Mega Code Archive
Fcntl, locking files
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#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#define PACKAGE "crlock"
int main(void) {
int fd = 0;
int i = 5;
for(; i > 0; i--) {
if((fd = open("locked.file", O_RDWR|O_CREAT|O_EXCL, 0444)) == -1) {
fprintf(stderr, "%s [%d]: Error - file already locked ...\n", PACKAGE, getpid());
sleep(1);
} else {
fprintf(stdout, "%s [%d]: Now I am the only one with access :-)\n",
PACKAGE, getpid());
sleep(1);
close(fd);
unlink("locked.file");
sleep(1);
} /* else */
} /* while */
return 0;
}
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