mirror of
https://github.com/nginx/nginx.git
synced 2024-12-04 13:59:00 +08:00
7b37384140
It was introduced in Linux 2.6.39, glibc 2.14 and allows to obtain file descriptors without actually opening files. Thus made it possible to traverse path with openat() syscalls without the need to have read permissions for path components. It is effectively emulates O_SEARCH which is missing on Linux. O_PATH is used in combination with O_RDONLY. The last one is ignored if O_PATH is used, but it allows nginx to not fail when it was built on modern system (i.e. glibc 2.14+) and run with a kernel older than 2.6.39. Then O_PATH is unknown to the kernel and ignored, while O_RDONLY is used. Sadly, fstat() is not working with O_PATH descriptors till Linux 3.6. As a workaround we fallback to fstatat() with the AT_EMPTY_PATH flag that was introduced at the same time as O_PATH.
186 lines
4.7 KiB
Plaintext
186 lines
4.7 KiB
Plaintext
|
|
# Copyright (C) Igor Sysoev
|
|
# Copyright (C) Nginx, Inc.
|
|
|
|
|
|
have=NGX_LINUX . auto/have_headers
|
|
|
|
CORE_INCS="$UNIX_INCS"
|
|
CORE_DEPS="$UNIX_DEPS $LINUX_DEPS"
|
|
CORE_SRCS="$UNIX_SRCS $LINUX_SRCS"
|
|
|
|
ngx_spacer='
|
|
'
|
|
|
|
cc_aux_flags="$CC_AUX_FLAGS"
|
|
CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
|
|
|
|
|
|
# Linux kernel version
|
|
|
|
version=$((`uname -r \
|
|
| sed -n -e 's/^\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/ \
|
|
\1*256*256+\2*256+\3/p' \
|
|
-e 's/^\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1*256*256+\2*256/p'`))
|
|
|
|
version=${version:-0}
|
|
|
|
|
|
# enable the rt signals on Linux between 2.2.19 and 2.6.17
|
|
|
|
if [ \( $version -ge 131603 -a $version -lt 132626 \) -o $EVENT_RTSIG = YES ]
|
|
then
|
|
echo " + rt signals found"
|
|
have=NGX_HAVE_RTSIG . auto/have
|
|
EVENT_MODULES="$EVENT_MODULES $RTSIG_MODULE"
|
|
CORE_SRCS="$CORE_SRCS $RTSIG_SRCS"
|
|
EVENT_FOUND=YES
|
|
fi
|
|
|
|
|
|
# posix_fadvise64() had been implemented in 2.5.60
|
|
|
|
if [ $version -lt 132412 ]; then
|
|
have=NGX_HAVE_POSIX_FADVISE . auto/nohave
|
|
fi
|
|
|
|
# epoll, EPOLLET version
|
|
|
|
ngx_feature="epoll"
|
|
ngx_feature_name="NGX_HAVE_EPOLL"
|
|
ngx_feature_run=yes
|
|
ngx_feature_incs="#include <sys/epoll.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="int efd = 0;
|
|
struct epoll_event ee;
|
|
ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
|
|
ee.data.ptr = NULL;
|
|
efd = epoll_create(100);
|
|
if (efd == -1) return 1;"
|
|
. auto/feature
|
|
|
|
if [ $ngx_found = yes ]; then
|
|
have=NGX_HAVE_CLEAR_EVENT . auto/have
|
|
CORE_SRCS="$CORE_SRCS $EPOLL_SRCS"
|
|
EVENT_MODULES="$EVENT_MODULES $EPOLL_MODULE"
|
|
EVENT_FOUND=YES
|
|
|
|
|
|
# EPOLLRDHUP appeared in Linux 2.6.17, glibc 2.8
|
|
|
|
ngx_feature="EPOLLRDHUP"
|
|
ngx_feature_name="NGX_HAVE_EPOLLRDHUP"
|
|
ngx_feature_run=no
|
|
