kill.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

/* vi: set sw=4 ts=4: */
/*
 * Mini kill/killall implementation for busybox
 *
 * Copyright (C) 1995, 1996 by Bruce Perens <[e-mail]>.
 * Copyright (C) 1999-2002 by Erik Andersen <[e-mail]>
 *
 * 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 <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include "busybox.h"

static const int KILL = 0;
static const int KILLALL = 1;


extern int kill_main(int argc, char **argv)
{
	int whichApp, sig = SIGTERM;
	const char *name;

#ifdef CONFIG_KILLALL
	/* Figure out what we are trying to do here */
	whichApp = (strcmp(applet_name, "killall") == 0)? KILLALL : KILL; 
#else
	whichApp = KILL;
#endif

	argc--;
	argv++;
	/* Parse any options */
	if (argc < 1)
		show_usage();

	while (argc > 0 && **argv == '-') {
		while (*++(*argv)) {
			switch (**argv) {
			case 'l':
				if(argc>1) {
					for(argv++; *argv; argv++) {
						name = u_signal_names(*argv, &sig, -1);
						if(name!=NULL)
							printf("%s\n", name);
					}
				} else {
					int col = 0;
					for(sig=1; sig < NSIG; sig++) {
						name = u_signal_names(0, &sig, 1);
						if(name==NULL)  /* unnamed */
							continue;
						col += printf("%2d) %-16s", sig, name);
						if (col > 60) {
							printf("\n");
							col = 0;
						}
					}
					printf("\n");
				}
				return EXIT_SUCCESS;
			case '-':
				show_usage();
			default:
				name = u_signal_names(*argv, &sig, 0);
				if(name==NULL)
					error_msg_and_die( "bad signal name: %s", *argv);
								argc--;
								argv++;
								goto do_it_now;
							}
			argc--;
			argv++;
		}
	}

  do_it_now:

	if (whichApp == KILL) {
		/* Looks like they want to do a kill. Do that */
		while (--argc >= 0) {
			int pid;

			if (!isdigit(**argv))
				perror_msg_and_die( "Bad PID");
			pid = strtol(*argv, NULL, 0);
			if (kill(pid, sig) != 0) 
				perror_msg_and_die( "Could not kill pid '%d'", pid);
			argv++;
		}
	} 
#ifdef CONFIG_KILLALL
	else {
		int all_found = TRUE;
		pid_t myPid=getpid();
		/* Looks like they want to do a killall.  Do that */
		while (--argc >= 0) {
			long* pidList;

			pidList = find_pid_by_name( *argv);
			if (!pidList || *pidList<=0) {
				all_found = FALSE;
				error_msg_and_die( "%s: no process killed", *argv);
			}

			for(; pidList && *pidList!=0; pidList++) {
				if (*pidList==myPid)
					continue;
				if (kill(*pidList, sig) != 0) 
					perror_msg_and_die( "Could not kill pid '%d'", *pidList);
			}
			/* Note that we don't bother to free the memory
			 * allocated in find_pid_by_name().  It will be freed
			 * upon exit, so we can save a byte or two */
			argv++;
		}
		if (! all_found)
			return EXIT_FAILURE;
	}
#endif

	return EXIT_SUCCESS;
}