Mercurial > hg > nginx
view src/os/unix/ngx_socket.c @ 7784:8cc5b0365ee5
Improved maximum errno detection.
Previously, systems without sys_nerr (or _sys_nerr) were handled with an
assumption that errors start at 0 and continuous. This is, however, not
something POSIX requires, and not true on some platforms.
Notably, on Linux, where sys_nerr is no longer available for newly linked
binaries starting with glibc 2.32, there are gaps in error list, which
used to stop us from properly detecting maximum errno. Further, on
GNU/Hurd errors start at 0x40000001.
With this change, maximum errno detection is moved to the runtime code,
now able to ignore gaps, and also detects the first error if needed.
This fixes observed "Unknown error" messages as seen on Linux with
glibc 2.32 and on GNU/Hurd.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 01 Mar 2021 20:00:43 +0300 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> /* * ioctl(FIONBIO) sets a non-blocking mode with the single syscall * while fcntl(F_SETFL, O_NONBLOCK) needs to learn the current state * using fcntl(F_GETFL). * * ioctl() and fcntl() are syscalls at least in FreeBSD 2.x, Linux 2.2 * and Solaris 7. * * ioctl() in Linux 2.4 and 2.6 uses BKL, however, fcntl(F_SETFL) uses it too. */ #if (NGX_HAVE_FIONBIO) int ngx_nonblocking(ngx_socket_t s) { int nb; nb = 1; return ioctl(s, FIONBIO, &nb); } int ngx_blocking(ngx_socket_t s) { int nb; nb = 0; return ioctl(s, FIONBIO, &nb); } #endif #if (NGX_FREEBSD) int ngx_tcp_nopush(ngx_socket_t s) { int tcp_nopush; tcp_nopush = 1; return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (const void *) &tcp_nopush, sizeof(int)); } int ngx_tcp_push(ngx_socket_t s) { int tcp_nopush; tcp_nopush = 0; return setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (const void *) &tcp_nopush, sizeof(int)); } #elif (NGX_LINUX) int ngx_tcp_nopush(ngx_socket_t s) { int cork; cork = 1; return setsockopt(s, IPPROTO_TCP, TCP_CORK, (const void *) &cork, sizeof(int)); } int ngx_tcp_push(ngx_socket_t s) { int cork; cork = 0; return setsockopt(s, IPPROTO_TCP, TCP_CORK, (const void *) &cork, sizeof(int)); } #else int ngx_tcp_nopush(ngx_socket_t s) { return 0; } int ngx_tcp_push(ngx_socket_t s) { return 0; } #endif