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Add support for prlimit and prlimit64 on Linux.

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This commit is contained in:
Ulrich Drepper 2010-08-11 11:18:52 -07:00
parent 15bac72bac
commit c08fb0d7bb
12 changed files with 154 additions and 2 deletions
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16
ChangeLog
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@ -1,5 +1,21 @@
2010-08-11 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/Makefile [subdir=misc] (sysdep_routines):
Add prlimit.
* sysdeps/unix/sysv/linux/Versions [libc]: Export prlimit and
prlimit64 for GLIBC_2.13.
* sysdeps/unix/sysv/linux/bits/resource.h: Declare prlimit and
prlimit64.
* sysdeps/unix/sysv/linux/i386/syscalls.list: Add entry for prlimit64
syscall.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/sh/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/syscalls.lis: Likewise.
* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise. Also
add prlimit alias.
* sysdeps/unix/sysv/linux/prlimit.c: New file.
[BZ #11903]
* sysdeps/generic/netinet/ip.h (IPTOS_CLASS): Fix definition.
Patch by Evgeni Bikov <bikovevg@iitp.ru>.

2
NEWS
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@ -11,6 +11,8 @@ Version 2.13
11640, 11701, 11840, 11856, 11883, 11903
* New Linux interfaces: prlimit, prlimit64
* POWER7 optimizations: memset, memcmp, strncmp
* New optimized string functions for x86-64: strnlen, strcasecmp

2
sysdeps/unix/sysv/linux/Makefile
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@ -18,7 +18,7 @@ endif
ifeq ($(subdir),misc)
sysdep_routines += sysctl clone llseek umount umount2 readahead \
setfsuid setfsgid makedev epoll_pwait signalfd \
eventfd eventfd_read eventfd_write
eventfd eventfd_read eventfd_write prlimit
CFLAGS-gethostid.c = -fexceptions

3
sysdeps/unix/sysv/linux/Versions
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@ -149,6 +149,9 @@ libc {
recvmmsg;
}
GLIBC_2.13 {
prlimit; prlimit64;
}
GLIBC_PRIVATE {
# functions used in other libraries
__syscall_rt_sigqueueinfo;

30
sysdeps/unix/sysv/linux/bits/resource.h
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@ -1,5 +1,5 @@
/* Bit values & structures for resource limits. Linux version.
Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2004, 2005, 2008, 2009
Copyright (C) 1994, 1996-2000, 2004, 2005, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -232,3 +232,31 @@ enum __priority_which
PRIO_USER = 2 /* WHO is a user ID. */
#define PRIO_USER PRIO_USER
};
__BEGIN_DECLS
#ifdef __USE_GNU
/* Modify and return resource limits of a process atomically. */
# ifndef __USE_FILE_OFFSET64
extern int prlimit (__pid_t __pid, enum __rlimit_resource __resource,
__const struct rlimit *__new_limit,
struct rlimit *__old_limit) __THROW;
# else
# ifdef __REDIRECT_NTH
extern int __REDIRECT_NTH (prlimit, (__pid_t __pid,
enum __rlimit_resource __resource,
__const struct rlimit *__new_limit,
struct rlimit *__old_limit), prlimit64);
# else
# define prlimit prlimit64
# endif
# endif
# ifdef __USE_LARGEFILE64
extern int prlimit64 (__pid_t __pid, enum __rlimit_resource __resource,
__const struct rlimit64 *__new_limit,
struct rlimit64 *__old_limit) __THROW;
# endif
#endif
__END_DECLS

2
sysdeps/unix/sysv/linux/i386/syscalls.list
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@ -6,3 +6,5 @@ vm86 - vm86 i:ip __vm86 vm86@@GLIBC_2.3.4
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
waitpid - waitpid Ci:ipi __waitpid waitpid __libc_waitpid
prlimit64 EXTRA prlimit64 i:iipp prlimit64

