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hashcat/src/locking.c

73 lines
1.2 KiB
C

/**
* Author......: See docs/credits.txt
* License.....: MIT
*/
#include "common.h"
#include "types.h"
#include "locking.h"
#include "shared.h"
#if defined (F_SETLKW)
int hc_lockfile (HCFILE *fp)
{
if (fp == NULL) return -1;
struct flock lock;
memset (&lock, 0, sizeof (struct flock));
lock.l_type = F_WRLCK;
while (fcntl (fp->fd, F_SETLKW, &lock))
{
// These shouldn't happen with F_SETLKW yet are (rarely) seen IRL. Recoverable!
if (errno == EAGAIN || errno == ENOLCK)
{
struct timeval tv = { .tv_sec = 0, .tv_usec = 10000 };
select (0, NULL, NULL, NULL, &tv);
continue;
}
// A signal may interrupt a wait for lock with EINTR. Anything else is fatal
if (errno != EINTR) return -1;
}
return 0;
}
int hc_unlockfile (HCFILE *fp)
{
if (fp == NULL) return -1;
struct flock lock;
memset (&lock, 0, sizeof (struct flock));
lock.l_type = F_UNLCK;
if (fcntl (fp->fd, F_SETLK, &lock)) return -1;
return 0;
}
#else
int hc_lockfile (MAYBE_UNUSED HCFILE *fp)
{
// we should put windows specific code here
return 0;
}
int hc_unlockfile (MAYBE_UNUSED HCFILE *fp)
{
// we should put windows specific code here
return 0;
}
#endif // F_SETLKW