Mercurial > hg > nginx

annotate src/os/unix/ngx_linux_config.h @ 5356:acd51b0f6fd4

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Disable symlinks: use O_PATH to open path components. 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.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 02 Sep 2013 08:07:59 +0400
parents 7f4ec5bfb715
children 72e31d88defa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_LINUX_CONFIG_H_INCLUDED_
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9 #define _NGX_LINUX_CONFIG_H_INCLUDED_
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12 #ifndef _GNU_SOURCE
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13 #define _GNU_SOURCE /* pread(), pwrite(), gethostname() */
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14 #endif
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16 #define _FILE_OFFSET_BITS 64
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18 #include <sys/types.h>
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19 #include <sys/time.h>
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20 #include <unistd.h>
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21 #include <stdarg.h>
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22 #include <stddef.h> /* offsetof() */
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23 #include <stdio.h>
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24 #include <stdlib.h>
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25 #include <errno.h>
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26 #include <string.h>
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27 #include <signal.h>
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28 #include <pwd.h>
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29 #include <grp.h>
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30 #include <dirent.h>
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31 #include <glob.h>
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32 #include <sys/vfs.h> /* statfs() */
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34 #include <sys/uio.h>
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35 #include <sys/stat.h>
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36 #include <fcntl.h>
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38 #include <sys/wait.h>
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39 #include <sys/mman.h>
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40 #include <sys/resource.h>
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41 #include <sched.h>
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43 #include <sys/socket.h>
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44 #include <netinet/in.h>
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45 #include <netinet/tcp.h> /* TCP_NODELAY, TCP_CORK */
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46 #include <arpa/inet.h>
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47 #include <netdb.h>
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48 #include <sys/un.h>
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50 #include <time.h> /* tzset() */
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51 #include <malloc.h> /* memalign() */
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52 #include <limits.h> /* IOV_MAX */
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53 #include <sys/ioctl.h>
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54 #include <crypt.h>
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55 #include <sys/utsname.h> /* uname() */
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58 #include <ngx_auto_config.h>
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61 #if (NGX_HAVE_POSIX_SEM)
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62 #include <semaphore.h>
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63 #endif
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64
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66 #if (NGX_HAVE_SYS_PRCTL_H)
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67 #include <sys/prctl.h>
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68 #endif
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71 #if (NGX_HAVE_SENDFILE64)
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72 #include <sys/sendfile.h>
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73 #else
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74 extern ssize_t sendfile(int s, int fd, int32_t *offset, size_t size);
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75 #define NGX_SENDFILE_LIMIT 0x80000000
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76 #endif
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79 #if (NGX_HAVE_POLL)
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80 #include <poll.h>
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81 #endif
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84 #if (NGX_HAVE_RTSIG)
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85 #include <poll.h>
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86 #include <sys/sysctl.h>
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87 #endif
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90 #if (NGX_HAVE_EPOLL)
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91 #include <sys/epoll.h>
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92 #endif
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95 #if (NGX_HAVE_FILE_AIO)
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96 #include <sys/syscall.h>
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97 #include <linux/aio_abi.h>
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98 typedef struct iocb ngx_aiocb_t;
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99 #endif
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100
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101
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102 #define NGX_LISTEN_BACKLOG 511
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105 #ifndef NGX_HAVE_SO_SNDLOWAT
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106 /* setsockopt(SO_SNDLOWAT) returns ENOPROTOOPT */
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107 #define NGX_HAVE_SO_SNDLOWAT 0
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108 #endif
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111 #ifndef NGX_HAVE_INHERITED_NONBLOCK
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112 #define NGX_HAVE_INHERITED_NONBLOCK 0
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113 #endif
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116 #define NGX_HAVE_OS_SPECIFIC_INIT 1
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117 #define ngx_debug_init()
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120 extern char **environ;
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738fe44c70d5 nginx-0.0.1-2003-05-21-17:28:21 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
123 #endif /* _NGX_LINUX_CONFIG_H_INCLUDED_ */