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Document shm_open.

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Ondřej Bílka 2013-12-02 23:32:42 +01:00
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@ -1,3 +1,7 @@
2013-12-02 Ondřej Bílka <neleai@seznam.cz>
* manual/llio.texi (Memory-mapped I/O): Add shm_open and shm_close.
2013-12-02 Steve Ellcey <sellcey@mips.com>
* benchtests/Makefile (bench): Add sqrt.

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manual/llio.texi
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@ -1471,6 +1471,33 @@ There is no existing mapping in at least part of the given region.
@end table
@end deftypefun
@comment sys/mman.h
@comment POSIX
@deftypefn Function int shm_open (const char *@var{name}, int @var{oflag}, mode_t @var{mode})
This function returns a file descriptor that can be used to allocate shared
memory via mmap. Unrelated processes can use same @var{name} to create or
open existing shared memory objects.
A @var{name} argument specifies the shared memory object to be opened.
In @theglibc{} it must be a string smaller than @code{NAME_MAX} bytes starting
with an optional slash but containing no other slashes.
The semantics of @var{oflag} and @var{mode} arguments is same as in @code{open}.
@code{shm_open} returns the file descriptor on success or @math{-1} on error.
On failure @code{errno} is set.
@end deftypefn
@deftypefn Function int shm_unlink (const char *@var{name})
This function is inverse of @code{shm_open} and removes the object with
the given @var{name} previously created by @code{shm_open}.
@code{shm_unlink} returns @math{0} on success or @math{-1} on error.
On failure @code{errno} is set.
@end deftypefn
@node Waiting for I/O
@section Waiting for Input or Output
@cindex waiting for input or output