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Added warning about redefinition of listen socket protocol options. The "listen" directive in the http module can be used multiple times in different server blocks. Originally, it was supposed to be specified once with various socket options, and without any parameters in virtual server blocks. For example: server { listen 80 backlog=1024; server_name foo; ... } server { listen 80; server_name bar; ... } server { listen 80; server_name bazz; ... } The address part of the syntax ("address[:port]" / "port" / "unix:path") uniquely identifies the listening socket, and therefore is enough for name-based virtual servers (to let nginx know that the virtual server accepts requests on the listening socket in question). To ensure that listening options do not conflict between virtual servers, they were allowed only once. For example, the following configuration will be rejected ("duplicate listen options for 0.0.0.0:80 in ..."): server { listen 80 backlog=1024; server_name foo; ... } server { listen 80 backlog=512; server_name bar; ... } At some point it was, however, noticed, that it is sometimes convenient to repeat some options for clarity. In nginx 0.8.51 the "ssl" parameter was allowed to be specified multiple times, e.g.: server { listen 443 ssl backlog=1024; server_name foo; ... } server { listen 443 ssl; server_name bar; ... } server { listen 443 ssl; server_name bazz; ... } This approach makes configuration more readable, since SSL sockets are immediately visible in the configuration. If this is not needed, just the address can still be used. Later, additional protocol-specific options similar to "ssl" were introduced, notably "http2" and "proxy_protocol". With these options, one can write: server { listen 443 ssl backlog=1024; server_name foo; ... } server { listen 443 http2; server_name bar; ... } server { listen 443 proxy_protocol; server_name bazz; ... } The resulting socket will use ssl, http2, and proxy_protocol, but this is not really obvious from the configuration. To emphasize such misleading configurations are discouraged, nginx now warns as long as the "listen" directive is used with options different from the options previously used if this is potentially confusing. In particular, the following configurations are allowed: server { listen 8401 ssl backlog=1024; server_name foo; } server { listen 8401 ssl; server_name bar; } server { listen 8401 ssl; server_name bazz; } server { listen 8402 ssl http2 backlog=1024; server_name foo; } server { listen 8402 ssl; server_name bar; } server { listen 8402 ssl; server_name bazz; } server { listen 8403 ssl; server_name bar; } server { listen 8403 ssl; server_name bazz; } server { listen 8403 ssl http2; server_name foo; } server { listen 8404 ssl http2 backlog=1024; server_name foo; } server { listen 8404 http2; server_name bar; } server { listen 8404 http2; server_name bazz; } server { listen 8405 ssl http2 backlog=1024; server_name foo; } server { listen 8405 ssl http2; server_name bar; } server { listen 8405 ssl http2; server_name bazz; } server { listen 8406 ssl; server_name foo; } server { listen 8406; server_name bar; } server { listen 8406; server_name bazz; } And the following configurations will generate warnings: server { listen 8501 ssl http2 backlog=1024; server_name foo; } server { listen 8501 http2; server_name bar; } server { listen 8501 ssl; server_name bazz; } server { listen 8502 backlog=1024; server_name foo; } server { listen 8502 ssl; server_name bar; } server { listen 8503 ssl; server_name foo; } server { listen 8503 http2; server_name bar; } server { listen 8504 ssl; server_name foo; } server { listen 8504 http2; server_name bar; } server { listen 8504 proxy_protocol; server_name bazz; } server { listen 8505 ssl http2 proxy_protocol; server_name foo; } server { listen 8505 ssl http2; server_name bar; } server { listen 8505 ssl; server_name bazz; } server { listen 8506 ssl http2; server_name foo; } server { listen 8506 ssl; server_name bar; } server { listen 8506; server_name bazz; } server { listen 8507 ssl; server_name bar; } server { listen 8507; server_name bazz; } server { listen 8507 ssl http2; server_name foo; } server { listen 8508 ssl; server_name bar; } server { listen 8508; server_name bazz; } server { listen 8508 ssl backlog=1024; server_name foo; } server { listen 8509; server_name bazz; } server { listen 8509 ssl; server_name bar; } server { listen 8509 ssl backlog=1024; server_name foo; } The basic idea is that at most two sets of protocol options are allowed: the main one (with socket options, if any), and a shorter one, with options being a subset of the main options, repeated for clarity. As long as the shorter set of protocol options is used, all listen directives except the main one should use it.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 28 Jan 2023 01:29:45 +0300
parents e2e9e0fae747
children afebde21cb32
line wrap: on
line source


# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


NGX_USER=${NGX_USER:-nobody}

if [ -z "$NGX_GROUP" ]; then
    if [ $NGX_USER = nobody ]; then
        if grep nobody /etc/group 2>&1 >/dev/null; then
            echo "checking for nobody group ... found"
            NGX_GROUP=nobody
        else
            echo "checking for nobody group ... not found"

            if grep nogroup /etc/group 2>&1 >/dev/null; then
                echo "checking for nogroup group ... found"
                NGX_GROUP=nogroup
            else
                echo "checking for nogroup group ... not found"
                NGX_GROUP=nobody
            fi
        fi
    else
        NGX_GROUP=$NGX_USER
    fi
fi


ngx_feature="poll()"
ngx_feature_name=
ngx_feature_run=no
ngx_feature_incs="#include <poll.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int  n; struct pollfd  pl;
                  pl.fd = 0;
                  pl.events = 0;
                  pl.revents = 0;
                  n = poll(&pl, 1, 0);
                  if (n == -1) return 1"
. auto/feature

if [ $ngx_found = no ]; then
    EVENT_POLL=NONE
fi


ngx_feature="/dev/poll"
ngx_feature_name="NGX_HAVE_DEVPOLL"
ngx_feature_run=no
ngx_feature_incs="#include <sys/devpoll.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int  n, dp; struct dvpoll  dvp;
                  dp = 0;
                  dvp.dp_fds = NULL;
                  dvp.dp_nfds = 0;
                  dvp.dp_timeout = 0;
                  n = ioctl(dp, DP_POLL, &dvp);
                  if (n == -1) return 1"
. auto/feature

if [ $ngx_found = yes ]; then
    CORE_SRCS="$CORE_SRCS $DEVPOLL_SRCS"
    EVENT_MODULES="$EVENT_MODULES $DEVPOLL_MODULE"
    EVENT_FOUND=YES
fi


if test -z "$NGX_KQUEUE_CHECKED"; then
    ngx_feature="kqueue"
    ngx_feature_name="NGX_HAVE_KQUEUE"
    ngx_feature_run=no
    ngx_feature_incs="#include <sys/event.h>"
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test="(void) kqueue()"
    . auto/feature

    if [ $ngx_found = yes ]; then

        have=NGX_HAVE_CLEAR_EVENT . auto/have
        EVENT_MODULES="$EVENT_MODULES $KQUEUE_MODULE"
        CORE_SRCS="$CORE_SRCS $KQUEUE_SRCS"
        EVENT_FOUND=YES

        ngx_feature="kqueue's NOTE_LOWAT"
        ngx_feature_name="NGX_HAVE_LOWAT_EVENT"
        ngx_feature_run=no
        ngx_feature_incs="#include <sys/event.h>"
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test="struct kevent  kev;
                          kev.fflags = NOTE_LOWAT;
                          (void) kev"
        . auto/feature


        ngx_feature="kqueue's EVFILT_TIMER"
        ngx_feature_name="NGX_HAVE_TIMER_EVENT"
        ngx_feature_run=yes
        ngx_feature_incs="#include <sys/event.h>
                          #include <sys/time.h>"
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test="int      kq;
                  struct kevent    kev;
                  struct timespec  ts;

                  if ((kq = kqueue()) == -1) return 1;

                  kev.ident = 0;
                  kev.filter = EVFILT_TIMER;
                  kev.flags = EV_ADD|EV_ENABLE;
                  kev.fflags = 0;
                  kev.data = 1000;
                  kev.udata = 0;

                  ts.tv_sec = 0;
                  ts.tv_nsec = 0;

                  if (kevent(kq, &kev, 1, &kev, 1, &ts) == -1) return 1;

                  if (kev.flags & EV_ERROR) return 1;"

