Re: sem_open(3) and FBSD 5.2 : what the point ?

[Dan Nelson]

In the last episode (Feb 06), Eric Jacoboni said:
> Here's a sample code:
> 
> #include 
...
>dis_ping = sem_open("/ping.sem", O_CREAT, 0777, 1);
...
> 
> On FBSD 5.2, gcc first complains it doesn't know about O_CREAT...
> That's not what the sem_open() manpage claims but, ok, let's include
> .
> 
> The code, then, compile ok, but fails on :
> 
> $ ./ping.exe
> zsh: invalid system call (core dumped)  ./ping.exe
> 
> Any idea?

Have you enabled them in your kernel config?  From /sys/conf/NOTES :

# p1003_1b_semaphores are very experimental,
# user should be ready to assist in debugging if problems arise.
options P1003_1B_SEMAPHORES

-- 
Dan Nelson
[EMAIL PROTECTED]
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sem_open(3) and FBSD 5.2 : what the point ?

[Eric Jacoboni]

Hi,

Here's a sample code:

#include 
#include 
int main(void) {

   sem_t *dis_ping, *dis_pong;

   dis_ping = sem_open("/ping.sem", O_CREAT, 0777, 1);
   dis_pong = sem_open("/pong.sem", O_CREAT, 0777, 0);
   for(;;) {
 sem_wait(dis_ping);
 puts("Ping...");
 sem_post(dis_pong);
   }
   sem_close(dis_ping);
   sem_close(dis_pong);
   return 0;
}
This code compiles and works fine on Darwin...

On FBSD 5.2, gcc first complains it doesn't know about O_CREAT... That's 
not what the sem_open() manpage claims but, ok, let's include .

The code, then, compile ok, but fails on :

$ ./ping.exe
zsh: invalid system call (core dumped)  ./ping.exe
Any idea?
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