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Added (brief) description of SHM_HUGETLB.

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Michael Kerrisk 2005-10-26 10:31:14 +00:00
parent 75cad98162
commit eb57338fe9
1 changed files with 16 additions and 1 deletions
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17
man2/shmget.2
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@ -109,7 +109,12 @@ meaning, as the
argument of argument of
.BR open (2). .BR open (2).
Presently, the execute permissions are not used by the system. Presently, the execute permissions are not used by the system.
.\" FIXME -- document SHM_HUGETLB -- see Documentation/vm/hugetlbpage.txt .TP
.B SHM_HUGETLB
Allocate the segment using "huge pages."
See the kernel source file
.I Documentation/vm/hugetlbpage.txt
for further information.
.PP .PP
If a new shared memory segment is created, If a new shared memory segment is created,
then its associated data structure then its associated data structure
@ -212,6 +217,13 @@ or allocating a segment of the requested
.I size .I size
would cause the system to exceed the system-wide limit on shared memory would cause the system to exceed the system-wide limit on shared memory
.RB ( SHMALL ). .RB ( SHMALL ).
.TP
.B EPERM
The
.B SHM_HUGETLB
flag was specified, but the caller was not privileged (did not have the
.B CAP_IPC_LOCK
capability).
.SH NOTES .SH NOTES
.B IPC_PRIVATE .B IPC_PRIVATE
isn't a flag field but a isn't a flag field but a
@ -261,6 +273,9 @@ SVr4, SVID. SVr4 documents an additional error condition EEXIST.
Until version 2.3.30 Linux would return EIDRM for a Until version 2.3.30 Linux would return EIDRM for a
.BR shmget () .BR shmget ()
on a shared memory segment scheduled for deletion. on a shared memory segment scheduled for deletion.
.B SHM_HUGETLB
is a non-portable Linux extension.
.SH "SEE ALSO" .SH "SEE ALSO"
.BR shmat (2), .BR shmat (2),
.BR shmctl (2), .BR shmctl (2),