mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2015, 2016.
|
|
|
|
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 3 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, see <http://www.gnu.org/licenses/>.
|
|
|
|
execute.h
|
|
Template for common execvp use cases.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "execute.h"
|
|
|
|
int execute(const char* const* argv, const char* flags, ...)
|
|
{
|
|
bool _exit_instead = false;
|
|
bool exit_on_failure = false;
|
|
bool foreground = false;
|
|
bool gid_set = false;
|
|
bool raw_exit_code = false;
|
|
bool uid_set = false;
|
|
bool quiet = false;
|
|
bool quiet_stderr = false;
|
|
gid_t gid = 0;
|
|
uid_t uid = 0;
|
|
va_list ap;
|
|
va_start(ap, flags);
|
|
for ( size_t i = 0; flags[i]; i++ )
|
|
{
|
|
switch ( flags[i] )
|
|
{
|
|
case '_': _exit_instead = true; break;
|
|
case 'e': exit_on_failure = true; break;
|
|
case 'f': foreground = true; break;
|
|
case 'g': gid_set = true; gid = va_arg(ap, gid_t); break;
|
|
case 'r': raw_exit_code = true; break;
|
|
case 'u': uid_set = true; uid = va_arg(ap, uid_t); break;
|
|
case 'q': quiet = true; break;
|
|
case 'Q': quiet_stderr = true; break;
|
|
}
|
|
}
|
|
va_end(ap);
|
|
sigset_t oldset, sigttou;
|
|
if ( foreground )
|
|
{
|
|
sigemptyset(&sigttou);
|
|
sigaddset(&sigttou, SIGTTOU);
|
|
}
|
|
pid_t child_pid = fork();
|
|
if ( child_pid < 0 )
|
|
{
|
|
warn("fork");
|
|
if ( exit_on_failure )
|
|
(_exit_instead ? _exit : exit)(2);
|
|
return -1;
|
|
}
|
|
if ( child_pid == 0 )
|
|
{
|
|
if ( gid_set )
|
|
{
|
|
setegid(gid);
|
|
setgid(gid);
|
|
}
|
|
if ( uid_set )
|
|
{
|
|
seteuid(uid);
|
|
setuid(uid);
|
|
}
|
|
if ( foreground )
|
|
{
|
|
setpgid(0, 0);
|
|
sigprocmask(SIG_BLOCK, &sigttou, &oldset);
|
|
tcsetpgrp(0, getpgid(0));
|
|
sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
}
|
|
if ( quiet )
|
|
{
|
|
close(1);
|
|
open("/dev/null", O_WRONLY);
|
|
}
|
|
if ( quiet_stderr )
|
|
{
|
|
close(2);
|
|
open("/dev/null", O_WRONLY);
|
|
}
|
|
execvp(argv[0], (char* const*) argv);
|
|
warn("%s", argv[0]);
|
|
_exit(127);
|
|
}
|
|
int code;
|
|
waitpid(child_pid, &code, 0);
|
|
if ( foreground )
|
|
{
|
|
sigprocmask(SIG_BLOCK, &sigttou, &oldset);
|
|
tcsetpgrp(0, getpgid(0));
|
|
sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
}
|
|
if ( exit_on_failure )
|
|
{
|
|
if ( !WIFEXITED(code) || WEXITSTATUS(code) != 0 )
|
|
(_exit_instead ? _exit : exit)(2);
|
|
}
|
|
int exit_status;
|
|
if ( WIFEXITED(code) )
|
|
exit_status = WEXITSTATUS(code);
|
|
else
|
|
exit_status = 128 + WTERMSIG(code);
|
|
return raw_exit_code ? code : exit_status;
|
|
}
|