# 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}


# 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;
                  (void) ee;
                  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


    # EPOLLEXCLUSIVE appeared in Linux 4.5, glibc 2.24

    ngx_feature="EPOLLEXCLUSIVE"
    ngx_feature_name="NGX_HAVE_EPOLLEXCLUSIVE"
    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|EPOLLEXCLUSIVE;
                      ee.data.ptr = NULL;
                      epoll_ctl(efd, EPOLL_CTL_ADD, fd, &ee)"
    . auto/feature


    # eventfd()

    ngx_feature="eventfd()"
    ngx_feature_name="NGX_HAVE_EVENTFD"
    ngx_feature_run=no
    ngx_feature_incs="#include <sys/eventfd.h>"
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test="(void) eventfd(0, 0)"
    . auto/feature

    if [ $ngx_found = yes ]; then
        have=NGX_HAVE_SYS_EVENTFD_H . auto/have
    fi


    if [ $ngx_found = no ]; then

        ngx_feature="eventfd() (SYS_eventfd)"
        ngx_feature_incs="#include <sys/syscall.h>"
        ngx_feature_test="(void) SYS_eventfd"
        . auto/feature
    fi
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


# prctl(PR_SET_KEEPCAPS)

ngx_feature="prctl(PR_SET_KEEPCAPS)"
ngx_feature_name="NGX_HAVE_PR_SET_KEEPCAPS"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/prctl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) return 1"
. auto/feature


# capabilities

ngx_feature="capabilities"
ngx_feature_name="NGX_HAVE_CAPABILITIES"
ngx_feature_run=no
ngx_feature_incs="#include <linux/capability.h>
                  #include <sys/syscall.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct __user_cap_data_struct    data;
                  struct __user_cap_header_struct  header;

                  header.version = _LINUX_CAPABILITY_VERSION_1;
                  data.effective = CAP_TO_MASK(CAP_NET_RAW);
                  data.permitted = 0;

                  (void) header;
                  (void) data;
                  (void) SYS_capset"
. 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"


# (E)BPF

ngx_feature="BPF support"
ngx_feature_name="NGX_HAVE_BPF"
ngx_feature_run=no
ngx_feature_incs="#include <linux/bpf.h>
                  #include <sys/syscall.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="
    union bpf_attr attr = { 0 };
    /* only declare BPF support if all required features found */
    attr.map_flags = 0;
    attr.map_type = BPF_MAP_TYPE_SOCKHASH;
    syscall(__NR_bpf, 0, &attr, 0);"

. auto/feature

if [ $ngx_found = yes ]; then
    BPF_FOUND=YES

    CORE_SRCS="$CORE_SRCS src/core/ngx_bpf.c"
    CORE_DEPS="$CORE_DEPS src/core/ngx_bpf.h"
fi


# SO_COOKIE socket option

ngx_feature="SO_COOKIE"
ngx_feature_name="NGX_HAVE_SO_COOKIE"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <stdint.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="socklen_t optlen = sizeof(uint64_t);
              uint64_t cookie;
              getsockopt(0, SOL_SOCKET, SO_COOKIE, &cookie, &optlen)"
. auto/feature

if [ $ngx_found = yes ]; then
    SO_COOKIE_FOUND=YES
    have=NGX_HAVE_SO_COOKIE . auto/have
fi


# ngx_quic_bpf module uses sockhash to select socket from reuseport group,
# support appeared in Linux-5.7:
#
# commit: 9fed9000c5c6cacfcaaa48aff74818072ae294cc
# bpf: Allow selecting reuseport socket from a SOCKMAP/SOCKHASH
#
if [ $NGX_QUIC_BPF$BPF_FOUND = YESYES ]; then
    echo $ngx_n "checking for kernel with reuseport/BPF support...$ngx_c"
    if [ $version -lt 329472 ]; then
        echo " not found (at least 5.7 is required)"
        NGX_QUIC_BPF=NO
    else
        echo " found"
    fi
fi