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Red Hat Bugzilla – Attachment 183681 Details for
Bug 272301
Bad things happen when you attempt multiple flocks from a single process
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Program to create the problem.
flucker.c (text/x-csrc), 911 bytes, created by
Abhijith Das
on 2007-08-31 16:47:34 UTC
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Description:
Program to create the problem.
Filename:
MIME Type:
Creator:
Abhijith Das
Created:
2007-08-31 16:47:34 UTC
Size:
911 bytes
patch
obsolete
>#include <stdio.h> >#include <stdlib.h> >#include <unistd.h> >#include <sys/types.h> >#include <sys/stat.h> >#include <fcntl.h> >#include <sys/file.h> >#include <string.h> >#include <time.h> >#include <errno.h> > >void doublelock(char *filename) >{ > int fd1, fd2; > > if ((fd1 = open(filename, O_CREAT|O_RDWR, 0644)) == -1) { > fprintf(stderr, "Could not open %s\n", filename); > perror(""); > exit(1); > } > if ((fd2 = open(filename, O_RDWR, 0644)) == -1) { > fprintf(stderr, "Couldn't open %s for the second time\n", filename); > perror(""); > exit(1); > } > int flock(int fd, int operation); > if (flock(fd1, LOCK_EX | LOCK_NB) == -1) { > fprintf(stderr, "Couldn't flock once\n"); > perror(""); > exit(1); > } > if (flock(fd2, LOCK_EX | LOCK_NB) == -1) { > fprintf(stderr, "Couldn't flock twice\n"); > perror(""); > exit(1); > } > close(fd1); > close(fd2); >} > >int main(int argc, char *argv[]) >{ > doublelock(argv[1]); > return 0; >} >
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