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    SubjectRe: 2.3.51 -- I am still seeing the"shmget: shm filesystem not mounted" error
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    Date
    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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