ngx_feature_incs="#include <sys/epoll.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="int efd = 0, fd = 0;
|
|
struct epoll_event ee;
|
|
ee.events = EPOLLIN|EPOLLRDHUP|EPOLLET;
|
|
ee.data.ptr = NULL;
|
|
epoll_ctl(efd, EPOLL_CTL_ADD, fd, &ee)"
|
|
. auto/feature
|
|
fi
|
|
|
|
|
|
# O_PATH and AT_EMPTY_PATH were introduced in 2.6.39, glibc 2.14
|
|
|
|
ngx_feature="O_PATH"
|
|
ngx_feature_name="NGX_HAVE_O_PATH"
|
|
ngx_feature_run=no
|
|
ngx_feature_incs="#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="int fd; struct stat sb;
|
|
fd = openat(AT_FDCWD, \".\", O_PATH|O_DIRECTORY|O_NOFOLLOW);
|
|
if (fstatat(fd, \"\", &sb, AT_EMPTY_PATH) != 0) return 1"
|
|
. auto/feature
|
|
|
|
|
|
# sendfile()
|
|
|
|
CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE"
|
|
ngx_feature="sendfile()"
|
|
ngx_feature_name="NGX_HAVE_SENDFILE"
|
|
ngx_feature_run=yes
|
|
ngx_feature_incs="#include <sys/sendfile.h>
|
|
#include <errno.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="int s = 0, fd = 1;
|
|
ssize_t n; off_t off = 0;
|
|
n = sendfile(s, fd, &off, 1);
|
|
if (n == -1 && errno == ENOSYS) return 1"
|
|
. auto/feature
|
|
|
|
if [ $ngx_found = yes ]; then
|
|
CORE_SRCS="$CORE_SRCS $LINUX_SENDFILE_SRCS"
|
|
fi
|
|
|
|
|
|
# sendfile64()
|
|
|
|
CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
|
|
ngx_feature="sendfile64()"
|
|
ngx_feature_name="NGX_HAVE_SENDFILE64"
|
|
ngx_feature_run=yes
|
|
ngx_feature_incs="#include <sys/sendfile.h>
|
|
#include <errno.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="int s = 0, fd = 1;
|
|
ssize_t n; off_t off = 0;
|
|
n = sendfile(s, fd, &off, 1);
|
|
if (n == -1 && errno == ENOSYS) return 1"
|
|
. auto/feature
|
|
|
|
|
|
ngx_include="sys/prctl.h"; . auto/include
|
|
|
|
# prctl(PR_SET_DUMPABLE)
|
|
|
|
ngx_feature="prctl(PR_SET_DUMPABLE)"
|
|
ngx_feature_name="NGX_HAVE_PR_SET_DUMPABLE"
|
|
ngx_feature_run=yes
|
|
ngx_feature_incs="#include <sys/prctl.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) return 1"
|
|
. auto/feature
|
|
|
|
|
|
# sched_setaffinity()
|
|
|
|
ngx_feature="sched_setaffinity()"
|
|
ngx_feature_name="NGX_HAVE_SCHED_SETAFFINITY"
|
|
ngx_feature_run=no
|
|
ngx_feature_incs="#include <sched.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=
|
|
ngx_feature_test="cpu_set_t mask;
|
|
CPU_ZERO(&mask);
|
|
sched_setaffinity(0, sizeof(cpu_set_t), &mask)"
|
|
. auto/feature
|
|
|
|
|
|
# crypt_r()
|
|
|
|
ngx_feature="crypt_r()"
|
|
ngx_feature_name="NGX_HAVE_GNU_CRYPT_R"
|
|
ngx_feature_run=no
|
|
ngx_feature_incs="#include <crypt.h>"
|
|
ngx_feature_path=
|
|
ngx_feature_libs=-lcrypt
|
|
ngx_feature_test="struct crypt_data cd;
|
|
crypt_r(\"key\", \"salt\", &cd);"
|
|
. auto/feature
|
|
|
|
|
|
ngx_include="sys/vfs.h"; . auto/include
|
|
|
|
|
|
CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
|