sem_open problem

[Green Light]

It works fine!!

Thanks Ravi!!

BRA> Hello,

BRA>   You have to use librt to get semaphore calls. Try 

BRA>         gcc ./TestProc.cpp -o ./TestProc -lrt.

BRA> It should work.

BRA> regards,
BRA> Ravi

BRA> -----Original Message-----
BRA> From: Green Light [mailto:greenlightrh@yahoo.com.ar]
BRA> Sent: Friday, May 02, 2003 2:12 PM
BRA> To: gcc-help@gcc.gnu.org
BRA> Subject: sem_open problem


BRA> This is a very simple application, i want to create a semaphore and use
BRA> it.

BRA> I'm using version:
BRA>   gcc (GCC) 3.2.3 20030222 (Red Hat Linux 3.2.2-5)
BRA>   installed by Red Hat Linux 9 installer

BRA> I'm compiling using:
BRA>   gcc ./TestProc.cpp -o ./TestProc

BRA> The return is:
BRA> In function 'main':
BRA> reference to 'sem_open' without definition
BRA> collect2: ld returned 1 exit status

BRA> This is the code:
BRA> //=================================================================

BRA> #include <semaphore.h>
BRA> #include <fcntl.h>

BRA> int main()
BRA> {
BRA>         sem_t                   *unSem;
BRA>         int                     oflag = O_CREAT;
BRA>         mode_t                  mode = 0644;
BRA>         const char              semNombre[] = "/unSem.sem1";
BRA>         unsigned int            value = 0;
BRA>         int                     sts;

BRA>         unSem = sem_open(semNombre, oflag, mode, value);
BRA>         if (unSem == (void *)-1)
BRA>         {
BRA>                 printf("fallo");
BRA>         }
BRA>         else
BRA>         {
BRA>                 printf("Semaforo creado");
BRA>         }

BRA>     return 0;
BRA> }

BRA> //=================================================================

BRA> Any help or sugestion for me?

BRA> Thanks!, Pablo.