2
sysdeps/unix/sysv/linux/powerpc/powerpc32/syscalls.list
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@ -6,3 +6,5 @@ oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
# Due to 64bit alignment there is a dummy second parameter
readahead - readahead i:iiiii __readahead readahead
prlimit64 EXTRA prlimit64 i:iipp prlimit64

92
sysdeps/unix/sysv/linux/prlimit.c Normal file
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@ -0,0 +1,92 @@
/* Copyright (C) 2010 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#ifdef __NR_prlimit64
int
prlimit (__pid_t pid, enum __rlimit_resource resource,
__const struct rlimit *new_limit, struct rlimit *old_limit)
{
struct rlimit64 new_rlimit64_mem;
struct rlimit64 *new_rlimit64 = NULL;
struct rlimit64 old_rlimit64_mem;
struct rlimit64 *old_rlimit64 = (old_rlimiit != NULL
? &old_rlimit64_mem : NULL);
if (new_rlimit != NULL)
{
if (new_rlimit->rlim_cur == RLIM_INFINITY)
new_rlimit64_mem.rlim_cur = RLIM64_INFINITY;
else
new_rlimit64_mem.rlim_cur = new_rlimit->rlim_cur;
if (new_rlimit->rlim_max == RLIM_INFINITY)
new_rlimit64_mem.rlim_max = = RLIM64_INFINITY;
else
new_rlimit64_mem.rlim_max = new_rlimit->rlim_max;
new_rlimit64 = &new_rlimit64_mem;
}
int res = INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit64,
old_rlimit64);
if (res == 0 && old_limit != NULL)
{
/* The prlimit64 syscall is ill-designed for 32-bit machines.
We have to provide a 32-bit variant since otherwise the LFS
system would not work. But what shall we do if the syscall
succeeds but the old values do not fit into a rlimit
structure? We cannot return an error because the operation
itself worked. Best is perhaps to return RLIM_INFINITY. */
old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur;
if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur)
{
if (new_limit == NULL)
{
__set_errno (EOVERFLOW);
return -1;
}
old_rlimit->rlim_cur = RLIM_INFINITY;
}
old_rlimit->rlim_max = old_rlimit64_mem.rlim_max;
if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max)
{
if (new_limit == NULL)
{
__set_errno (EOVERFLOW);
return -1;
}
old_rlimit->rlim_max = RLIM_INFINITY;
}
}
return res;
}
#else
int
prlimit (__pid_t pid, enum __rlimit_resource resource,
__const struct rlimit *new_limit, struct rlimit *old_limit)
{
__set_errno (ENOSYS);
return -1;
}
stub_warning (prlimit)
#endif

2
sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list
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@ -3,3 +3,5 @@
oldgetrlimit EXTRA getrlimit i:ip __old_getrlimit getrlimit@GLIBC_2.0
oldsetrlimit EXTRA setrlimit i:ip __old_setrlimit setrlimit@GLIBC_2.0
vfork - vfork 0 __vfork vfork
prlimit64 EXTRA prlimit64 i:iipp prlimit64

2
sysdeps/unix/sysv/linux/sh/syscalls.list
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@ -1,3 +1,5 @@
# File name Caller Syscall name # args Strong name Weak names
waitpid - waitpid Ci:ipi __waitpid waitpid __libc_waitpid
prlimit64 EXTRA prlimit64 i:iipp prlimit64

2
sysdeps/unix/sysv/linux/sparc/sparc32/syscalls.list
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@ -4,3 +4,5 @@ setrlimit - setrlimit 2 __setrlimit setrlimit
getrlimit - getrlimit 2 __getrlimit getrlimit
getresuid - getresuid32 3 getresuid
getresgid - getresgid32 3 getresgid
prlimit64 EXTRA prlimit64 i:iipp prlimit64

1
sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
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@ -17,3 +17,4 @@ sendfile - sendfile i:iipi sendfile sendfile64
sync_file_range - sync_file_range i:iiii sync_file_range
creat - creat Ci:si __libc_creat creat creat64
open - open Ci:siv __libc_open __open open __open64 open64
prlimit EXTRA prlimit64 i:iipp prlimit prlimit64