/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2018  Z. Gilboa                            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#ifndef SLIBTOOL_SPAWN_IMPL_H

#define SLIBTOOL_SPAWN_IMPL_H

#include <limits.h>

#include <unistd.h>

#include <stdlib.h>

#include <stdbool.h>

#include <errno.h>

#include <sys/wait.h>

#ifndef PATH_MAX

#define PATH_MAX (_XOPEN_PATH_MAX < 4096) ? 4096 : _XOPEN_PATH_MAX

#endif

#ifndef SLBT_USE_FORK

#ifndef SLBT_USE_VFORK

#ifndef SLBT_USE_POSIX_SPAWN

#define SLBT_USE_POSIX_SPAWN

#endif

#endif

#endif

#ifdef  SLBT_USE_POSIX_SPAWN

#include <spawn.h>

#endif

extern char ** environ;

static inline int slbt_spawn(

	struct slbt_exec_ctx *	ectx,

	bool			fwait)

{

	pid_t	pid;

#ifdef SLBT_USE_POSIX_SPAWN

	if (posix_spawnp(

			&pid,

			ectx->program,

			0,0,

			ectx->argv,

			ectx->envp ? ectx->envp : environ))

		pid = -1;

#else

#ifdef SLBT_USE_FORK

	pid = fork();

#else

	pid = vfork();

#endif

#endif

	if (pid < 0) {

		ectx->pid      = pid;

		ectx->exitcode = errno;

		return -1;

	}

	if (pid == 0) {

		execvp(

			ectx->program,

			ectx->argv);

		_exit(errno);

	}

	errno     = 0;

	ectx->pid = pid;

	if (fwait)

		return waitpid(

			pid,

			&ectx->exitcode,

			0);

	return 0;

}

#endif