        . auto/feature
    fi
fi


if [ "$NGX_SYSTEM" = "NetBSD" ]; then

    # NetBSD 2.0 incompatibly defines kevent.udata as "intptr_t"

    cat << END >> $NGX_AUTO_CONFIG_H

#define NGX_KQUEUE_UDATA_T

END

else
    cat << END >> $NGX_AUTO_CONFIG_H

#define NGX_KQUEUE_UDATA_T  (void *)

END

fi


ngx_feature="crypt()"
ngx_feature_name=
ngx_feature_run=no
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="crypt(\"test\", \"salt\");"
. auto/feature


if [ $ngx_found = no ]; then

    ngx_feature="crypt() in libcrypt"
    ngx_feature_name=
    ngx_feature_run=no
    ngx_feature_incs=
    ngx_feature_path=
    ngx_feature_libs=-lcrypt
    . auto/feature

    if [ $ngx_found = yes ]; then
        CRYPT_LIB="-lcrypt"
    fi
fi


ngx_feature="F_READAHEAD"
ngx_feature_name="NGX_HAVE_F_READAHEAD"
ngx_feature_run=no
ngx_feature_incs="#include <fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="fcntl(0, F_READAHEAD, 1);"
. auto/feature


ngx_feature="posix_fadvise()"
ngx_feature_name="NGX_HAVE_POSIX_FADVISE"
ngx_feature_run=no
ngx_feature_incs="#include <fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="posix_fadvise(0, 0, 0, POSIX_FADV_SEQUENTIAL);"
. auto/feature


ngx_feature="O_DIRECT"
ngx_feature_name="NGX_HAVE_O_DIRECT"
ngx_feature_run=no
ngx_feature_incs="#include <fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="fcntl(0, F_SETFL, O_DIRECT);"
. auto/feature


if [ $ngx_found = yes -a "$NGX_SYSTEM" = "Linux" ]; then
    have=NGX_HAVE_ALIGNED_DIRECTIO . auto/have
fi

ngx_feature="F_NOCACHE"
ngx_feature_name="NGX_HAVE_F_NOCACHE"
ngx_feature_run=no
ngx_feature_incs="#include <fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="fcntl(0, F_NOCACHE, 1);"
. auto/feature


ngx_feature="directio()"
ngx_feature_name="NGX_HAVE_DIRECTIO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/types.h>
                  #include <sys/fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="directio(0, DIRECTIO_ON);"
. auto/feature


ngx_feature="statfs()"
ngx_feature_name="NGX_HAVE_STATFS"
ngx_feature_run=no
ngx_feature_incs="$NGX_INCLUDE_SYS_PARAM_H
                  $NGX_INCLUDE_SYS_MOUNT_H
                  $NGX_INCLUDE_SYS_VFS_H"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct statfs  fs;
                  statfs(\".\", &fs);"
. auto/feature


ngx_feature="statvfs()"
ngx_feature_name="NGX_HAVE_STATVFS"
ngx_feature_run=no
ngx_feature_incs="#include <sys/types.h>
                  #include <sys/statvfs.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct statvfs  fs;
                  statvfs(\".\", &fs);"
. auto/feature


ngx_feature="dlopen()"
ngx_feature_name="NGX_HAVE_DLOPEN"
ngx_feature_run=no
ngx_feature_incs="#include <dlfcn.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="dlopen(NULL, RTLD_NOW | RTLD_GLOBAL); dlsym(NULL, \"\")"
. auto/feature


if [ $ngx_found = no ]; then

    ngx_feature="dlopen() in libdl"
    ngx_feature_libs="-ldl"
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS -ldl"
        NGX_LIBDL="-ldl"
    fi
fi


ngx_feature="sched_yield()"
ngx_feature_name="NGX_HAVE_SCHED_YIELD"
ngx_feature_run=no
ngx_feature_incs="#include <sched.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="sched_yield()"
. auto/feature


if [ $ngx_found = no ]; then

    ngx_feature="sched_yield() in librt"
    ngx_feature_libs="-lrt"
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS -lrt"
    fi
fi


