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/* xsystem.c - system(3) with error messages
Carl D. Worth
Copyright (C) 2001 University of Southern California
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, 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.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "xsystem.h"
#include "libbb/libbb.h"
/* Like system(3), but with error messages printed if the fork fails
or if the child process dies due to an uncaught signal. Also, the
return value is a bit simpler:
-1 if there was any problem
Otherwise, the 8-bit return value of the program ala WEXITSTATUS
as defined in <sys/wait.h>.
*/
int
xsystem(const char *argv[])
{
int status;
pid_t pid;
pid = vfork();
switch (pid) {
case -1:
opkg_perror(ERROR, "%s: vfork", argv[0]);
return -1;
case 0:
/* child */
execvp(argv[0], (char*const*)argv);
_exit(-1);
default:
/* parent */
break;
}
if (waitpid(pid, &status, 0) == -1) {
opkg_perror(ERROR, "%s: waitpid", argv[0]);
return -1;
}
if (WIFSIGNALED(status)) {
opkg_msg(ERROR, "%s: Child killed by signal %d.\n",
argv[0], WTERMSIG(status));
return -1;
}
if (!WIFEXITED(status)) {
/* shouldn't happen */
opkg_msg(ERROR, "%s: Your system is broken: got status %d "
"from waitpid.\n", argv[0], status);
return -1;
}
return WEXITSTATUS(status);
}
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