mailing list of musl libc

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

int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa, int srcfd, int fd)
{
	if (srcfd < 0 || fd < 0) return EBADF;
	if (FA_CNT_MAX - fa->fa_cnt < 2)
		if (__faexpand(fa, 0) != 0) return ENOMEM;
	fa->fa_ops[fa->fa_cnt++] = fd;
	fa->fa_ops[fa->fa_cnt++] = srcfd;
	return 0;
}