SHMDT(2,L)                  AIX Technical Reference                  SHMDT(2,L)



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shmdt



PURPOSE

Detaches a shared memory segment.

SYNTAX

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

int shmdt (shmaddr)
char *shmaddr;

DESCRIPTION

The shmdt system call detaches, from the calling process's data segment, the
shared memory segment located at the address specified by the shmaddr
parameter.

RETURN VALUE

Upon successful completion, a value of 0 is returned.  If shmdt fails, a value
of -1 is returned and errno is set to indicate the error.

ERROR CONDITIONS

The shmdt system call fails and the shared memory segment is not detached if
the following is true:

EINVAL    The shmaddr parameter is not the data segment start address of a
          shared memory segment.

ETXTBSY   The shmdt system call attempted to detach a segment attached to a
          shared library.

RELATED INFORMATION

In this book:  "exec:  execl, execv, execle, execve, execlp, execvp," "exit,
_exit," "fork, vfork," "shmat," "shmctl," and "shmget."











Processed November 7, 1990        SHMDT(2,L)                                  1