102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2017, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* @file tor_runner.c
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* @brief Experimental module to emulate tor_run_main() API with fork+exec
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*
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* The functions here are meant to allow the application developer to
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* use the tor_run_main() API without having to care whether Tor is
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* running in-process or out-of-process. For in-process usage, the
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* developer can link Tor as a library and call tor_run_main(); for
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* out-of-process usage, the developer can link this library instead.
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*
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* This interface is EXPERIMENTAL; please let us know if you would like
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* to depend on it. We don't know yet whether it will be reliable in
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* practice.
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*/
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/* NOTE: This module is supposed to work without the standard Tor utility
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* functions. Don't add more dependencies!
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*/
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#include "tor_api.h"
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#include "tor_api_internal.h"
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#include "orconfig.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#ifndef __GNUC__
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#define __attribute__(x)
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#endif
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static void child(const tor_main_configuration_t *cfg)
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__attribute__((noreturn));
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int
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tor_run_main(const tor_main_configuration_t *cfg)
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{
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pid_t pid = fork();
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if (pid == 0) {
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child(cfg);
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exit(0); /* Unreachable */
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}
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pid_t stopped_pid;
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int status = 0;
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do {
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stopped_pid = waitpid(pid, &status, 0);
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} while (stopped_pid == -1);
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/* Note: these return values are not documented. No return value is
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* documented! */
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if (stopped_pid != pid) {
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return -99999;
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}
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if (WIFSTOPPED(status)) {
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return WEXITSTATUS(status);
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}
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if (WIFSIGNALED(status)) {
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return -WTERMSIG(status);
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}
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return -999988;
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}
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/* circumlocution to avoid getting warned about calling calloc instead of
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* tor_calloc. */
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#define real_calloc calloc
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static void
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child(const tor_main_configuration_t *cfg)
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{
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/* XXXX Close unused file descriptors. */
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char **args = real_calloc(cfg->argc+1, sizeof(char *));
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memcpy(args, cfg->argv, cfg->argc * sizeof(char *));
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args[cfg->argc] = NULL;
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int rv = execv(BINDIR "/tor", args);
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if (rv < 0) {
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exit(254);
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} else {
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abort(); /* Unreachable */
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}
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}
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