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/*
gcc writer.c -o writer -Wall
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
int main(void)
{
int fd_old, fd_new, ret;
for (;;) {
fd_old = open("dovecot.index", O_RDWR);
if (fd_old == -1) {
perror("open(dovecot.index");
break;
}
usleep(rand() % 1000);
fd_new = creat("dovecot.index.tmp", 0600);
if (fd_new == -1) {
perror("creat(dovecot.index.tmp)");
break;
}
write(fd_new, "foo", 3);
close(fd_new);
ret = link("dovecot.index", "dovecot.index.backup.tmp");
if (ret < 0) {
perror("link(dovecot.index, dovecot.index.backup.tmp)");
break;
}
if (rename("dovecot.index.backup.tmp", "dovecot.index.backup") < 0) {
perror("rename(dovecot.index.backup.tmp, dovecot.index.backup)");
break;
}
usleep(rand() % 1000);
if (rename("dovecot.index.tmp", "dovecot.index") < 0) {
perror("rename(dovecot.index.tmp, dovecot.index)");
break;
}
usleep(rand() % 1000);
close(fd_old);
}
return 0;
}
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