Attachment 210952 Details for Bug 384481

Testcase.

test-lock.c (text/x-c++src), 1.52 KB, created by Petr Mladek on 2008-04-28 19:08:31 UTC

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Creator: Petr Mladek

Created: 2008-04-28 19:08:31 UTC

Size: 1.52 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <fcntl.h>
>#include <sys/stat.h>
>
>#define OPEN_WRITE_FLAGS ( O_RDWR )
>#define OPEN_CREATE_FLAGS ( O_CREAT | O_EXCL | O_RDWR )
>
>
>int main ( int argc, char *argv[] )
>{
>    struct flock aflock;
>    int  fd;
>    int  mode  = S_IRUSR | S_IRGRP | S_IROTH;
>    int  flags = O_RDONLY;
>    int  ret;
>
>    if (argc != 2)
>    {
>	fprintf (stderr, "Please, enter a writable file as the argument\n");
>	exit(1);
>    }
>
>    // locking the complete file 
>    aflock.l_type = F_WRLCK;
>    aflock.l_whence = SEEK_SET;
>    aflock.l_start = 0;
>    aflock.l_len = 0;
>
>    mode |= S_IWUSR | S_IWGRP | S_IWOTH;
>    flags = OPEN_WRITE_FLAGS;
>
>    // open the file
>    fd = open( argv[1], flags, mode );
>
>    if ( fd >= 0 )
>    {
>	printf ("Open succeeded: %s\n", argv[1]);
>        // lock the file
>        if ( -1 == fcntl( fd, F_SETLK, &aflock ) )
>	{
>//	    perror("locking:");
>	    fprintf (stderr, "Error: locking failed\n" );
>	    exit(1);
>	}
>	else
>	    printf ("Lock succeeded: %s\n", argv[1]);
>	    
>    }
>    else 
>    {
>        fprintf (stderr, "Error: can't open file: %s for writing\n", argv[1]);
>	exit (1);
>    }
>
>
>    // release the file lock
>    aflock.l_type = F_UNLCK;
>    aflock.l_whence = SEEK_SET;
>    aflock.l_start = 0;
>    aflock.l_len = 0;
>
>    if( -1 == fcntl( fd, F_SETLK, &aflock ) )
>    {
>//	perror("locking:");
>	fprintf (stderr, "Error: unlock failed\n" );
>    }
>    else
>	printf ("Unlock succeeded: %s\n", argv[1]);
>	
>
>    if( close (fd) == 0) 
>	printf ("Close  succeeded: %s\n", argv[1]);
>    
>    return 0;
>}

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