mirror of
https://sourceware.org/git/glibc.git
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Implement the mlock2 function
Fallback using mlock is provided if the flags argument is zero. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
parent
a23aa5b727
commit
4bab02240e
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2017-11-27 Florian Weimer <fweimer@redhat.com>
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* sysdeps/unix/sysv/linux/mlock2.c: New file.
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* sysdeps/unix/sysv/linux/tst-mlock2.c: Likewise.
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* sysdeps/unix/sysv/linux/Makefile (routines): Add mlock2.
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(tests): Add tst-mlock2.
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* sysdeps/unix/sysv/linux/Versions (GLIBC_2.27): Export mlock2.
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* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_MLOCK2)
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[__LINUX_KERNEL_VERSION >= 4.4]: Define.
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* sysdeps/unix/sysv/linux/libc**.abilist: Update.
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* manual/memory.texi (Page Lock Functions): Move @end deftypefun
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for mlock. Document mlock2.
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2017-11-27 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/ia64/Makeconfig (float64x-alias-fcts): New variable.
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2
NEWS
2
NEWS
@ -41,7 +41,7 @@ Major new features:
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18661-3:2015. These are corresponding interfaces to those supported for
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_Float128.
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* glibc now implements the memfd_create function on Linux.
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* glibc now implements the memfd_create and mlock2 functions on Linux.
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Deprecated and removed features, and other changes affecting compatibility:
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@ -3337,6 +3337,36 @@ The calling process is not superuser.
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The kernel does not provide @code{mlock} capability.
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@end table
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@end deftypefun
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@deftypefun int mlock2 (const void *@var{addr}, size_t @var{len}, unsigned int @var{flags})
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@standards{Linux, sys/mman.h}
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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This function is similar to @code{mlock}. If @var{flags} is zero, a
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call to @code{mlock2} behaves exactly as the equivalent call to @code{mlock}.
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The @var{flags} argument must be a combination of zero or more of the
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following flags:
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@vtable @code
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@item MLOCK_ONFAULT
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@standards{Linux, sys/mman.h}
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Only those pages in the specified address range which are already in
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memory are locked immediately. Additional pages in the range are
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automatically locked in case of a page fault and allocation of memory.
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@end vtable
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Like @code{mlock}, @code{mlock2} returns zero on success and @code{-1}
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on failure, setting @code{errno} accordingly. Additional @code{errno}
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values defined for @code{mlock2} are:
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@table @code
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@item EINVAL
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The specified (non-zero) @var{flags} argument is not supported by this
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system.
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@end table
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@end deftypefun
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You can lock @emph{all} a process' memory with @code{mlockall}. You
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unlock memory with @code{munlock} or @code{munlockall}.
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@ -3346,8 +3376,6 @@ To avoid all page faults in a C program, you have to use
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from the C code, e.g. the stack and automatic variables, and you
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wouldn't know what address to tell @code{mlock}.
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@end deftypefun
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@deftypefun int munlock (const void *@var{addr}, size_t @var{len})
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@standards{POSIX.1b, sys/mman.h}
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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@ -18,7 +18,7 @@ sysdep_routines += clone umount umount2 readahead \
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setfsuid setfsgid epoll_pwait signalfd \
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eventfd eventfd_read eventfd_write prlimit \
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personality epoll_wait tee vmsplice splice \
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open_by_handle_at
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open_by_handle_at mlock2
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CFLAGS-gethostid.c = -fexceptions
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CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables
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@ -44,7 +44,7 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
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tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
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tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
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test-errno-linux tst-memfd_create
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test-errno-linux tst-memfd_create tst-mlock2
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# Generate the list of SYS_* macros for the system calls (__NR_*
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# macros). The file syscall-names.list contains all possible system
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@ -168,6 +168,7 @@ libc {
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}
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GLIBC_2.27 {
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memfd_create;
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mlock2;
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}
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GLIBC_PRIVATE {
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# functions used in other libraries
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@ -2107,6 +2107,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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@ -2018,6 +2018,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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@ -108,6 +108,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.4 GLIBC_2.4 A
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GLIBC_2.4 _Exit F
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GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
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@ -28,12 +28,21 @@
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# define MFD_HUGETLB 4U
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# endif
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/* Flags for mlock2. */
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# ifndef MLOCK_ONFAULT
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# define MLOCK_ONFAULT 1U
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# endif
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__BEGIN_DECLS
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/* Create a new memory file descriptor. NAME is a name for debugging.