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


ngx_feature="SO_SETFIB"
ngx_feature_name="NGX_HAVE_SETFIB"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, SOL_SOCKET, SO_SETFIB, NULL, 0)"
. auto/feature


ngx_feature="SO_REUSEPORT"
ngx_feature_name="NGX_HAVE_REUSEPORT"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, SOL_SOCKET, SO_REUSEPORT, NULL, 0)"
. auto/feature


ngx_feature="SO_ACCEPTFILTER"
ngx_feature_name="NGX_HAVE_DEFERRED_ACCEPT"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0)"
. auto/feature


# OpenBSD bind to any address for transparent proxying

ngx_feature="SO_BINDANY"
ngx_feature_name="NGX_HAVE_TRANSPARENT_PROXY"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, SOL_SOCKET, SO_BINDANY, NULL, 0)"
. auto/feature


# Linux transparent proxying

ngx_feature="IP_TRANSPARENT"
ngx_feature_name="NGX_HAVE_TRANSPARENT_PROXY"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_TRANSPARENT, NULL, 0)"
. auto/feature


# FreeBSD bind to any address for transparent proxying

ngx_feature="IP_BINDANY"
ngx_feature_name="NGX_HAVE_TRANSPARENT_PROXY"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_BINDANY, NULL, 0)"
. auto/feature


# Linux IP_BIND_ADDRESS_NO_PORT

ngx_feature="IP_BIND_ADDRESS_NO_PORT"
ngx_feature_name="NGX_HAVE_IP_BIND_ADDRESS_NO_PORT"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT, NULL, 0)"
. auto/feature


# BSD way to get IPv4 datagram destination address

ngx_feature="IP_RECVDSTADDR"
ngx_feature_name="NGX_HAVE_IP_RECVDSTADDR"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_RECVDSTADDR, NULL, 0)"
. auto/feature


# BSD way to set IPv4 datagram source address

ngx_feature="IP_SENDSRCADDR"
ngx_feature_name="NGX_HAVE_IP_SENDSRCADDR"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_SENDSRCADDR, NULL, 0)"
. auto/feature


# Linux way to get IPv4 datagram destination address

ngx_feature="IP_PKTINFO"
ngx_feature_name="NGX_HAVE_IP_PKTINFO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct in_pktinfo  pkt;
                  pkt.ipi_spec_dst.s_addr = INADDR_ANY;
                  (void) pkt;
                  setsockopt(0, IPPROTO_IP, IP_PKTINFO, NULL, 0)"
. auto/feature


# RFC 3542 way to get IPv6 datagram destination address

ngx_feature="IPV6_RECVPKTINFO"
ngx_feature_name="NGX_HAVE_IPV6_RECVPKTINFO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_IPV6, IPV6_RECVPKTINFO, NULL, 0)"
. auto/feature


ngx_feature="TCP_DEFER_ACCEPT"
ngx_feature_name="NGX_HAVE_DEFERRED_ACCEPT"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>
                  #include <netinet/tcp.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_TCP, TCP_DEFER_ACCEPT, NULL, 0)"
. auto/feature


ngx_feature="TCP_KEEPIDLE"
ngx_feature_name="NGX_HAVE_KEEPALIVE_TUNABLE"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>
                  #include <netinet/tcp.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_TCP, TCP_KEEPIDLE, NULL, 0);
                  setsockopt(0, IPPROTO_TCP, TCP_KEEPINTVL, NULL, 0);
                  setsockopt(0, IPPROTO_TCP, TCP_KEEPCNT, NULL, 0)"
. auto/feature


