals%2Fbusybox.git diff --git a/libbb/find_pid_by_name.c b/libbb/find_pid_by_name.c index 7f39dd41c..05f7f968f 100644 --- a/libbb/find_pid_by_name.c +++ b/libbb/find_pid_by_name.c @@ -2,198 +2,54 @@ /* * Utility routines. * - * Copyright (C) tons of folks. Tracking down who wrote what - * isn't something I'm going to worry about... If you wrote something - * here, please feel free to acknowledge your work. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Based in part on code from sash, Copyright (c) 1999 by David I. Bell - * Permission has been granted to redistribute this code under the GPL. + * Copyright (C) 1999-2004 by Erik Andersen * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ -#include -#include -#include -#include -#include #include "libbb.h" -#define READ_BUF_SIZE 50 - - -/* For Erik's nifty devps device driver */ -#ifdef BB_FEATURE_USE_DEVPS_PATCH -#include - /* find_pid_by_name() - * - * This finds the pid of the specified process, - * by using the /dev/ps device driver. + * + * 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. */ -extern pid_t* find_pid_by_name( char* pidName) +pid_t* find_pid_by_name(const char* procName) { - int fd, i, j; - char device[] = "/dev/ps"; - pid_t num_pids; - pid_t* pid_array = NULL; - pid_t* pidList=NULL; - - /* open device */ - fd = open(device, O_RDONLY); - if (fd < 0) - perror_msg_and_die("open failed for `%s'", device); - - /* Find out how many processes there are */ - if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0) - perror_msg_and_die("\nDEVPS_GET_PID_LIST"); - - /* Allocate some memory -- grab a few extras just in case - * some new processes start up while we wait. The kernel will - * just ignore any extras if we give it too many, and will trunc. - * the list if we give it too few. */ - pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t)); - pid_array[0] = num_pids+10; - - /* Now grab the pid list */ - if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0) - perror_msg_and_die("\nDEVPS_GET_PID_LIST"); - - /* Now search for a match */ - for (i=1, j=0; ishort_cmd, procName, COMM_LEN-1) == 0) { + pidList = xrealloc(pidList, sizeof(*pidList) * (i+2)); + pidList[i++] = p->pid; } } - if (pidList) { - pidList[j]=0; - } else if ( strcmp(pidName, "init")==0) { - /* If we found nothing and they were trying to kill "init", - * guess PID 1 and call it good... Perhaps we should simply - * exit if /proc isn't mounted, but this will do for now. */ - pidList=xrealloc( pidList, sizeof(pid_t)); - pidList[0]=1; - } else { - pidList=xrealloc( pidList, sizeof(pid_t)); - pidList[0]=-1; - } - - /* Free memory */ - free( pid_array); - - /* close device */ - if (close (fd) != 0) - perror_msg_and_die("close failed for `%s'", device); + pidList[i] = 0; return pidList; } -#else /* BB_FEATURE_USE_DEVPS_PATCH */ - -/* find_pid_by_name() - * - * 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 - */ -extern pid_t* find_pid_by_name( char* pidName) +pid_t *pidlist_reverse(pid_t *pidList) { - DIR *dir; - struct dirent *next; - pid_t* pidList=NULL; - int i=0; - - dir = opendir("/proc"); - if (!dir) - perror_msg_and_die("Cannot open /proc"); - - while ((next = readdir(dir)) != NULL) { - FILE *status; - char filename[READ_BUF_SIZE]; - char buffer[READ_BUF_SIZE]; - char name[READ_BUF_SIZE]; - - /* Must skip ".." since that is outside /proc */ - if (strcmp(next->d_name, "..") == 0) - continue; - - /* If it isn't a number, we don't want it */ - if (!isdigit(*next->d_name)) - continue; - - sprintf(filename, "/proc/%s/status", next->d_name); - if (! (status = fopen(filename, "r")) ) { - continue; - } - if (fgets(buffer, READ_BUF_SIZE-1, status) == NULL) { - fclose(status); - continue; - } - fclose(status); - - /* Buffer should contain a string like "Name: binary_name" */ - sscanf(buffer, "%*s %s", name); - if (strcmp(name, pidName) == 0) { - pidList=xrealloc( pidList, sizeof(pid_t) * (i+2)); - pidList[i++]=strtol(next->d_name, NULL, 0); + 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; } } - - if (pidList) - pidList[i]=0; - else if ( strcmp(pidName, "init")==0) { - /* If we found nothing and they were trying to kill "init", - * guess PID 1 and call it good... Perhaps we should simply - * exit if /proc isn't mounted, but this will do for now. */ - pidList=xrealloc( pidList, sizeof(pid_t)); - pidList[0]=1; - } else { - pidList=xrealloc( pidList, sizeof(pid_t)); - pidList[0]=-1; - } return pidList; } -#endif /* BB_FEATURE_USE_DEVPS_PATCH */ - -/* END CODE */ -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/