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getrlimit.2: Added documentation of prlimit()
prlimit() is new in kernel 2.6.36. Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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man2/getrlimit.2
126
man2/getrlimit.2
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@ -1,7 +1,7 @@
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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Copyright (c) 1992 Drew Eckhardt, March 28, 1992
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.\" and Copyright (c) 2002, 2004, 2005, 2008 Michael Kerrisk
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.\" and Copyright (c) 2002, 2004, 2005, 2008. 2010 Michael Kerrisk
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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@ -37,7 +37,7 @@
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.\" Modified 2002-06-13 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Added note on nonstandard behavior when SIGCHLD is ignored.
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.\" Modified 2002-07-09 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Enhanced descriptions of 'resource' values for [gs]etrlimit()
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.\" Enhanced descriptions of 'resource' values
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.\" Modified 2003-11-28 by aeb, added RLIMIT_CORE
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.\" Modified 2004-03-26 by aeb, added RLIMIT_AS
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.\" Modified 2004-06-16 by Michael Kerrisk <mtk.manpages@gmail.com>
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@ -59,10 +59,11 @@
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.\" 2005-07-13, mtk, documented RLIMIT_MSGQUEUE limit.
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.\" 2005-07-28, mtk, Added descriptions of RLIMIT_NICE and RLIMIT_RTPRIO
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.\" 2008-05-07, mtk / Peter Zijlstra, Added description of RLIMIT_RTTIME
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.\" 2010-11-06, mtk: Added documentation of prlimit()
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.\"
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.TH GETRLIMIT 2 2010-09-26 "Linux" "Linux Programmer's Manual"
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.TH GETRLIMIT 2 2010-11-06 "Linux" "Linux Programmer's Manual"
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.SH NAME
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getrlimit, setrlimit \- get/set resource limits
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getrlimit, setrlimit, prlimit \- get/set resource limits
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.SH SYNOPSIS
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.B #include <sys/time.h>
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.br
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@ -71,7 +72,21 @@ getrlimit, setrlimit \- get/set resource limits
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.BI "int getrlimit(int " resource ", struct rlimit *" rlim );
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.br
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.BI "int setrlimit(int " resource ", const struct rlimit *" rlim );
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.sp
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.BI "int prlimit(pid_t " pid ", int " resource \
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", const struct rlimit *" new_limit ,
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.br
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.BI " struct rlimit *" old_limit );
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR prlimit ():
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_GNU_SOURCE
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.SH DESCRIPTION
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The
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.BR getrlimit ()
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and
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.BR setrlimit ()
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@ -361,43 +376,113 @@ Since Linux 2.6.23,
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this limit also determines the amount of space used for the process's
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command-line arguments and environment variables; for details, see
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.BR execve (2).
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.SH "RETURN VALUE"
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On success, zero is returned.
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.SS prlimit()
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.\" commit c022a0acad534fd5f5d5f17280f6d4d135e74e81
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.\" Author: Jiri Slaby <jslaby@suse.cz>
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.\" Date: Tue May 4 18:03:50 2010 +0200
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The Linux-specific
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.BR prlimit ()
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system call combines and extends the functionality of
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.BR setrlimit ()
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and
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.BR getrlimit ().
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It can be used to both set and get the resource limits of an arbitrary process.
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The
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.I resource
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argument has the same meaning as for
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.BR setrlimit ()
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and
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.BR getrlimit ().
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If the
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.IR new_limit
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argument is a not NULL, then the
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.I rlimit
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structure to which it points is used to set new values for
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the soft and hard limits for
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.IR resource .
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If the
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.IR old_limit
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argument is a not NULL, then a successful call to
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.BR prlimit ()
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places the previous soft and hard limits for
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.I resource
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in the
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.I rlimit
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structure pointed to by
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.IR old_limit .
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The
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.I pid
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argument specifies the ID of the process on which the call is to operate.
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If
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.I pid
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is 0, then the call applies to the calling process.
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To set or get the resources of a process other than itself,
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the caller must have the
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.B CAP_SYS_RESOURCE
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capability, or the
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real, effective, and saved set user IDs of the target process
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must match the real user ID of the caller
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.I and
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the real, effective, and saved set group IDs of the target process
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must match the real group ID of the caller.
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.\" FIXME this permission check is strange
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.\" Asked about this on LKML, 7 Nov 2010
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.\" "Inconsistent credential checking in prlimit() syscall"
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.SH RETURN VALUE
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On success, these system calls return 0.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EFAULT
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.I rlim
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points outside the accessible address space.
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A pointer argument points to a location
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outside the accessible address space.
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.TP
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.B EINVAL
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The value specified in
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.I resource
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is not valid;
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The value specified in
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or, for
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.BR setrlimit ():
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.BR setrlimit ()
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or
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.BR prlimit ():
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.I rlim\->rlim_cur
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was greater than
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.IR rlim\->rlim_max .
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.TP
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.B EPERM
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An unprivileged process tried to use
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.BR setrlimit ()
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to
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increase a soft or hard limit above the current hard limit; the
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An unprivileged process tried to raise the hard limit; the
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.B CAP_SYS_RESOURCE
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capability is required to do this.
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Or, the process tried to use
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.BR setrlimit ()
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to increase
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the soft or hard
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Or, the the caller tried to increase the hard
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.B RLIMIT_NOFILE
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limit above the current kernel
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maximum
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limit above the current kernel maximum
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.RB ( NR_OPEN ).
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Or, the calling process did not have permission to set limits
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for the process specified by
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.IR pid .
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.TP
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.B ESRCH
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Could not find a process with the ID specified in
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.IR pid .
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.SH VERSIONS
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.BR The
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.BR prlimit ()
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system call is available since Linux 2.6.36.
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Library support is available since glibc 2.13.
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.SH CONFORMING TO
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.BR getrlimit (),
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.BR setrlimit ():
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SVr4, 4.3BSD, POSIX.1-2001.
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.br
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.BR prlimit ():
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Linux-specific.
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.B RLIMIT_MEMLOCK
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and
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.B RLIMIT_NPROC
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@ -438,6 +523,9 @@ For backward compatibility, glibc also provides
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All new applications should be written using
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.BR setrlimit ().
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.SH BUGS
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.\" FIXME prlimit() does not suffer
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.\" https://bugzilla.kernel.org/show_bug.cgi?id=5042
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.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=12201
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In older Linux kernels, the
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.B SIGXCPU
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and
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