parent
e1b2970d28
commit
145f3cd173
5
INSTALL
5
INSTALL
@ -206,6 +206,11 @@ any of the following arguments (not a definitive list) to 'configure':
|
|||||||
most extreme case increases physical memory usage for the 16 KiB size class
|
most extreme case increases physical memory usage for the 16 KiB size class
|
||||||
to 20 KiB.
|
to 20 KiB.
|
||||||
|
|
||||||
|
--disable-syscall
|
||||||
|
Disable use of syscall(2) rather than {open,read,write,close}(2). This is
|
||||||
|
intended as a workaround for systems that place security limitations on
|
||||||
|
syscall(2).
|
||||||
|
|
||||||
--with-xslroot=<path>
|
--with-xslroot=<path>
|
||||||
Specify where to find DocBook XSL stylesheets when building the
|
Specify where to find DocBook XSL stylesheets when building the
|
||||||
documentation.
|
documentation.
|
||||||
|
29
configure.ac
29
configure.ac
@ -1396,20 +1396,33 @@ if test "x${je_cv_mach_absolute_time}" = "xyes" ; then
|
|||||||
AC_DEFINE([JEMALLOC_HAVE_MACH_ABSOLUTE_TIME])
|
AC_DEFINE([JEMALLOC_HAVE_MACH_ABSOLUTE_TIME])
|
||||||
fi
|
fi
|
||||||
|
|
||||||
dnl Check if syscall(2) is usable. Treat warnings as errors, so that e.g. OS X
|
dnl Use syscall(2) (if available) by default.
|
||||||
dnl 10.12's deprecation warning prevents use.
|
AC_ARG_ENABLE([syscall],
|
||||||
SAVED_CFLAGS="${CFLAGS}"
|
[AS_HELP_STRING([--disable-syscall], [Disable use of syscall(2)])],
|
||||||
JE_CFLAGS_APPEND([-Werror])
|
[if test "x$enable_syscall" = "xno" ; then
|
||||||
JE_COMPILABLE([syscall(2)], [
|
enable_syscall="0"
|
||||||
|
else
|
||||||
|
enable_syscall="1"
|
||||||
|
fi
|
||||||
|
],
|
||||||
|
[enable_syscall="1"]
|
||||||
|
)
|
||||||
|
if test "x$enable_syscall" = "x1" ; then
|
||||||
|
dnl Check if syscall(2) is usable. Treat warnings as errors, so that e.g. OS
|
||||||
|
dnl X 10.12's deprecation warning prevents use.
|
||||||
|
SAVED_CFLAGS="${CFLAGS}"
|
||||||
|
JE_CFLAGS_APPEND([-Werror])
|
||||||
|
JE_COMPILABLE([syscall(2)], [
|
||||||
#include <sys/syscall.h>
|
#include <sys/syscall.h>
|
||||||
#include <unistd.h>
|
#include <unistd.h>
|
||||||
], [
|
], [
|
||||||
syscall(SYS_write, 2, "hello", 5);
|
syscall(SYS_write, 2, "hello", 5);
|
||||||
],
|
],
|
||||||
[je_cv_syscall])
|
[je_cv_syscall])
|
||||||
CFLAGS="${SAVED_CFLAGS}"
|
CFLAGS="${SAVED_CFLAGS}"
|
||||||
if test "x$je_cv_syscall" = "xyes" ; then
|
if test "x$je_cv_syscall" = "xyes" ; then
|
||||||
AC_DEFINE([JEMALLOC_HAVE_SYSCALL], [ ])
|
AC_DEFINE([JEMALLOC_USE_SYSCALL], [ ])
|
||||||
|
fi
|
||||||
fi
|
fi
|
||||||
|
|
||||||
dnl Check if the GNU-specific secure_getenv function exists.
|
dnl Check if the GNU-specific secure_getenv function exists.
|
||||||
|
@ -66,8 +66,8 @@
|
|||||||
*/
|
*/
|
||||||
#undef JEMALLOC_OSSPIN
|
#undef JEMALLOC_OSSPIN
|
||||||
|
|
||||||
/* Defined if syscall(2) is available. */
|
/* Defined if syscall(2) is usable. */
|
||||||
#undef JEMALLOC_HAVE_SYSCALL
|
#undef JEMALLOC_USE_SYSCALL
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Defined if secure_getenv(3) is available.
|
* Defined if secure_getenv(3) is available.
|
||||||
|
@ -248,7 +248,7 @@ os_overcommits_proc(void)
|
|||||||
char buf[1];
|
char buf[1];
|
||||||
ssize_t nread;
|
ssize_t nread;
|
||||||
|
|
||||||
#if defined(JEMALLOC_HAVE_SYSCALL) && defined(SYS_open)
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
|
||||||
fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
|
fd = (int)syscall(SYS_open, "/proc/sys/vm/overcommit_memory", O_RDONLY);
|
||||||
#else
|
#else
|
||||||
fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
|
fd = open("/proc/sys/vm/overcommit_memory", O_RDONLY);
|
||||||
@ -256,13 +256,13 @@ os_overcommits_proc(void)
|
|||||||
if (fd == -1)
|
if (fd == -1)
|
||||||
return (false); /* Error. */
|
return (false); /* Error. */
|
||||||
|
|
||||||
#if defined(JEMALLOC_HAVE_SYSCALL) && defined(SYS_read)
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_read)
|
||||||
nread = (ssize_t)syscall(SYS_read, fd, &buf, sizeof(buf));
|
nread = (ssize_t)syscall(SYS_read, fd, &buf, sizeof(buf));
|
||||||
#else
|
#else
|
||||||
nread = read(fd, &buf, sizeof(buf));
|
nread = read(fd, &buf, sizeof(buf));
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
#if defined(JEMALLOC_HAVE_SYSCALL) && defined(SYS_close)
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
|
||||||
syscall(SYS_close, fd);
|
syscall(SYS_close, fd);
|
||||||
#else
|
#else
|
||||||
close(fd);
|
close(fd);
|
||||||
|
@ -49,7 +49,7 @@ static void
|
|||||||
wrtmessage(void *cbopaque, const char *s)
|
wrtmessage(void *cbopaque, const char *s)
|
||||||
{
|
{
|
||||||
|
|
||||||
#if defined(JEMALLOC_HAVE_SYSCALL) && defined(SYS_write)
|
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_write)
|
||||||
/*
|
/*
|
||||||
* Use syscall(2) rather than write(2) when possible in order to avoid
|
* Use syscall(2) rather than write(2) when possible in order to avoid
|
||||||
* the possibility of memory allocation within libc. This is necessary
|
* the possibility of memory allocation within libc. This is necessary
|
||||||
|
Loading…
Reference in New Issue
Block a user