ngx_feature="TCP_FASTOPEN"
ngx_feature_name="NGX_HAVE_TCP_FASTOPEN"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>
                  #include <netinet/tcp.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="setsockopt(0, IPPROTO_TCP, TCP_FASTOPEN, NULL, 0)"
. auto/feature


ngx_feature="TCP_INFO"
ngx_feature_name="NGX_HAVE_TCP_INFO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>
                  #include <netinet/tcp.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="socklen_t optlen = sizeof(struct tcp_info);
                  struct tcp_info ti;
                  ti.tcpi_rtt = 0;
                  ti.tcpi_rttvar = 0;
                  ti.tcpi_snd_cwnd = 0;
                  ti.tcpi_rcv_space = 0;
                  getsockopt(0, IPPROTO_TCP, TCP_INFO, &ti, &optlen)"
. auto/feature


ngx_feature="accept4()"
ngx_feature_name="NGX_HAVE_ACCEPT4"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="accept4(0, NULL, NULL, SOCK_NONBLOCK)"
. auto/feature

if [ $NGX_FILE_AIO = YES ]; then

    ngx_feature="kqueue AIO support"
    ngx_feature_name="NGX_HAVE_FILE_AIO"
    ngx_feature_run=no
    ngx_feature_incs="#include <aio.h>"
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test="struct aiocb  iocb;
                      iocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
                      (void) aio_read(&iocb)"
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_SRCS="$CORE_SRCS $FILE_AIO_SRCS"
    fi

    if [ $ngx_found = no ]; then

        ngx_feature="Linux AIO support"
        ngx_feature_name="NGX_HAVE_FILE_AIO"
        ngx_feature_run=no
        ngx_feature_incs="#include <linux/aio_abi.h>
                          #include <sys/eventfd.h>"
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test="struct iocb  iocb;
                          iocb.aio_lio_opcode = IOCB_CMD_PREAD;
                          iocb.aio_flags = IOCB_FLAG_RESFD;
                          iocb.aio_resfd = -1;
                          (void) iocb;
                          (void) eventfd(0, 0)"
        . auto/feature

        if [ $ngx_found = yes ]; then
            have=NGX_HAVE_EVENTFD . auto/have
            have=NGX_HAVE_SYS_EVENTFD_H . auto/have
            CORE_SRCS="$CORE_SRCS $LINUX_AIO_SRCS"
        fi
    fi

    if [ $ngx_found = no ]; then

        ngx_feature="Linux AIO support (SYS_eventfd)"
        ngx_feature_incs="#include <linux/aio_abi.h>
                          #include <sys/syscall.h>"
        ngx_feature_test="struct iocb  iocb;
                          iocb.aio_lio_opcode = IOCB_CMD_PREAD;
                          iocb.aio_flags = IOCB_FLAG_RESFD;
                          iocb.aio_resfd = -1;
                          (void) iocb;
                          (void) SYS_eventfd"
        . auto/feature

        if [ $ngx_found = yes ]; then
            have=NGX_HAVE_EVENTFD . auto/have
            CORE_SRCS="$CORE_SRCS $LINUX_AIO_SRCS"
        fi
    fi

    if [ $ngx_found = no ]; then
        cat << END

$0: no supported file AIO was found
Currently file AIO is supported on FreeBSD 4.3+ and Linux 2.6.22+ only

END
        exit 1
    fi
fi


have=NGX_HAVE_UNIX_DOMAIN . auto/have

ngx_feature_libs=


# C types

ngx_type="int"; . auto/types/sizeof

ngx_type="long"; . auto/types/sizeof

ngx_type="long long"; . auto/types/sizeof

ngx_type="void *"; . auto/types/sizeof; ngx_ptr_size=$ngx_size
ngx_param=NGX_PTR_SIZE; ngx_value=$ngx_size; . auto/types/value


