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Diffstat (limited to 'manual/llio.texi')
| -rw-r--r-- | manual/llio.texi | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/manual/llio.texi b/manual/llio.texi index dd0eaa3cb9..b6c926060e 100644 --- a/manual/llio.texi +++ b/manual/llio.texi @@ -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 |