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SubjectRe: 2.3.51 -- I am still seeing the"shmget: shm filesystem not mounted" error
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> > I don't believe it. Solaris, Tru64 and BSD all disallow attaches after
> > IPC_RMID. (I just tested them, in fact.) The *segment* is still alive until
> > nattch==0, of course, but nobody can attach to it.
>
> Just how are you testing. My test set works.
>
> > Apps full of linuxisms are a pain to port.
>
> Indeed. I've also got a test patch to fix the API breakage in the shmfs code
> and it seems very easy to fix, with the added bonus that I mended chrooted
> sys5 ipc (wrongly in the draft patch 8))

test prog attached.

Greetings
Christoph

--
#include <stdlib.h>
#include <stdio.h>

#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

int main (int ac, char **av) {
int seg, stat;
if ((seg = shmget (IPC_PRIVATE, 4000, IPC_CREAT| 0600)) == -1) {
perror("shmget");
exit (1);
}
if (shmat (seg, 0, 0) == (void*) -1) {
perror ("shmat");
exit (2);
}
if (shmctl (seg, IPC_RMID, NULL) == -1) {
perror ("shmctl");
exit (2);
}
switch (fork()) {
case -1:
perror ("fork");
return (3);
case 0:
if (shmat (seg, 0, 0) != (void*) -1)
printf ("shmat in client ok\n");
else
perror ("shmat in client failed");
return (0);
default:
wait(&stat);
}
exit (0);
}
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