* [PATCH] Remove CHILD_MAX
@ 2007-03-13 8:42 Roland McGrath
0 siblings, 0 replies; 2+ messages in thread
From: Roland McGrath @ 2007-03-13 8:42 UTC (permalink / raw)
To: Linus Torvalds, Andrew Morton; +Cc: linux-kernel
The CHILD_MAX macro in limits.h should not be there. It claims to be the
limit on processes a user can own, but its value is wrong for that.
There is no constant value, but a variable resource limit (RLIMIT_NPROC).
Nothing in the kernel uses CHILD_MAX.
The proper thing to do according to POSIX is not to define CHILD_MAX at all.
The sysconf (_SC_CHILD_MAX) implementation works by calling getrlimit.
Signed-off-by: Roland McGrath <roland@redhat.com>
---
include/linux/limits.h | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/include/linux/limits.h b/include/linux/limits.h
index c4b4e57..2d0f941 100644
--- a/include/linux/limits.h
+++ b/include/linux/limits.h
@@ -5,7 +5,6 @@
#define NGROUPS_MAX 65536 /* supplemental group IDs are available */
#define ARG_MAX 131072 /* # bytes of args + environ for exec() */
-#define CHILD_MAX 999 /* no limit :-) */
#define LINK_MAX 127 /* # links a file may have */
#define MAX_CANON 255 /* size of the canonical input queue */
#define MAX_INPUT 255 /* size of the type-ahead buffer */
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] Remove CHILD_MAX
@ 2007-07-12 1:01 Roland McGrath
0 siblings, 0 replies; 2+ messages in thread
From: Roland McGrath @ 2007-07-12 1:01 UTC (permalink / raw)
To: Andrew Morton, Linus Torvalds; +Cc: linux-kernel
The CHILD_MAX macro in limits.h should not be there. It claims to be the
limit on processes a user can own, but its value is wrong for that.
There is no constant value, but a variable resource limit (RLIMIT_NPROC).
Nothing in the kernel uses CHILD_MAX.
The proper thing to do according to POSIX is not to define CHILD_MAX at all.
The sysconf (_SC_CHILD_MAX) implementation works by calling getrlimit.
Signed-off-by: Roland McGrath <roland@redhat.com>
---
include/linux/limits.h | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/include/linux/limits.h b/include/linux/limits.h
index c4b4e57..2d0f941 100644
--- a/include/linux/limits.h
+++ b/include/linux/limits.h
@@ -5,7 +5,6 @@
#define NGROUPS_MAX 65536 /* supplemental group IDs are available */
#define ARG_MAX 131072 /* # bytes of args + environ for exec() */
-#define CHILD_MAX 999 /* no limit :-) */
#define LINK_MAX 127 /* # links a file may have */
#define MAX_CANON 255 /* size of the canonical input queue */
#define MAX_INPUT 255 /* size of the type-ahead buffer */
^ permalink raw reply related [flat|nested] 2+ messages in thread
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