Date: Sat, 9 Jan 2010 05:40:46 +0000 (UTC) From: David Xu <davidxu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r201884 - head/lib/libc/gen Message-ID: <201001090540.o095ekeT008548@svn.freebsd.org>
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Author: davidxu Date: Sat Jan 9 05:40:46 2010 New Revision: 201884 URL: http://svn.freebsd.org/changeset/base/201884 Log: Update manual for sem_init and sem_open, restrictions of shared semaphore and 14 characters in name length no longer exist. Reviewed by: deischen@ Modified: head/lib/libc/gen/sem_init.3 head/lib/libc/gen/sem_open.3 Modified: head/lib/libc/gen/sem_init.3 ============================================================================== --- head/lib/libc/gen/sem_init.3 Sat Jan 9 04:59:57 2010 (r201883) +++ head/lib/libc/gen/sem_init.3 Sat Jan 9 05:40:46 2010 (r201884) @@ -46,9 +46,19 @@ function initializes the unnamed semapho .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 , Modified: head/lib/libc/gen/sem_open.3 ============================================================================== --- head/lib/libc/gen/sem_open.3 Sat Jan 9 04:59:57 2010 (r201883) +++ head/lib/libc/gen/sem_open.3 Sat Jan 9 05:40:46 2010 (r201884) @@ -58,6 +58,12 @@ The returned semaphore may be used in su 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.
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