int create_pid_file()

in sample_app/onvif_camera_mock/artifacts/onvif_srvd/src/daemon.c [202:245]

• 31 lines of code
• 6 McCabe index (conditional complexity)

int create_pid_file(const char *pid_file_name)
{
    int fd;
    const int BUF_SIZE = 32;
    char buf[BUF_SIZE];



    if( !pid_file_name )
    {
        errno = EINVAL;
        return -1;
    }


    fd = open(pid_file_name, O_RDWR | O_CREAT, 0644);
    if(fd == -1)
        return -1; // Could not create on PID file


    if( lockf(fd, F_TLOCK, 0) == -1 )
    {
        close(fd);
        return -1; // Could not get lock on PID file
    }


    if( ftruncate(fd, 0) != 0 )
    {
        close(fd);
        return -1; // Could not truncate on PID file
    }


    snprintf(buf, BUF_SIZE, "%ld\n", (long)getpid());
    if( write(fd, buf, strlen(buf)) != (int)strlen(buf) )
    {
        close(fd);
        return -1; // Could not write PID to PID file
    }


    return fd; //good job
}