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memorylost731
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linux_man_pages_library

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.tp
.b eacces
permission to
.br shm_unlink ()
the shared memory object was denied.
.tp
.b eacces
permission was denied to
.br shm_open ()
.i name
in the specified
.ir mode ,
or
.b o_trunc
was specified and the caller does not have write permission on the object.
.tp
.b eexist
both
.b o_creat
and
.b o_excl
were specified to
.br shm_open ()
and the shared memory object specified by
.i name
already exists.
.tp
.b einval
the
.i name
argument to
.br shm_open ()
was invalid.
.tp
.b emfile
the per-process limit on the number of open file descriptors has been reached.
.tp
.b enametoolong
the length of
.i name
exceeds
.br path_max .
.tp
.b enfile
the system-wide limit on the total number of open files has been reached.
.tp
.b enoent
an attempt was made to
.br shm_open ()
a
.i name
that did not exist, and
.b o_creat
was not specified.
.tp
.b enoent
an attempt was to made to
.br shm_unlink ()
a
.i name
that does not exist.
.sh versions
these functions are provided in glibc 2.2 and later.
.sh attributes
for an explanation of the terms used in this section, see
.br attributes (7).
.ad l
.nh
.ts
allbox;
lbx lb lb
l l l.
interface attribute value
t{
.br shm_open (),
.br shm_unlink ()
t} thread safety mt-safe locale
.te
.hy
.ad
.sp 1
.sh conforming to
posix.1-2001, posix.1-2008.
.pp
posix.1-2001 says that the group ownership of a newly created shared
memory object is set to either the calling process's effective group id
or "a system default group id".
posix.1-2008 says that the group ownership
may be set to either the calling process's effective group id
or, if the object is visible in the filesystem,
the group id of the parent directory.
.sh notes
posix leaves the behavior of the combination of
.b o_rdonly
and
.b o_trunc
unspecified.
on linux, this will successfully truncate an existing
shared memory object\(emthis may not be so on other unix systems.
.pp