2b72262b4f
I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
127 lines
3 KiB
C
127 lines
3 KiB
C
/*
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* Copyright (c) 2015, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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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