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nginx 启动时提示 invalid event type "epoll"

时间：2010-06-05

来源：互联网

内核是由redhat9 的 2.4.20 升级到现在的 2.6.18

nginx configure 的结果如下：
[root@localhost nginx-0.8.36]# ./configure --user=www --group=www --prefix=/data/app/nginx --with-openssl=/usr/include --with-http_stub_status_module
checking for OS
+ Linux 2.6.18 i686
checking for C compiler ... found
+ using GNU C compiler
+ gcc version: 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
checking for gcc -pipe switch ... found
checking for gcc builtin atomic operations ... not found
checking for gcc variadic macros ... found
checking for C99 variadic macros ... found
checking for unistd.h ... found
checking for inttypes.h ... found
checking for limits.h ... found
checking for sys/filio.h ... not found
checking for sys/param.h ... found
checking for sys/mount.h ... found
checking for sys/statvfs.h ... found
checking for crypt.h ... found
checking for Linux specific features
checking for epoll ... not found
checking for sendfile() ... found
checking for sendfile64() ... found
checking for sys/prctl.h ... found
checking for prctl(PR_SET_DUMPABLE) ... found
checking for sched_setaffinity() ... not found
checking for crypt_r() ... found
checking for sys/vfs.h ... found
checking for poll() ... found
checking for /dev/poll ... not found
checking for kqueue ... not found
checking for crypt() ... not found
checking for crypt() in libcrypt ... found
checking for F_READAHEAD ... not found
checking for posix_fadvise() ... found
checking for O_DIRECT ... found
checking for F_NOCACHE ... not found
checking for directio() ... not found
checking for statfs() ... found
checking for statvfs() ... found
checking for dlopen() ... not found
checking for dlopen() in libdl ... found
checking for sched_yield() ... found
checking for PCRE library ... found
checking for system md library ... not found
checking for system md5 library ... not found
checking for OpenSSL md5 crypto library ... found
checking for zlib library ... found
creating objs/Makefile
checking for int size ... 4 bytes
checking for long size ... 4 bytes
checking for long long size ... 8 bytes
checking for void * size ... 4 bytes
checking for uint64_t ... found
checking for sig_atomic_t ... found
checking for sig_atomic_t size ... 4 bytes
checking for socklen_t ... found
checking for in_addr_t ... found
checking for in_port_t ... found
checking for rlim_t ... found
checking for uintptr_t ... uintptr_t found
checking for system endianess ... little endianess
checking for size_t size ... 4 bytes
checking for off_t size ... 8 bytes
checking for time_t size ... 4 bytes
checking for setproctitle() ... not found
checking for pread() ... found
checking for pwrite() ... found
checking for strerror_r() ... found but is not working
checking for gnu style strerror_r() ... found
checking for sys_errlist[] ... found
checking for localtime_r() ... found
checking for posix_memalign() ... found
checking for memalign() ... found
checking for mmap(MAP_ANON|MAP_SHARED) ... found
checking for mmap("/dev/zero", MAP_SHARED) ... found
checking for System V shared memory ... found
checking for struct msghdr.msg_control ... found
checking for ioctl(FIONBIO) ... found
checking for struct tm.tm_gmtoff ... found
checking for struct dirent.d_namlen ... not found
checking for struct dirent.d_type ... found

Configuration summary
  + using system PCRE library
  + using OpenSSL library: /usr/include
  + md5: using system crypto library
  + sha1 library is not used
  + using system zlib library

  nginx path prefix: "/data/app/nginx"
  nginx binary file: "/data/app/nginx/sbin/nginx"
  nginx configuration prefix: "/data/app/nginx/conf"
  nginx configuration file: "/data/app/nginx/conf/nginx.conf"
  nginx pid file: "/data/app/nginx/logs/nginx.pid"
  nginx error log file: "/data/app/nginx/logs/error.log"
  nginx http access log file: "/data/app/nginx/logs/access.log"
  nginx http client request body temporary files: "client_body_temp"
  nginx http proxy temporary files: "proxy_temp"
  nginx http fastcgi temporary files: "fastcgi_temp"

中间发现有个 checking for epoll ... not found
大家知道怎么解决吗？

作者: leec1981 发布时间: 2010-06-05

没可能的啊
2.6的内核应该都有epoll机制的啊
要不你试试装装其他的发行版本的2.6系统

EPOLL does not exist in Red Hat Enterprise Linux version 3. This is a feature of the 2.6 kernel. Red Hat Enterprise Linux version 3 is based on the 2.4 Linux kernel. The EPOLL functionality was unable to be back-ported to the 2.4 kernel due to issues with maintenance of the Application Binary Interface (ABI).
EPOLL should be available in versions of Red Hat Enterprise Linux that use the 2.6 kernel or later, such as Red Hat Enterprise Linux 4. The Red Hat Enterprise Linux 4 ISO files are available to download to subscribers from Red Hat Network (RHN).

作者: okdgltc 发布时间: 2010-06-05

RedHat 9.0的glibc库版本太老，不支持epoll这个api。而且出于兼容性的考虑，不建议你升级glibc库到新版本，以免其他程序运行出错。如果你必须用RedHat这么老的版本的话，你只能用以下形式直接调用glibc底层_syscall1 _syscall3 _syscall4来使用epoll

#define __sys_epoll_create(maxfds) _syscall1(int, sys_epoll_create, int, maxfds)
#define __sys_epoll_ctl(epfd, op, fd, events) _syscall4(int, sys_epoll_ctl, \
int, epfd, int, op, int, fd, unsigned int, events)
#define __sys_epoll_wait(epfd, events, timeout) _syscall3(int, sys_epoll_wait, \
int, epfd, struct pollfd **, events, int, timeout)

复制代码

sys_epoll_create sys_epoll_ctl sys_epoll_wait的内核常量值在对应内核的源码里查。比较老的内核应该是