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/****************************************************************************
* bfs *
* Copyright (C) 2015-2019 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
#include "cmdline.h"
#include "util.h"
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/**
* Make sure the standard streams std{in,out,err} are open. If they are not,
* future open() calls may use those file descriptors, and std{in,out,err} will
* use them unintentionally.
*/
static int open_std_streams(void) {
#ifdef O_PATH
const int inflags = O_PATH, outflags = O_PATH;
#else
// These are intentionally backwards so that bfs >&- still fails with EBADF
const int inflags = O_WRONLY, outflags = O_RDONLY;
#endif
if (!isopen(STDERR_FILENO) && redirect(STDERR_FILENO, "/dev/null", outflags) < 0) {
return -1;
}
if (!isopen(STDOUT_FILENO) && redirect(STDOUT_FILENO, "/dev/null", outflags) < 0) {
perror("redirect()");
return -1;
}
if (!isopen(STDIN_FILENO) && redirect(STDIN_FILENO, "/dev/null", inflags) < 0) {
perror("redirect()");
return -1;
}
return 0;
}
/**
* bfs entry point.
*/
int main(int argc, char *argv[]) {
int ret = EXIT_FAILURE;
// Make sure the standard streams are open
if (open_std_streams() != 0) {
goto done;
}
// Use the system locale instead of "C"
setlocale(LC_ALL, "");
struct cmdline *cmdline = parse_cmdline(argc, argv);
if (cmdline) {
ret = eval_cmdline(cmdline);
}
if (free_cmdline(cmdline) != 0 && ret == EXIT_SUCCESS) {
ret = EXIT_FAILURE;
}
done:
return ret;
}
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