mailing list of musl libc

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

int posix_spawn_file_actions_addchdir_np(posix_spawn_file_actions_t *restrict fa, const char *restrict path)
{
	size_t len = strlen(path);
	if (faexpand(fa, len + 1) != 0) return ENOMEM;
	fa->__pad[fa->__pad0[0]++] = INT_MAX;
	fa->__pad[fa->__pad0[0]++] = -FDOP_CHDIR;
	memcpy((posix_spawn_file_actions_t *)fa->__actions + 1, path, len + 1);
	return 0;
}