# POSIX types

NGX_INCLUDE_AUTO_CONFIG_H="#include \"ngx_auto_config.h\""

ngx_type="uint32_t"; ngx_types="u_int32_t"; . auto/types/typedef
ngx_type="uint64_t"; ngx_types="u_int64_t"; . auto/types/typedef

ngx_type="sig_atomic_t"; ngx_types="int"; . auto/types/typedef
. auto/types/sizeof
ngx_param=NGX_SIG_ATOMIC_T_SIZE; ngx_value=$ngx_size; . auto/types/value

ngx_type="socklen_t"; ngx_types="int"; . auto/types/typedef

ngx_type="in_addr_t"; ngx_types="uint32_t u_int32_t"; . auto/types/typedef

ngx_type="in_port_t"; ngx_types="u_short"; . auto/types/typedef

ngx_type="rlim_t"; ngx_types="int"; . auto/types/typedef

. auto/types/uintptr_t

. auto/endianness

ngx_type="size_t"; . auto/types/sizeof
ngx_param=NGX_MAX_SIZE_T_VALUE; ngx_value=$ngx_max_value; . auto/types/value
ngx_param=NGX_SIZE_T_LEN; ngx_value=$ngx_max_len; . auto/types/value

ngx_type="off_t"; . auto/types/sizeof
ngx_param=NGX_MAX_OFF_T_VALUE; ngx_value=$ngx_max_value; . auto/types/value
ngx_param=NGX_OFF_T_LEN; ngx_value=$ngx_max_len; . auto/types/value

ngx_type="time_t"; . auto/types/sizeof
ngx_param=NGX_TIME_T_SIZE; ngx_value=$ngx_size; . auto/types/value
ngx_param=NGX_TIME_T_LEN; ngx_value=$ngx_max_len; . auto/types/value
ngx_param=NGX_MAX_TIME_T_VALUE; ngx_value=$ngx_max_value; . auto/types/value


# syscalls, libc calls and some features


ngx_feature="AF_INET6"
ngx_feature_name="NGX_HAVE_INET6"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <netinet/in.h>
                  #include <arpa/inet.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct sockaddr_in6  sin6;
                  sin6.sin6_family = AF_INET6;
                  (void) sin6"
. auto/feature


ngx_feature="setproctitle()"
ngx_feature_name="NGX_HAVE_SETPROCTITLE"
ngx_feature_run=no
ngx_feature_incs="#include <stdlib.h>"
ngx_feature_path=
ngx_feature_libs=$NGX_SETPROCTITLE_LIB
ngx_feature_test="setproctitle(\"test\");"
. auto/feature


ngx_feature="pread()"
ngx_feature_name="NGX_HAVE_PREAD"
ngx_feature_run=no
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="char buf[1]; ssize_t n; n = pread(0, buf, 1, 0);
                  if (n == -1) return 1"
. auto/feature


ngx_feature="pwrite()"
ngx_feature_name="NGX_HAVE_PWRITE"
ngx_feature_run=no
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="char buf[1]; ssize_t n; n = pwrite(1, buf, 1, 0);
                  if (n == -1) return 1"
. auto/feature


# pwritev() was introduced in FreeBSD 6 and Linux 2.6.30, glibc 2.10

ngx_feature="pwritev()"
ngx_feature_name="NGX_HAVE_PWRITEV"
ngx_feature_run=no
ngx_feature_incs='#include <sys/uio.h>'
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="char buf[1]; struct iovec vec[1]; ssize_t n;
                  vec[0].iov_base = buf;
                  vec[0].iov_len = 1;
                  n = pwritev(1, vec, 1, 0);
                  if (n == -1) return 1"
. auto/feature


