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/*********************************************************************
* bfs *
* Copyright (C) 2016 Tavian Barnes <tavianator@tavianator.com> *
* *
* This program is free software. It comes without any warranty, to *
* the extent permitted by applicable law. You can redistribute it *
* and/or modify it under the terms of the Do What The Fuck You Want *
* To Public License, Version 2, as published by Sam Hocevar. See *
* the COPYING file or http://www.wtfpl.net/ for more details. *
*********************************************************************/
#include "util.h"
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
bool isopen(int fd) {
return fcntl(fd, F_GETFD) >= 0 || errno != EBADF;
}
int redirect(int fd, const char *path, int flags, ...) {
close(fd);
mode_t mode = 0;
if (flags & O_CREAT) {
va_list args;
va_start(args, flags);
// Use int rather than mode_t, because va_arg must receive a
// fully-promoted type
mode = va_arg(args, int);
va_end(args);
}
int ret = open(path, flags, mode);
if (ret >= 0 && ret != fd) {
int other = ret;
ret = dup2(other, fd);
if (close(other) != 0) {
ret = -1;
}
}
return ret;
}
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