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/* test-flock.c: Test advisory open file locks, see flock(2)
Options: <see below>
Copyright (C) 2016-2019 Free Software Foundation, Inc.
Written by Svante Signell <svante.signell@gmail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <error.h>
#include <errno.h>
#include <unistd.h>
#include <sys/file.h>
/* Parse args */
int parse_args (int argc, char **argv, char **file_name,
int *flags, char **flagsc,
int *op, char **opc,
int *sleep_time)
{
int i, tmp;
char *str, *endptr;
if (argc < 2)
error (1, 0, "Usage: %s file [flags] [operation] [sleep_time]\n\
file : file name/device name\n\
flags : r (O_RDONLY) | w (O_WRONLY) | rw (O_RDWR) : [w]\n\
operation : s (LOCK_SH), x (LOCK_EX), u (LOCK_UN),\n\
sn (LOCK_SH | LOCK_UN), xn (LOCK_EX | LOCK_UN) : [s]\n\
sleep_time : st <number> : [st 10]\n",
argv[0]);
*file_name = argv[1];
for (i = 2; i < argc; i++)
{
str = argv[i];
if (strncmp (str, "r", 2) == 0)
{
*flags = O_RDONLY;
*flagsc = "O_RDONLY";
continue;
}
if (strncmp (str, "w", 2) == 0)
{
*flags = O_WRONLY;
*flagsc = "O_WRONLY";
continue;
}
if (strncmp (str, "rw", 2) == 0)
{
*flags = O_RDWR;
*flagsc = "O_RDWR";
continue;
}
if (strncmp (str, "s", 2) == 0)
{
*op = LOCK_SH;
*opc = "LOCK_SH";
continue;
}
if (strncmp (str, "sn", 2) == 0)
{
*op = LOCK_SH | LOCK_NB;
*opc = "LOCK_SH | LOCK_NB";
continue;
}
if (strncmp (str, "x", 2) == 0)
{
*op = LOCK_EX;
*opc = "LOCK_EX";
continue;
}
if (strncmp (str, "xn", 2) == 0)
{
*op = LOCK_EX | LOCK_NB;
*opc = "LOCK_EX | LOCK_NB";
continue;
}
if (strncmp (str, "u", 2) == 0)
{
*op = LOCK_UN;
*opc = "LOCK_UN";
continue;
}
if (strncmp (str, "st", 2) == 0)
{
str = argv[++i];
if (str)
{
errno = 0;
tmp = strtol (str, &endptr, 10);
if (tmp == 0 && errno != 0)
error (1, errno, "%s", str);
if (endptr == str)
error (1, EINVAL, "%s", str);
*sleep_time = tmp;
}
else
error (1, EINVAL, "%s", str);
continue;
}
error (1, EINVAL, "%s", str);
}
return 0;
}
int main (int argc, char **argv)
{
#ifdef __GNU__
error_t err;
#else
int err;
#endif
int fd, ret = -1;
char *file_name = NULL;
int flags = O_RDONLY;
char *flagsc = "O_RDONLY";
int op = LOCK_SH;
char *opc = "LOCK_SH";
int sleep_time = 10;
ret = parse_args (argc, argv, &file_name,
&flags, &flagsc,
&op, &opc,
&sleep_time);
#ifdef __GNU__
printf ("test-flock: GNU/Hurd\n");
#else
printf ("test-flock: GNU/Linux\n");
#endif
printf ("file = '%s', flags = %s\n", file_name, flagsc);
fd = open (file_name, flags);
if (fd < 0)
error (1, errno, "open");
printf ("Opening '%s', fd = %d, ", file_name, fd);
printf ("operation = %s\n", opc);
printf ("Requesting lock\n");
err = flock (fd, op);
if (err)
error (1, errno, "flock");
printf ("Got lock: sleep_time = %d seconds\n", sleep_time);
sleep (sleep_time);
printf ("Closing '%s'\n", file_name);
close (fd);
return ret;
}
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