103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <linux/fcntl.h>
|
||
#include <stdio.h>
|
||
#include <sys/file.h>
|
||
#include <unistd.h>
|
||
#include <signal.h>
|
||
#include <err.h>
|
||
#include <errno.h>
|
||
#include <string.h>
|
||
|
||
/* не работает с nfs */
|
||
void ex1()
|
||
{
|
||
|
||
FILE *f = fopen("fcntl_lockfile.c", "wb");
|
||
|
||
if(f != NULL && !flock(fileno(f), LOCK_EX | LOCK_NB))// !ftrylockfile(f))
|
||
puts("Success!");
|
||
|
||
else
|
||
puts("Failed!");
|
||
|
||
getchar();
|
||
}
|
||
|
||
/* только для 1-го процесса */
|
||
void ex2()
|
||
{
|
||
FILE *f = fopen("fcntl_lockfile.c", "wb");
|
||
|
||
if(f != NULL && !ftrylockfile(f)) {
|
||
flockfile(f);
|
||
puts("Success!");
|
||
|
||
} else
|
||
puts("Failed!");
|
||
|
||
getchar();
|
||
}
|
||
|
||
/* с cifs не работает */
|
||
void sighandler(int signum)
|
||
{
|
||
printf("signal %d received\n", signum);
|
||
}
|
||
void ex3()
|
||
{
|
||
signal(SIGPOLL, sighandler);
|
||
|
||
int fd = open("fcntl_lockfile.c", O_RDWR | O_NONBLOCK);
|
||
//~ int fd = open("/mnt/smb/fs04/Users/ПРОЕКТЫ/Отчетник Климов/lock_ex", O_RDWR | O_NONBLOCK);
|
||
//~ int fd = open("/mnt/smb/kolan/shared/lock_ex", O_RDWR | O_NONBLOCK);
|
||
|
||
|
||
if (fd == -1)
|
||
err(errno, "open()");
|
||
|
||
if (fcntl(fd, F_SETLEASE, F_WRLCK) == -1)
|
||
err(errno, "fcntl()");
|
||
|
||
puts("Success!");
|
||
|
||
getchar();
|
||
}
|
||
|
||
/* зашибись - метод :)
|
||
* Консультативная (advisory) блокировка... */
|
||
|
||
void ex4()
|
||
{
|
||
signal(SIGPOLL, sighandler);
|
||
|
||
//~ int fd = open("fcntl_lockfile.c", O_RDWR | O_NONBLOCK);
|
||
//~ int fd = open("/mnt/smb/fs04/Users/ПРОЕКТЫ/Отчетник Климов/lock_ex", O_RDWR | O_NONBLOCK);
|
||
int fd = open("/mnt/smb/kolan/shared/lock_ex", O_RDWR | O_NONBLOCK);
|
||
|
||
|
||
if (fd == -1)
|
||
err(errno, "open()");
|
||
|
||
struct flock flck;
|
||
memset(&flck, 0, sizeof(flck));
|
||
flck.l_type = F_WRLCK;
|
||
|
||
if (fcntl(fd, F_SETLK, &flck) == -1)
|
||
err(errno, "fcntl()");
|
||
|
||
puts("Success!");
|
||
|
||
getchar();
|
||
}
|
||
|
||
int main()
|
||
{
|
||
//~ ex1();
|
||
//~ ex2();
|
||
//~ ex3();
|
||
ex4();
|
||
|
||
return 0;
|
||
}
|