mailing list of musl libc

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 #include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "fdop.h"

int posix_spawn_file_actions_addfchdir_np(posix_spawn_file_actions_t *fa, int fd)
{
	if (fd < 0) return EBADF;
	if (sizeof(fa->__pad)/sizeof(*fa->__pad) - fa->__pad0[0] < 2)
		if (faexpand(fa, 0) != 0) return ENOMEM;
	fa->__pad[fa->__pad0[0]++] = fd;
	fa->__pad[fa->__pad0[0]++] = -FDOP_FCHDIR;
	return 0;
}