I'm trying to port some Unix software that extensively uses shared
memory, semaphores, and threads. Not sure if I'm pushing sh*t uphill,
but I got cygipc-1.13-2 installed, and the IPC daemon running. I have a
simple case that hopefully shows my error ...
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <cygwin/ipc.h>
#include <cygwin/shm.h>
int main (int argc, char **argv) {
int shm_id ;
struct shmid_ds shm_buf ;
int ret ;
shm_id = shmget(1234, 1048576, IPC_CREAT | IPC_EXCL | 0660) ;
printf ("shm_id = %d\n", shm_id) ;
ret = shmctl (shm_id, IPC_STAT, &shm_buf) ;
printf ("ret = %d (%s)\n", ret, (ret == -1 ? strerror(errno) :
"")) ;
}
[src]$ gcc aa.c -o aa -L/usr/local/lib -lcygipc
[src]$ ./aa
shm_id = 1280
ret = -1 (Invalid argument)
[src]$ ipcs -a
---------- Shared Memory Segments --------
shmid key bytes nattch status
_shm 1280 1234 1048576 0
---------- Semaphore Arrays --------
semid nsems key
---------- Message Queues --------
msqid used-bytes messages
What am I missing here ? The code works fine on Linux, HP-UX, Solaris,
...
Thanks,
Steve
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