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SubjectRe: blocking file lock functions (lockf,flock,fcntl) do not return after timer signal
On 10/12/05, "Dieter Müller (BOI GmbH)" <dieter.mueller@boi.at> wrote:
> bug description:
>
> flock, lockf, fcntl do not return even after the signal SIGALRM has
> been raised and the signal handler function has been executed
> the functions should return with a return value EWOULDBLOCK as described
> in the man pages

To confirm:

#include <unistd.h>
#include <sys/time.h>
#include <sys/file.h>
#include <time.h>
#include <signal.h>

void alrm(int sig)
{
write(2, "timeout\n", 8);
}
int main(int argc, char* argv[])
{
struct itimerval tv = {
.it_interval = {.tv_sec = 10, .tv_usec = 0},
.it_value = {.tv_sec = 10, .tv_usec = 0},
};
struct itimerval otv;
signal(SIGALRM, alrm);
setitimer(ITIMER_REAL, &tv, &otv);
int fd = open(argv[1], O_RDWR);
if ( fd < 0 )
{
perror(argv[1]);
return 1;
}
printf("locking...\n");
if ( flock(fd, LOCK_EX) < 0 )
{
perror("flock");
return 1;
}
printf("sleeping...\n");
int ch;
read(0, &ch, 1);
close(fd);
return 0;
}
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