Locking and unlocking files using C API in Ubuntu LInux

问题

How can I lock a file for a specified period of time (10 seconds) using the C language in Ubuntu Linux ?

回答1:

It works like this:

#include <io.h>
#include <sys/file.h>
...
int f = open ("filename", O_RDONLY);
if (f < 0)
       error();
if (flock (f, LOCK_EX))
       error();
sleep (10);

if (flock (f, LOCK_UN))
       error();
...

回答2:

Use fcntl(2) to lock the file, then use alarm(2) to call your SIGALRM handler which will then unlock it.

来源：https://stackoverflow.com/questions/2058891/locking-and-unlocking-files-using-c-api-in-ubuntu-linux