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This commit is contained in:
Michael Kerrisk 2008-08-06 20:45:26 +00:00
parent f36903108a
commit 9fcbe835d8
1 changed files with 18 additions and 17 deletions
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35
man2/shmctl.2
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@ -104,7 +104,7 @@ Valid values for
.I cmd .I cmd
are: are:
.br .br
.TP 12 .TP 10
.B IPC_STAT .B IPC_STAT
Copy information from the kernel data structure associated with Copy information from the kernel data structure associated with
.I shmid .I shmid
@ -151,7 +151,7 @@ will be set.
.PP .PP
The caller \fImust\fP ensure that a segment is eventually destroyed; The caller \fImust\fP ensure that a segment is eventually destroyed;
otherwise its pages that were faulted in will remain in memory or swap. otherwise its pages that were faulted in will remain in memory or swap.
.TP .TP 10
.BR IPC_INFO " (Linux-specific)" .BR IPC_INFO " (Linux-specific)"
Returns information about system-wide shared memory limits and Returns information about system-wide shared memory limits and
parameters in the structure pointed to by parameters in the structure pointed to by
@ -169,11 +169,12 @@ feature test macro is defined:
struct shminfo { struct shminfo {
unsigned long shmmax; /* Maximum segment size */ unsigned long shmmax; /* Maximum segment size */
unsigned long shmmin; /* Minimum segment size; always 1 */ unsigned long shmmin; /* Minimum segment size;
always 1 */
unsigned long shmmni; /* Maximum number of segments */ unsigned long shmmni; /* Maximum number of segments */
unsigned long shmseg; /* Maximum number of segments that unsigned long shmseg; /* Maximum number of segments
a process can attach; unused that a process can attach;
within kernel */ unused within kernel */
unsigned long shmall; /* Maximum number of pages of unsigned long shmall; /* Maximum number of pages of
shared memory, system-wide */ shared memory, system-wide */
}; };
@ -205,18 +206,18 @@ feature test macro is defined:
.in +4n .in +4n
struct shm_info { struct shm_info {
int used_ids; /* # of currently existing int used_ids;/* # of currently existing
segments */ segments */
unsigned long shm_tot; /* Total number of shared unsigned long shm_tot; /* Total number of shared
memory pages */ memory pages */
unsigned long shm_rss; /* # of resident shared unsigned long shm_rss; /* # of resident shared
memory pages */ memory pages */
unsigned long shm_swp; /* # of swapped shared unsigned long shm_swp; /* # of swapped shared
memory pages */ memory pages */
unsigned long swap_attempts; unsigned long swap_attempts;
/* Unused since Linux 2.4 */ /* Unused since Linux 2.4 */
unsigned long swap_successes; unsigned long swap_successes;
/* Unused since Linux 2.4 */ /* Unused since Linux 2.4 */
}; };
.in .in
.fi .fi
@ -235,7 +236,7 @@ all shared memory segments on the system.
The caller can prevent or allow swapping of a shared The caller can prevent or allow swapping of a shared
memory segment with the following \fIcmd\fP values: memory segment with the following \fIcmd\fP values:
.br .br
.TP 12 .TP 10
.BR SHM_LOCK " (Linux-specific)" .BR SHM_LOCK " (Linux-specific)"
Prevent swapping of the shared memory segment. Prevent swapping of the shared memory segment.
The caller must fault in The caller must fault in