Hello,
I try to comiple an run the distcc package - but I get errors while running.
I figured out, tha the problems are the fcntl() calls - perhaps
ther is a bug in cygwin?
The following code runs differently in cygwin and linux.
If I want ro lock the whole file twice, but still the same process, I will
get an "permission denied" error on cygwin.
The same code works on linux!
===> Cygwin console
heiko@HEIKO ~/src/fslock
$ ./fslocktest
Lock 1
Lock 2
lock failed: fslocktest.txt: Permission denied
===> linux console
heiko@linux:~/src/fslock> ./fslocktest
Lock 1
Lock 2
Below is the code to reproduce the error.
I'm using the following software:
- Windows XP Professional Ver 5.1 Build 2600 Service Pack 1
CYGWIN=ntsec
- Cygwin DLL version info:
DLL version: 1.3.18
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 69
Shared data: 3
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Wed Dec 25 15:37:50 EST 2002
Shared id: cygwin1S3
- Linux: Suse 8.1
Perhaps someone can give me a hint ...
Best regards
Heiko Elger
------------ snip - snip - snip --------------------
/*
make CFLAGS="-Wall -g -O0" testfcntl.c
*/
int main(int argc, char** argv, char** envp)
{
int fd ;
char* fname = "fslocktest.txt";
int rc;
struct flock lockparam;
lockparam.l_type = F_WRLCK;
lockparam.l_whence = SEEK_SET;
lockparam.l_start = 0;
lockparam.l_len = 0; /* whole file */
fd = open(fname, O_WRONLY|O_CREAT, 0600);
if (fd == -1 && errno != EEXIST)
{
printf("failed to creat %s: %s", fname, strerror(errno));
return errno;
}
printf("Lock 1\n");
rc = fcntl(fd, F_SETLK, &lockparam);
if (rc==-1)
{
printf("lock failed: %s: %s", fname, strerror(errno));
return errno;
}
printf("Lock 2\n");
rc = fcntl(fd, F_SETLK, &lockparam);
if (rc==-1)
{
printf("lock failed: %s: %s", fname, strerror(errno));
return errno;
}
close(fd);
return 0;
}
------------ snip - snip - snip --------------------
Heiko Elger
,,,
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