Date: Fri, 22 Dec 1995 14:57:13 -0500 From: tsingle@sunland.gsfc.nasa.gov (Tim Singletary) To: hackers@freebsd.org Subject: /usr/include/sys/shm.h vs `man 2 shmget' Message-ID: <199512221957.OAA10601@sunward.gsfc.nasa.gov.gsfc743>
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In FreeBSD 2.1, `man 2 shmget' refers to SHM_R and SHM_W. But these
names aren't defined anywhere. Instead, /usr/include/sys/ipc.h
defines IPC_R and IPC_W.
Checking other versions of unix I find:
Solaris, SunOS, and HPUX define SHM_R and SHM_W in /usr/include/sys/shm.h
They don't define IPC_R or IPC_W anywhere.
OSF1 defines SHM_R and SHM_W in /usr/include/sys/shm.h and IPC_R and
IPC_W in /usr/include/sys/ipc.h. Furthermore, OSF1's
/usr/include/sys/shm.h defines `#define SHM_R IPC_R' and
`#define SHM_W IPC_W'.
For maximum portability I recommend the following patch to
/usr/include/sys/shm.h:
=begin==============
*** shm.h-org Sun Oct 2 13:24:54 1994
--- shm.h Fri Dec 22 09:51:50 1995
***************
*** 44,49 ****
--- 44,51 ----
#define SHM_RDONLY 010000 /* Attach read-only (else read-write) */
#define SHM_RND 020000 /* Round attach address to SHMLBA */
#define SHMLBA CLBYTES /* Segment low boundry address multiple */
+ #define SHM_R IPC_R
+ #define SHM_W IPC_W
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission structure */
=end================
tim
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