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FLAGS is a combination of the MFD_* constants. */
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int memfd_create (const char *__name, unsigned int __flags) __THROW;
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/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
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memory. FLAGS is a combination of the MLOCK_* flags above. */
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int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW;
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__END_DECLS
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#endif /* __USE_GNU */
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@ -1872,6 +1872,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2037,6 +2037,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof64x F
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GLIBC_2.27 strtof64x_l F
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@ -1901,6 +1901,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof64x F
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GLIBC_2.27 strtof64x_l F
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@ -107,3 +107,7 @@
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#if __LINUX_KERNEL_VERSION >= 0x031300
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# define __ASSUME_EXECVEAT 1
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#endif
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#if __LINUX_KERNEL_VERSION >= 0x040400
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# define __ASSUME_MLOCK2 1
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#endif
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@ -109,6 +109,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.4 GLIBC_2.4 A
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GLIBC_2.4 _Exit F
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GLIBC_2.4 _IO_2_1_stderr_ D 0x98
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@ -1986,6 +1986,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2107,3 +2107,4 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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@ -1961,6 +1961,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1959,6 +1959,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1957,6 +1957,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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@ -1952,6 +1952,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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40
sysdeps/unix/sysv/linux/mlock2.c
Normal file
40
sysdeps/unix/sysv/linux/mlock2.c
Normal file
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/* Wrapper for the mlock2 system call with fallback to mlock.
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Copyright (C) 2017 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/mman.h>
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#include <errno.h>
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#include <sysdep.h>
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int
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mlock2 (const void *addr, size_t length, unsigned int flags)
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{
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#ifdef __ASSUME_MLOCK2
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return INLINE_SYSCALL_CALL (mlock2, addr, length, flags);
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#else
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if (flags == 0)
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return INLINE_SYSCALL_CALL (mlock, addr, length);
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# ifdef __NR_mlock2
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int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags);
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if (ret == 0 || errno != ENOSYS)
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return ret;
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# endif /* __NR_mlock2 */
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/* Treat the missing system call as an invalid (non-zero) flag
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argument. */
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__set_errno (EINVAL);
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return -1;
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#endif /* __ASSUME_MLOCK2 */
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}
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@ -2148,3 +2148,4 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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@ -1990,6 +1990,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -1995,6 +1995,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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@ -2202,6 +2202,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof64x F
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GLIBC_2.27 strtof64x_l F
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@ -109,6 +109,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 _Exit F
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GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
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@ -1990,6 +1990,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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@ -1891,6 +1891,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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|
@ -1876,6 +1876,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.3 GLIBC_2.3 A
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GLIBC_2.3 __ctype_b_loc F
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GLIBC_2.3 __ctype_tolower_loc F
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|
@ -1983,6 +1983,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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|
@ -1920,6 +1920,7 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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GLIBC_2.27 strfromf128 F
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GLIBC_2.27 strfromf64x F
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GLIBC_2.27 strtof128 F
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@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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|
@ -2114,3 +2114,4 @@ GLIBC_2.27 GLIBC_2.27 A
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GLIBC_2.27 glob F
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GLIBC_2.27 glob64 F
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GLIBC_2.27 memfd_create F
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GLIBC_2.27 mlock2 F
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|
66
sysdeps/unix/sysv/linux/tst-mlock2.c
Normal file
66
sysdeps/unix/sysv/linux/tst-mlock2.c
Normal file
@ -0,0 +1,66 @@
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/* Test the mlock2 function.
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||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
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|
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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.
|
||||
|
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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
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <support/check.h>
|
||||
#include <support/xunistd.h>
|
||||
#include <sys/mman.h>
|
||||
|
||||
/* 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 <support/test-driver.c>
|
@ -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
|
||||
|
@ -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
|
||||
|
Loading…
Reference in New Issue
Block a user