#include <errno.h>
#include <stdarg.h>

#define LD_EXTERN extern __attribute__((weak))
LD_EXTERN int ld_execl(const char *path, const char *arg1, va_list arg);
LD_EXTERN int ld_execlp(const char *file, const char *arg1, va_list arg);
LD_EXTERN int ld_execle(const char *path, const char *arg1, va_list arg);
LD_EXTERN int ld_execv(const char *path, char *const argv[]);
LD_EXTERN int ld_execvp(const char *file, char *const argv[]);
LD_EXTERN int ld_execvpe(
	const char *file,
	char *const argv[],
	char *const envp[]);

int execl(const char *path, const char *arg, ...)
{
	va_list arglist;
	va_start(arglist, arg);
	int err = ld_execl(path, arg, arglist);
	va_end(arglist);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}

int execlp(const char *file, const char *arg, ...)
{
	va_list arglist;
	va_start(arglist, arg);
	int err = ld_execlp(file, arg, arglist);
	va_end(arglist);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}

int execle(const char *path, const char *arg, ...)
{
	va_list arglist;
	va_start(arglist, arg);
	int err = ld_execle(path, arg, arglist);
	va_end(arglist);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}

int execv(const char *path, char *const argv[])
{
	int err = ld_execv(path, argv);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}

int execvp(const char *file, char *const argv[])
{
	int err = ld_execvp(file, argv);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}

int execvpe(const char *file, char *const argv[], char *const envp[])
{
	int err = ld_execvpe(file, argv, envp);

	if (err < 0) {
		return __set_errno(-err);
	}

	/* this shouldn't happen */
	return __set_errno(ENOEXEC);
}