Update manual for sem_init and sem_open, restrictions of shared semaphore

and 14 characters in name length no longer exist.

Reviewed by:	deischen@

2 files changed, 17 insertions, 9 deletions

diff --git a/lib/libc/gen/sem_init.3 b/lib/libc/gen/sem_init.3
index 5938f2c..e00cd4b 100644
--- a/lib/libc/gen/sem_init.3
+++ b/lib/libc/gen/sem_init.3
@@ -46,9 +46,19 @@ function initializes the unnamed semaphore pointed to by
 .Fa sem
 to have the value
 .Fa value .
+.Pp
 A non-zero value for
 .Fa pshared
-specifies a shared semaphore that can be used by multiple processes.
+specifies a shared semaphore that can be used by multiple processes,
+the semaphore should be located in shared memory region (see
+.Xr mmap 2 ,
+.Xr shm_open 2 , 
+and
+.Xr shmget 2 ) ,
+any process having read and write access to address
+.Fa sem
+can perform semaphore operations on
+.Fa sem .
 .Pp
 Following a successful call to
 .Fn sem_init ,
diff --git a/lib/libc/gen/sem_open.3 b/lib/libc/gen/sem_open.3
index 772bdfb..c7ee518 100644
--- a/lib/libc/gen/sem_open.3
+++ b/lib/libc/gen/sem_open.3
@@ -58,6 +58,12 @@ The returned semaphore may be used in subsequent calls to
 and
 .Fn sem_close .
 .Pp
+This implementation places strict requirements on the value of
+.Fa name :
+it must begin with a slash
+.Pq Ql / ,
+contain no other slash characters.
+.Pp
 The following bits may be set in the
 .Fa oflag
 argument:
@@ -217,11 +223,3 @@ functions conform to
 .Sh HISTORY
 Support for named semaphores first appeared in
 .Fx 5.0 .
-.Sh BUGS
-This implementation places strict requirements on the value of
-.Fa name :
-it must begin with a slash
-.Pq Ql / ,
-contain no other slash characters,
-and be less than 14 characters in length
-not including the terminating null character.