/* vi: set sw=4 ts=4: *//* * Utility routines. * * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org> * * 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 */#include <stdio.h>#include <ctype.h>#include <string.h>#include <dirent.h>#include <stdlib.h>#include "libbb.h"#define READ_BUF_SIZE	50/* For Erik's nifty devps device driver */#ifdef BB_FEATURE_USE_DEVPS_PATCH#include <linux/devps.h> /* find_pid_by_name() *   *  This finds the pid of the specified process, *  by using the /dev/ps device driver. * *  Returns a list of all matching PIDs */extern long* find_pid_by_name( char* pidName){	int fd, i, j;	char device[] = "/dev/ps";	pid_t num_pids;	pid_t* pid_array = NULL;	long* 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; i<pid_array[0] ; i++) {		char* p;		struct pid_info info;	    info.pid = pid_array[i];	    if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)			perror_msg_and_die("\nDEVPS_GET_PID_INFO");		/* Make sure we only match on the process name */		p=info.command_line+1;		while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) { 			(p)++;		}		if (isspace(*(p)))				*p='\0';		if ((strstr(info.command_line, pidName) != NULL)				&& (strlen(pidName) == strlen(info.command_line))) {			pidList=xrealloc( pidList, sizeof(long) * (j+2));			pidList[j++]=info.pid;		}	}	if (pidList) {		pidList[j]=0;	} else {		pidList=xrealloc( pidList, sizeof(long));		pidList[0]=-1;	}	/* Free memory */	free(pid_array);	/* close device */	if (close (fd) != 0) 		perror_msg_and_die("close failed for `%s'", device);	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 long* find_pid_by_name( char* pidName){	DIR *dir;	struct dirent *next;	long* 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(long) * (i+2));			pidList[i++]=strtol(next->d_name, NULL, 0);		}	}	if (pidList) {		pidList[i]=0;	} else {		pidList=xrealloc( pidList, sizeof(long));		pidList[0]=-1;	}	return pidList;}#endif							/* BB_FEATURE_USE_DEVPS_PATCH *//* END CODE *//*Local Variables:c-file-style: "linux"c-basic-offset: 4tab-width: 4End:*/