132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2015, 2016.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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execute.h
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Template for common execvp use cases.
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*******************************************************************************/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "execute.h"
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int execute(const char* const* argv, const char* flags, ...)
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{
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bool _exit_instead = false;
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bool exit_on_failure = false;
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bool foreground = false;
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bool gid_set = false;
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bool raw_exit_code = false;
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bool uid_set = false;
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bool quiet = false;
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bool quiet_stderr = false;
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gid_t gid = 0;
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uid_t uid = 0;
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va_list ap;
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va_start(ap, flags);
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for ( size_t i = 0; flags[i]; i++ )
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{
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switch ( flags[i] )
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{
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case '_': _exit_instead = true; break;
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case 'e': exit_on_failure = true; break;
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case 'f': foreground = true; break;
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case 'g': gid_set = true; gid = va_arg(ap, gid_t); break;
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case 'r': raw_exit_code = true; break;
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case 'u': uid_set = true; uid = va_arg(ap, uid_t); break;
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case 'q': quiet = true; break;
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case 'Q': quiet_stderr = true; break;
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}
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}
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va_end(ap);
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sigset_t oldset, sigttou;
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if ( foreground )
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{
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sigemptyset(&sigttou);
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sigaddset(&sigttou, SIGTTOU);
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}
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pid_t child_pid = fork();
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if ( child_pid < 0 )
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{
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warn("fork");
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if ( exit_on_failure )
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(_exit_instead ? _exit : exit)(2);
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return -1;
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}
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if ( child_pid == 0 )
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{
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if ( gid_set )
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{
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setegid(gid);
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setgid(gid);
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}
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if ( uid_set )
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{
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seteuid(uid);
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setuid(uid);
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}
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if ( foreground )
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{
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setpgid(0, 0);
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sigprocmask(SIG_BLOCK, &sigttou, &oldset);
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tcsetpgrp(0, getpgid(0));
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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}
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if ( quiet )
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{
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close(1);
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open("/dev/null", O_WRONLY);
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}
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if ( quiet_stderr )
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{
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close(2);
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open("/dev/null", O_WRONLY);
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}
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execvp(argv[0], (char* const*) argv);
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warn("%s", argv[0]);
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_exit(127);
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}
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int code;
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waitpid(child_pid, &code, 0);
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if ( foreground )
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{
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sigprocmask(SIG_BLOCK, &sigttou, &oldset);
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tcsetpgrp(0, getpgid(0));
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sigprocmask(SIG_SETMASK, &oldset, NULL);
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}
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if ( exit_on_failure )
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{
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if ( !WIFEXITED(code) || WEXITSTATUS(code) != 0 )
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(_exit_instead ? _exit : exit)(2);
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}
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int exit_status;
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if ( WIFEXITED(code) )
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exit_status = WEXITSTATUS(code);
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else
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exit_status = 128 + WTERMSIG(code);
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return raw_exit_code ? code : exit_status;
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}
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