From 4bab02240e9076b49702b30bb8a1d23a0afe58cb Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Mon, 27 Nov 2017 17:14:29 +0100 Subject: Implement the mlock2 function Fallback using mlock is provided if the flags argument is zero. Reviewed-by: Adhemerval Zanella --- ChangeLog | 13 +++++ NEWS | 2 +- manual/memory.texi | 32 ++++++++++- sysdeps/unix/sysv/linux/Makefile | 4 +- sysdeps/unix/sysv/linux/Versions | 1 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/libc.abilist | 1 + sysdeps/unix/sysv/linux/bits/mman-shared.h | 9 +++ sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 + sysdeps/unix/sysv/linux/kernel-features.h | 4 ++ sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist | 1 + sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + sysdeps/unix/sysv/linux/microblaze/libc.abilist | 1 + .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../unix/sysv/linux/mips/mips32/nofpu/libc.abilist | 1 + .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/mlock2.c | 40 +++++++++++++ sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + .../sysv/linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 + .../sysv/linux/powerpc/powerpc64/libc-le.abilist | 1 + .../unix/sysv/linux/powerpc/powerpc64/libc.abilist | 1 + sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist | 1 + sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/libc.abilist | 1 + sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist | 1 + sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist | 1 + .../sysv/linux/tile/tilegx/tilegx32/libc.abilist | 1 + .../sysv/linux/tile/tilegx/tilegx64/libc.abilist | 1 + sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist | 1 + sysdeps/unix/sysv/linux/tst-mlock2.c | 66 ++++++++++++++++++++++ sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 + sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 37 files changed, 194 insertions(+), 5 deletions(-) create mode 100644 sysdeps/unix/sysv/linux/mlock2.c create mode 100644 sysdeps/unix/sysv/linux/tst-mlock2.c diff --git a/ChangeLog b/ChangeLog index 389e39e..b7779c6 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,16 @@ +2017-11-27 Florian Weimer + + * sysdeps/unix/sysv/linux/mlock2.c: New file. + * sysdeps/unix/sysv/linux/tst-mlock2.c: Likewise. + * sysdeps/unix/sysv/linux/Makefile (routines): Add mlock2. + (tests): Add tst-mlock2. + * sysdeps/unix/sysv/linux/Versions (GLIBC_2.27): Export mlock2. + * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_MLOCK2) + [__LINUX_KERNEL_VERSION >= 4.4]: Define. + * sysdeps/unix/sysv/linux/libc**.abilist: Update. + * manual/memory.texi (Page Lock Functions): Move @end deftypefun + for mlock. Document mlock2. + 2017-11-27 Joseph Myers * sysdeps/ia64/Makeconfig (float64x-alias-fcts): New variable. diff --git a/NEWS b/NEWS index 33c62ab..f3fdf9a 100644 --- a/NEWS +++ b/NEWS @@ -41,7 +41,7 @@ Major new features: 18661-3:2015. These are corresponding interfaces to those supported for _Float128. -* glibc now implements the memfd_create function on Linux. +* glibc now implements the memfd_create and mlock2 functions on Linux. Deprecated and removed features, and other changes affecting compatibility: diff --git a/manual/memory.texi b/manual/memory.texi index 3f5dd90..1b431bf 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -3337,6 +3337,36 @@ The calling process is not superuser. The kernel does not provide @code{mlock} capability. @end table +@end deftypefun + +@deftypefun int mlock2 (const void *@var{addr}, size_t @var{len}, unsigned int @var{flags}) +@standards{Linux, sys/mman.h} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} + +This function is similar to @code{mlock}. If @var{flags} is zero, a +call to @code{mlock2} behaves exactly as the equivalent call to @code{mlock}. + +The @var{flags} argument must be a combination of zero or more of the +following flags: + +@vtable @code +@item MLOCK_ONFAULT +@standards{Linux, sys/mman.h} +Only those pages in the specified address range which are already in +memory are locked immediately. Additional pages in the range are +automatically locked in case of a page fault and allocation of memory. +@end vtable + +Like @code{mlock}, @code{mlock2} returns zero on success and @code{-1} +on failure, setting @code{errno} accordingly. Additional @code{errno} +values defined for @code{mlock2} are: + +@table @code +@item EINVAL +The specified (non-zero) @var{flags} argument is not supported by this +system. +@end table +@end deftypefun You can lock @emph{all} a process' memory with @code{mlockall}. You unlock memory with @code{munlock} or @code{munlockall}. @@ -3346,8 +3376,6 @@ To avoid all page faults in a C program, you have to use from the C code, e.g. the stack and automatic variables, and you wouldn't know what address to tell @code{mlock}. -@end deftypefun - @deftypefun int munlock (const void *@var{addr}, size_t @var{len}) @standards{POSIX.1b, sys/mman.h} @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 58ce07b5..478f7e3 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -18,7 +18,7 @@ sysdep_routines += clone umount umount2 readahead \ setfsuid setfsgid epoll_pwait signalfd \ eventfd eventfd_read eventfd_write prlimit \ personality epoll_wait tee vmsplice splice \ - open_by_handle_at + open_by_handle_at mlock2 CFLAGS-gethostid.c = -fexceptions CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables @@ -44,7 +44,7 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \ tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \ - test-errno-linux tst-memfd_create + test-errno-linux tst-memfd_create tst-mlock2 # Generate the list of SYS_* macros for the system calls (__NR_* # macros). The file syscall-names.list contains all possible system diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index 6f2fe51..e799b62 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -168,6 +168,7 @@ libc { } GLIBC_2.27 { memfd_create; + mlock2; } GLIBC_PRIVATE { # functions used in other libraries diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index af60b4f..3448d62 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2107,6 +2107,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 98c6a17..d064f54 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2018,6 +2018,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist index 8a8af3e..a5ce796 100644 --- a/sysdeps/unix/sysv/linux/arm/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist @@ -108,6 +108,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.4 GLIBC_2.4 A GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0xa0 diff --git a/sysdeps/unix/sysv/linux/bits/mman-shared.h b/sysdeps/unix/sysv/linux/bits/mman-shared.h index 5bbcbbc..bee99c2 100644 --- a/sysdeps/unix/sysv/linux/bits/mman-shared.h +++ b/sysdeps/unix/sysv/linux/bits/mman-shared.h @@ -28,12 +28,21 @@ # define MFD_HUGETLB 4U # endif +/* Flags for mlock2. */ +# ifndef MLOCK_ONFAULT +# define MLOCK_ONFAULT 1U +# endif + __BEGIN_DECLS /* Create a new memory file descriptor. NAME is a name for debugging. FLAGS is a combination of the MFD_* constants. */ int memfd_create (const char *__name, unsigned int __flags) __THROW; +/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into + memory. FLAGS is a combination of the MLOCK_* flags above. */ +int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW; + __END_DECLS #endif /* __USE_GNU */ diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 5b81a6c..69ddf15 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -1872,6 +1872,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 1526778..a140edd 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2037,6 +2037,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof64x F GLIBC_2.27 strtof64x_l F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 132200f..178c0a4 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -1901,6 +1901,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof64x F GLIBC_2.27 strtof64x_l F diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index 2e1fe65..59b6133 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -107,3 +107,7 @@ #if __LINUX_KERNEL_VERSION >= 0x031300 # define __ASSUME_EXECVEAT 1 #endif + +#if __LINUX_KERNEL_VERSION >= 0x040400 +# define __ASSUME_MLOCK2 1 +#endif diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index d9c9777..01d10d9 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -109,6 +109,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.4 GLIBC_2.4 A GLIBC_2.4 _Exit F GLIBC_2.4 _IO_2_1_stderr_ D 0x98 diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 4acbf7e..3ad08c2 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -1986,6 +1986,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist index 93f02f0..6bd7be1 100644 --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist @@ -2107,3 +2107,4 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 795e85d..9b1e890 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -1961,6 +1961,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index dc71405..3eb5b66 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -1959,6 +1959,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index 6ec940e..543a725 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -1957,6 +1957,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 71062b0..a9198a3 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -1952,6 +1952,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/mlock2.c b/sysdeps/unix/sysv/linux/mlock2.c new file mode 100644 index 0000000..1686ab9 --- /dev/null +++ b/sysdeps/unix/sysv/linux/mlock2.c @@ -0,0 +1,40 @@ +/* Wrapper for the mlock2 system call with fallback to mlock. + Copyright (C) 2017 Free Software Foundation, Inc. + + 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, see + . */ + +#include +#include +#include + +int +mlock2 (const void *addr, size_t length, unsigned int flags) +{ +#ifdef __ASSUME_MLOCK2 + return INLINE_SYSCALL_CALL (mlock2, addr, length, flags); +#else + if (flags == 0) + return INLINE_SYSCALL_CALL (mlock, addr, length); +# ifdef __NR_mlock2 + int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags); + if (ret == 0 || errno != ENOSYS) + return ret; +# endif /* __NR_mlock2 */ + /* Treat the missing system call as an invalid (non-zero) flag + argument. */ + __set_errno (EINVAL); + return -1; +#endif /* __ASSUME_MLOCK2 */ +} diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 3e0bcb2..afacf1f 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2148,3 +2148,4 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 375c69d..48af097 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -1990,6 +1990,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index a88172a..e30535d 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -1995,6 +1995,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist index a00f904..f522700 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist @@ -2202,6 +2202,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof64x F GLIBC_2.27 strtof64x_l F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist index 838f395..d3092af 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist @@ -109,6 +109,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 _Exit F GLIBC_2.3 _IO_2_1_stderr_ D 0xe0 diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index b7dbfaa..7521761 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -1990,6 +1990,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 1175cd7..b6d4c73 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -1891,6 +1891,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist index bc1aae2..1ee21fe 100644 --- a/sysdeps/unix/sysv/linux/sh/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist @@ -1876,6 +1876,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.3 GLIBC_2.3 A GLIBC_2.3 __ctype_b_loc F GLIBC_2.3 __ctype_tolower_loc F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 899d5ff..e652191 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -1983,6 +1983,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index fbe0e51..37cf871 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -1920,6 +1920,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf128 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof128 F diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist index e9eb4ff..57427eb 100644 --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist @@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist index 8f08e90..321f65c 100644 --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist @@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist index e9eb4ff..57427eb 100644 --- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist +++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist @@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F diff --git a/sysdeps/unix/sysv/linux/tst-mlock2.c b/sysdeps/unix/sysv/linux/tst-mlock2.c new file mode 100644 index 0000000..53c435a --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-mlock2.c @@ -0,0 +1,66 @@ +/* Test the mlock2 function. + Copyright (C) 2017 Free Software Foundation, Inc. + + 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, see + . */ + +#include +#include +#include +#include +#include + +/* Allocate a page using mmap. */ +static void * +get_page (void) +{ + return xmmap (NULL, 1, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1); +} + +static int +do_test (void) +{ + /* Current kernels have a small reserve of locked memory, so this + test does not need any privileges to run. */ + + void *page = get_page (); + if (mlock (page, 1) != 0) + FAIL_EXIT1 ("mlock: %m\n"); + xmunmap (page, 1); + + page = get_page (); + if (mlock2 (page, 1, 0) != 0) + /* Should be implemented using mlock if necessary. */ + FAIL_EXIT1 ("mlock2 (0): %m\n"); + xmunmap (page, 1); + + page = get_page (); + int ret = mlock2 (page, 1, MLOCK_ONFAULT); + if (ret != 0) + { + TEST_VERIFY (ret == -1); + if (errno != EINVAL) + /* EINVAL means the system does not support the mlock2 system + call. */ + FAIL_EXIT1 ("mlock2 (0): %m\n"); + else + puts ("warning: mlock2 system call not supported"); + } + xmunmap (page, 1); + + return 0; +} + +#include diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 9c4b53b..f26c8b9 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -1878,6 +1878,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof64x F GLIBC_2.27 strtof64x_l F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index 7a179a5..2a60571 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2121,6 +2121,7 @@ GLIBC_2.27 GLIBC_2.27 A GLIBC_2.27 glob F GLIBC_2.27 glob64 F GLIBC_2.27 memfd_create F +GLIBC_2.27 mlock2 F GLIBC_2.27 strfromf64x F GLIBC_2.27 strtof64x F GLIBC_2.27 strtof64x_l F -- cgit v1.1