diff options
Diffstat (limited to 'test/testflock.c')
-rw-r--r-- | test/testflock.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/test/testflock.c b/test/testflock.c new file mode 100644 index 000000000..635c43ccf --- /dev/null +++ b/test/testflock.c @@ -0,0 +1,173 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + */ + +/* + * USAGE + * + * Start one process, no args, and place it into the background. Start a + * second process with the "-r" switch to attempt a read on the file + * created by the first process. + * + * $ ./testflock & + * ...messages... + * $ ./testflock -r + * ...messages... + * + * The first process will sleep for 30 seconds while holding a lock. The + * second process will attempt to grab it (non-blocking) and fail. It + * will then grab it with a blocking scheme. When the first process' 30 + * seconds are up, it will exit (thus releasing its lock). The second + * process will acquire the lock, then exit. + */ + +#include "apr_pools.h" +#include "apr_file_io.h" +#include "apr_time.h" +#include "apr_general.h" +#include "apr_getopt.h" +#include "apr_strings.h" + +#include <stdlib.h> +#include <stdio.h> + +#define TESTFILE "testfile.tmp" + +static apr_pool_t *pool = NULL; + + +static void errmsg(const char *msg) +{ + if (pool != NULL) + apr_destroy_pool(pool); + fprintf(stderr, msg); + exit(1); +} + +static void do_read(void) +{ + apr_file_t *file; + apr_status_t status; + + if (apr_open(&file, TESTFILE, APR_WRITE, + APR_OS_DEFAULT, pool) != APR_SUCCESS) + errmsg("Could not open test file.\n"); + printf("Test file opened.\n"); + + status = apr_lock_file(file, APR_FLOCK_EXCLUSIVE | APR_FLOCK_NONBLOCK); + if (!APR_STATUS_IS_EAGAIN(status)) { + char msg[200]; + errmsg(apr_psprintf(pool, "Expected EAGAIN. Got %d: %s.\n", + status, apr_strerror(status, msg, sizeof(msg)))); + } + printf("First attempt: we were properly locked out.\nWaiting for lock..."); + fflush(stdout); + + if (apr_lock_file(file, APR_FLOCK_EXCLUSIVE) != APR_SUCCESS) + errmsg("Could not establish lock on test file."); + printf(" got it.\n"); + + (void) apr_close(file); + printf("Exiting.\n"); +} + +static void do_write(void) +{ + apr_file_t *file; + + if (apr_open(&file, TESTFILE, APR_WRITE|APR_CREATE, APR_OS_DEFAULT, + pool) != APR_SUCCESS) + errmsg("Could not create file.\n"); + printf("Test file created.\n"); + + if (apr_lock_file(file, APR_FLOCK_EXCLUSIVE) != APR_SUCCESS) + errmsg("Could not lock the file.\n"); + printf("Lock created.\nSleeping..."); + fflush(stdout); + + apr_sleep(30000000); /* 30 seconds */ + + (void) apr_close(file); + printf(" done.\nExiting.\n"); +} + +int main(int argc, const char * const *argv) +{ + int reader = 0; + apr_status_t status; + char optchar; + const char *optarg; + apr_getopt_t *opt; + + if (apr_initialize() != APR_SUCCESS) + errmsg("Could not initialize APR.\n"); + atexit(apr_terminate); + + if (apr_create_pool(&pool, NULL) != APR_SUCCESS) + errmsg("Could not create global pool.\n"); + + if (apr_initopt(&opt, pool, argc, argv) != APR_SUCCESS) + errmsg("Could not parse options.\n"); + + while ((status = apr_getopt(opt, "r", &optchar, &optarg)) == APR_SUCCESS) { + if (optchar == 'r') + ++reader; + } + + if (reader) + do_read(); + else + do_write(); + + return 0; +} |