+diff --git a/src/posix_spawn.c b/src/posix_spawn.c
+new file mode 100644
+index 0000000..18ceb06
+--- /dev/null
++++ b/src/posix_spawn.c
+@@ -0,0 +1,156 @@
++/*
++ * dhcpcd - DHCP client daemon
++ * Copyright (c) 2006-2012 Roy Marples <roy@marples.name>
++ * All rights reserved
++
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ * notice, this list of conditions and the following disclaimer.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
++ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
++ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
++ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
++ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
++ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
++ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
++ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
++ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
++ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
++ * SUCH DAMAGE.
++ */
++
++/* This implementation of posix_spawn is only suitable for the needs of dhcpcd
++ * but it could easily be extended to other applications. */
++
++#include <sys/types.h>
++#include <sys/wait.h>
++
++#include <errno.h>
++#include <signal.h>
++#include <stdlib.h>
++#include <string.h>
++#include <unistd.h>
++
++#include "posix_spawn.h"
++
++#ifndef _NSIG
++#ifdef _SIG_MAXSIG
++#define _NSIG _SIG_MAXSIG + 1
++#else
++/* Guess */
++#define _NSIG SIGPWR + 1
++#endif
++#endif
++
++extern char **environ;
++
++static int
++posix_spawnattr_handle(const posix_spawnattr_t *attrp)
++{
++ struct sigaction sa;
++ int i;
++
++ if (attrp->posix_attr_flags & POSIX_SPAWN_SETSIGMASK)
++ sigprocmask(SIG_SETMASK, &attrp->posix_attr_sigmask, NULL);
++
++ if (attrp->posix_attr_flags & POSIX_SPAWN_SETSIGDEF) {
++ memset(&sa, 0, sizeof(sa));
++ sa.sa_handler = SIG_DFL;
++ for (i = 1; i < _NSIG; i++) {
++ if (sigismember(&attrp->posix_attr_sigdefault, i)) {
++ if (sigaction(i, &sa, NULL) == -1)
++ return -1;
++ }
++ }
++ }
++
++ return 0;
++}
++
++inline static int
++is_vfork_safe(short int flags)
++{
++ return !(flags & (POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK));
++}
++
++int
++posix_spawn(pid_t *pid, const char *path,
++ const posix_spawn_file_actions_t *file_actions,
++ const posix_spawnattr_t *attrp,
++ char *const argv[], char *const envp[])
++{
++ short int flags;
++ pid_t p;
++ volatile int error;
++
++ error = 0;
++ flags = attrp ? attrp->posix_attr_flags : 0;
++ if (file_actions == NULL && is_vfork_safe(flags))
++ p = vfork();
++ else
++#ifdef THERE_IS_NO_FORK
++ return ENOSYS;
++#else
++ p = fork();
++#endif
++ switch (p) {
++ case -1:
++ return errno;
++ case 0:
++ if (attrp) {
++ error = posix_spawnattr_handle(attrp);
++ if (error)
++ _exit(127);
++ }
++ execve(path, argv, envp);
++ error = errno;
++ _exit(127);
++ default:
++ if (error != 0)
++ waitpid(p, NULL, WNOHANG);
++ else if (pid != NULL)
++ *pid = p;
++ return error;
++ }
++}
++
++int
++posix_spawnattr_init(posix_spawnattr_t *attr)
++{
++
++ memset(attr, 0, sizeof(*attr));
++ attr->posix_attr_flags = 0;
++ sigprocmask(0, NULL, &attr->posix_attr_sigmask);
++ sigemptyset(&attr->posix_attr_sigdefault);
++ return 0;
++}
++
++int
++posix_spawnattr_setflags(posix_spawnattr_t *attr, short flags)
++{
++
++ attr->posix_attr_flags = flags;
++ return 0;
++}
++
++int
++posix_spawnattr_setsigmask(posix_spawnattr_t *attr, const sigset_t *sigmask)
++{
++
++ attr->posix_attr_sigmask = *sigmask;
++ return 0;
++}
++
++int
++posix_spawnattr_setsigdefault(posix_spawnattr_t *attr, const sigset_t *sigmask)
++{
++
++ attr->posix_attr_sigdefault = *sigmask;
++ return 0;
++}
~mdw / termux-packages / commitdiff