# strerrordesc_np(), introduced in glibc 2.32

ngx_feature="strerrordesc_np()"
ngx_feature_name="NGX_HAVE_STRERRORDESC_NP"
ngx_feature_run=no
ngx_feature_incs='#include <string.h>'
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="char *p; p = strerrordesc_np(0);
                  if (p == NULL) return 1"
. auto/feature


if [ $ngx_found = no ]; then

    ngx_feature="sys_nerr"
    ngx_feature_name="NGX_SYS_NERR"
    ngx_feature_run=value
    ngx_feature_incs='#include <errno.h>
                      #include <stdio.h>'
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test='printf("%d", sys_nerr);'
    . auto/feature
fi


if [ $ngx_found = no ]; then

    # Cygiwn defines _sys_nerr
    ngx_feature="_sys_nerr"
    ngx_feature_name="NGX_SYS_NERR"
    ngx_feature_run=value
    ngx_feature_incs='#include <errno.h>
                      #include <stdio.h>'
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test='printf("%d", _sys_nerr);'
    . auto/feature
fi


ngx_feature="localtime_r()"
ngx_feature_name="NGX_HAVE_LOCALTIME_R"
ngx_feature_run=no
ngx_feature_incs="#include <time.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct tm t; time_t c=0; localtime_r(&c, &t)"
. auto/feature


ngx_feature="clock_gettime(CLOCK_MONOTONIC)"
ngx_feature_name="NGX_HAVE_CLOCK_MONOTONIC"
ngx_feature_run=no
ngx_feature_incs="#include <time.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts)"
. auto/feature


if [ $ngx_found = no ]; then

    # Linux before glibc 2.17, notably CentOS 6

    ngx_feature="clock_gettime(CLOCK_MONOTONIC) in librt"
    ngx_feature_libs="-lrt"
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS -lrt"
    fi
fi


ngx_feature="posix_memalign()"
ngx_feature_name="NGX_HAVE_POSIX_MEMALIGN"
ngx_feature_run=no
ngx_feature_incs="#include <stdlib.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="void *p; int n; n = posix_memalign(&p, 4096, 4096);
                  if (n != 0) return 1"
. auto/feature


ngx_feature="memalign()"
ngx_feature_name="NGX_HAVE_MEMALIGN"
ngx_feature_run=no
ngx_feature_incs="#include <stdlib.h>
                  #include <malloc.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="void *p; p = memalign(4096, 4096);
                  if (p == NULL) return 1"
. auto/feature


ngx_feature="mmap(MAP_ANON|MAP_SHARED)"
ngx_feature_name="NGX_HAVE_MAP_ANON"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/mman.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="void *p;
                  p = mmap(NULL, 4096, PROT_READ|PROT_WRITE,
                           MAP_ANON|MAP_SHARED, -1, 0);
                  if (p == MAP_FAILED) return 1;"
. auto/feature


ngx_feature='mmap("/dev/zero", MAP_SHARED)'
ngx_feature_name="NGX_HAVE_MAP_DEVZERO"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/mman.h>
                  #include <sys/stat.h>
                  #include <fcntl.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test='void *p; int  fd;
                  fd = open("/dev/zero", O_RDWR);
                  p = mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
                  if (p == MAP_FAILED) return 1;'
. auto/feature


ngx_feature="System V shared memory"
ngx_feature_name="NGX_HAVE_SYSVSHM"
ngx_feature_run=yes
ngx_feature_incs="#include <sys/ipc.h>
                  #include <sys/shm.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int  id;
                  id = shmget(IPC_PRIVATE, 4096, (SHM_R|SHM_W|IPC_CREAT));
                  if (id == -1) return 1;
                  shmctl(id, IPC_RMID, NULL);"
. auto/feature


ngx_feature="POSIX semaphores"
ngx_feature_name="NGX_HAVE_POSIX_SEM"
ngx_feature_run=yes
ngx_feature_incs="#include <semaphore.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="sem_t  sem;
                  if (sem_init(&sem, 1, 0) == -1) return 1;
                  sem_destroy(&sem);"
. auto/feature


if [ $ngx_found = no ]; then

    # Linux has POSIX semaphores in libpthread
    ngx_feature="POSIX semaphores in libpthread"
    ngx_feature_libs=-lpthread
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS -lpthread"
        NGX_LIBPTHREAD="-lpthread"
    fi
fi


