Attachment 829924 Details for Bug 1035491 – test C lock program

test C lock program

locktest.c (text/x-c++src), 2.94 KB, created by Mike Watkins on 2013-11-27 22:17:13 UTC

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Creator: Mike Watkins

Created: 2013-11-27 22:17:13 UTC

Size: 2.94 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <unistd.h>
>#include <errno.h>
>#include <string.h>
>#include <fcntl.h>
>#include <time.h>
>#include <sys/stat.h>
>#include <sys/utsname.h>
>
>int WriteLock(int fd);
>int ReadLock(int fd);
>int UnLock(int fd);
>
>int main(void) {
>	const char *filename = "/mnt/amqrhss/jboss_a-mq.lock";
>	int fd = -1;
>	char writestr[100];
>	const int readmax = 128;
>	char readbuffer[readmax];
>	int myerr = errno;
>
>	struct tm *newtime;
>	time_t ltime;
>    	time(&ltime);
>    	newtime = localtime(&ltime);
>
>	struct tm tnow = *gmtime(&ltime);
>    	char    timestr[100];
>    	strftime( timestr, sizeof timestr, "%a %b %d %Y %T %Z%z", &tnow );
>
>	memset(writestr,0,100);
>
>	struct utsname my_uname;
>	if(uname(&my_uname) == -1)
>   		printf("uname call failed!");
>	else
>   		sprintf(writestr,"Server: %s\nLock Creation Time: %s\n", my_uname.nodename, timestr);
>
>
>	if ((fd = open(filename, O_RDWR| O_CREAT, S_IRUSR| S_IWUSR)) == -1) {
>		printf("ERROR: open errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>
>	}
>
>	if (WriteLock(fd) == EXIT_FAILURE) {
>		printf("ERROR: WriteLock errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	} else 
>		printf("Got the file lock...\n");
>
>	if (write(fd, (const void *) writestr, strlen(writestr) + 1) == -1) {
>		printf("ERROR: write errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>	fsync(fd);
>
>        int i;
>        for (i=0; i<200;i++) { 
>          system("clear; date; ls -lrt /mnt/amqrhss");
>          printf("%d ",i); fflush(stdout); 
>          sleep(1);
>        }
>        printf("\n");
>
>
>	if (UnLock(fd) == EXIT_FAILURE) {
>		return EXIT_FAILURE;
>	}
>
>	if (close(fd) == -1) {
>		printf("ERROR: close errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>
>/*
>	if (unlink(filename) == -1) {
>		printf("ERROR: unlink errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>*/
>
>	return EXIT_SUCCESS;
>}
>
>int WriteLock(int fd) {
>	struct flock fd_flock;
>	fd_flock.l_type = F_WRLCK;/*Write lock*/
>	fd_flock.l_whence = SEEK_SET;
>	fd_flock.l_start = 0;
>	fd_flock.l_len = 0;/*Lock whole file*/
>
>	if (fcntl(fd, F_SETLKW,&fd_flock) == -1) {
>		int myerr = errno;
>		printf("ERROR: fcntl errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>	return EXIT_SUCCESS;
>}
>
>int ReadLock(int fd) {
>	struct flock fd_flock;
>	fd_flock.l_type = F_RDLCK;/*Write lock*/
>	fd_flock.l_whence = SEEK_SET;
>	fd_flock.l_start = 0;
>	fd_flock.l_len = 0;/*Lock whole file*/
>
>	if (fcntl(fd, F_SETLKW,&fd_flock) == -1) {
>		int myerr = errno;
>		printf("ERROR: fcntl errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>	return EXIT_SUCCESS;
>}
>
>int UnLock(int fd) {
>	struct flock fd_flock;
>	fd_flock.l_type = F_UNLCK;/*Write lock*/
>	fd_flock.l_whence = SEEK_SET;
>	fd_flock.l_start = 0;
>	fd_flock.l_len = 0;/*Lock whole file*/
>
>	if (fcntl(fd, F_SETLKW,&fd_flock) == -1) {
>		int myerr = errno;
>		printf("ERROR: fcntl errno(%d): %s\n", errno,strerror(myerr));
>		return EXIT_FAILURE;
>	}
>	return EXIT_SUCCESS;
>}
>

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Attachments on bug 1035491: 829924