Attachment 1495 Details for Bug 4992 – Тест описывающий проблему

Тест описывающий проблему

test_lock.c (text/plain), 2.79 KB, created by Pavel Shilovsky on 2010-11-18 03:58:26 MSK

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Creator: Pavel Shilovsky

Created: 2010-11-18 03:58:26 MSK

Size: 2.79 KB

patch

obsolete

>#include <stdio.h>
>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <string.h>
>#include <sys/socket.h>
>
>#include <unistd.h>
>
>int main ()
>{
>    char buf[13030];
>    int len, fd, rc, ipc[2], rc2, i;
>    struct flock flk;
>
>    pid_t ppid = getpid();
>
>    printf("start %d\n", getpid());
>
>    fd = open("PDOXUSRS.NET", O_CREAT | O_TRUNC | O_RDWR, S_IRUSR | S_IWUSR);
>    for(i = 0; i < 16; i++)
>        write(fd, "a", 1);
>    close(fd);
>
>    fd = open("PDOXUSRS.NET", O_RDWR);
>    flk.l_type = F_WRLCK;
>    flk.l_whence = SEEK_SET;
>    flk.l_start = 0;
>    flk.l_len = 1;
>
>    if (fcntl(fd, F_SETLK, &flk) < 0)
>        fprintf(stderr, "fcntl set lock on %d failed (%s)\n", fd, strerror(errno));
>
>    rc = fork();
>    if (rc < 0) {
>        fprintf(stderr, "fork failed\n");
>        return 1;
>    }
>
>    if (rc == 0) {
>        memset(&flk, 0, sizeof(flk));
>        flk.l_type = F_WRLCK;
>        flk.l_whence = SEEK_SET;
>        flk.l_start = 0;
>        flk.l_len = 1;
>
>        if (fcntl(fd, F_GETLK, &flk) < 0)
>            fprintf(stderr, "ch1: fcntl get lock on %d failed (%s)\n", fd, strerror(errno));
>        if (flk.l_type == F_UNLCK)
>            fprintf(stderr, "ch1: unlck\n");
>        else
>            fprintf(stderr, "ch1: locked\n");
>        close(fd);
>        fprintf(stderr, "ch1: done\n");
>        return 0;
>    }
>    sleep(1);
>    rc = fork();
>    if (rc < 0) {
>        fprintf(stderr, "fork2 failed\n");
>        return 1;
>    }
>    if (rc == 0) {
>        memset(&flk, 0, sizeof(flk));
>        flk.l_type = F_WRLCK;
>        flk.l_whence = SEEK_SET;
>        flk.l_start = 0;
>        flk.l_len = 1;
>
>        if (fcntl(fd, F_GETLK, &flk) < 0)
>            fprintf(stderr, "ch2: fcntl get lock on %d failed (%s)\n", fd, strerror(errno));
>        if (flk.l_type == F_UNLCK)
>            fprintf(stderr, "ch2: unlck\n");
>        else
>            fprintf(stderr, "ch2: locked\n");
>
>        flk.l_type = F_UNLCK;
>        flk.l_whence = SEEK_SET;
>        flk.l_start = 0;
>        flk.l_len = 1;
>        if (fcntl(fd, F_SETLK, &flk) < 0)
>            fprintf(stderr, "ch2: fcntl set lock on %d failed (%s)\n", fd, strerror(errno));
>        fprintf(stderr, "ch2: done\n");
>        return 0;
>    }
>    sleep(1);
>    rc = fork();
>    if (rc < 0) {
>        fprintf(stderr, "fork3 failed\n");
>        return 1;
>    }
>    if (rc == 0) {
>        memset(&flk, 0, sizeof(flk));
>        flk.l_type = F_WRLCK;
>        flk.l_whence = SEEK_SET;
>        flk.l_start = 0;
>        flk.l_len = 1;
>
>        if (fcntl(fd, F_GETLK, &flk) < 0)
>            fprintf(stderr, "ch3: fcntl get lock on %d failed (%s)\n", fd, strerror(errno));
>        if (flk.l_type == F_UNLCK)
>            fprintf(stderr, "ch3: unlck\n");
>        else
>            fprintf(stderr, "ch3: locked\n");
>        return 0;
>    }
>    sleep(1);
>    printf("done\n");
>}

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