if [ $ngx_found = no ]; then

    # Solaris has POSIX semaphores in librt
    ngx_feature="POSIX semaphores in librt"
    ngx_feature_libs=-lrt
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS -lrt"
    fi
fi


ngx_feature="struct msghdr.msg_control"
ngx_feature_name="NGX_HAVE_MSGHDR_MSG_CONTROL"
ngx_feature_run=no
ngx_feature_incs="#include <sys/socket.h>
                  #include <stdio.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct msghdr  msg;
                  printf(\"%d\", (int) sizeof(msg.msg_control))"
. auto/feature


ngx_feature="ioctl(FIONBIO)"
ngx_feature_name="NGX_HAVE_FIONBIO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/ioctl.h>
                  #include <stdio.h>
                  $NGX_INCLUDE_SYS_FILIO_H"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int i = FIONBIO; printf(\"%d\", i)"
. auto/feature


ngx_feature="ioctl(FIONREAD)"
ngx_feature_name="NGX_HAVE_FIONREAD"
ngx_feature_run=no
ngx_feature_incs="#include <sys/ioctl.h>
                  #include <stdio.h>
                  $NGX_INCLUDE_SYS_FILIO_H"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="int i = FIONREAD; printf(\"%d\", i)"
. auto/feature


ngx_feature="struct tm.tm_gmtoff"
ngx_feature_name="NGX_HAVE_GMTOFF"
ngx_feature_run=no
ngx_feature_incs="#include <time.h>
                  #include <stdio.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct tm  tm; tm.tm_gmtoff = 0;
                  printf(\"%d\", (int) tm.tm_gmtoff)"
. auto/feature


ngx_feature="struct dirent.d_namlen"
ngx_feature_name="NGX_HAVE_D_NAMLEN"
ngx_feature_run=no
ngx_feature_incs="#include <dirent.h>
                  #include <stdio.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct dirent  dir; dir.d_namlen = 0;
                  printf(\"%d\", (int) dir.d_namlen)"
. auto/feature


ngx_feature="struct dirent.d_type"
ngx_feature_name="NGX_HAVE_D_TYPE"
ngx_feature_run=no
ngx_feature_incs="#include <dirent.h>
                  #include <stdio.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="struct dirent  dir; dir.d_type = DT_REG;
                  printf(\"%d\", (int) dir.d_type)"
. auto/feature


ngx_feature="sysconf(_SC_NPROCESSORS_ONLN)"
ngx_feature_name="NGX_HAVE_SC_NPROCESSORS_ONLN"
ngx_feature_run=no
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="sysconf(_SC_NPROCESSORS_ONLN)"
. auto/feature


ngx_feature="sysconf(_SC_LEVEL1_DCACHE_LINESIZE)"
ngx_feature_name="NGX_HAVE_LEVEL1_DCACHE_LINESIZE"
ngx_feature_run=no
ngx_feature_incs=
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test="sysconf(_SC_LEVEL1_DCACHE_LINESIZE)"
. auto/feature


ngx_feature="openat(), fstatat()"
ngx_feature_name="NGX_HAVE_OPENAT"
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="struct stat sb;
                  openat(AT_FDCWD, \".\", O_RDONLY|O_NOFOLLOW);
                  fstatat(AT_FDCWD, \".\", &sb, AT_SYMLINK_NOFOLLOW);"
. auto/feature


ngx_feature="getaddrinfo()"
ngx_feature_name="NGX_HAVE_GETADDRINFO"
ngx_feature_run=no
ngx_feature_incs="#include <sys/types.h>
                  #include <sys/socket.h>
                  #include <netdb.h>"
ngx_feature_path=
ngx_feature_libs=
ngx_feature_test='struct addrinfo *res;
                  if (getaddrinfo("localhost", NULL, NULL, &res) != 0) return 1;
                  freeaddrinfo(res)'
. auto/feature