src/posix.h

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_posix_h__
   8 #define INCLUDE_posix_h__
   9
  10 #include "common.h"
  11
  12 #include <stdlib.h>
  13 #include <fcntl.h>
  14 #include <time.h>
  15
  16 /* stat: file mode type testing macros */
  17 #ifndef S_IFGITLINK
  18 #define S_IFGITLINK 0160000
  19 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
  20 #endif
  21
  22 #ifndef S_IFLNK
  23 #define S_IFLNK 0120000
  24 #undef _S_IFLNK
  25 #define _S_IFLNK S_IFLNK
  26 #endif
  27
  28 #ifndef S_IWUSR
  29 #define S_IWUSR 00200
  30 #endif
  31
  32 #ifndef S_IXUSR
  33 #define S_IXUSR 00100
  34 #endif
  35
  36 #ifndef S_ISLNK
  37 #define S_ISLNK(m) (((m) & _S_IFMT) == _S_IFLNK)
  38 #endif
  39
  40 #ifndef S_ISDIR
  41 #define S_ISDIR(m) (((m) & _S_IFMT) == _S_IFDIR)
  42 #endif
  43
  44 #ifndef S_ISREG
  45 #define S_ISREG(m) (((m) & _S_IFMT) == _S_IFREG)
  46 #endif
  47
  48 #ifndef S_ISFIFO
  49 #define S_ISFIFO(m) (((m) & _S_IFMT) == _S_IFIFO)
  50 #endif
  51
  52 /* if S_ISGID is not defined, then don't try to set it */
  53 #ifndef S_ISGID
  54 #define S_ISGID 0
  55 #endif
  56
  57 #ifndef O_BINARY
  58 #define O_BINARY 0
  59 #endif
  60 #ifndef O_CLOEXEC
  61 #define O_CLOEXEC 0
  62 #endif
  63 #ifndef SOCK_CLOEXEC
  64 #define SOCK_CLOEXEC 0
  65 #endif
  66
  67 /* access() mode parameter #defines     */
  68 #ifndef F_OK
  69 #define F_OK 0 /* existence check */
  70 #endif
  71 #ifndef W_OK
  72 #define W_OK 2 /* write mode check */
  73 #endif
  74 #ifndef R_OK
  75 #define R_OK 4 /* read mode check */
  76 #endif
  77
  78 /* Determine whether an errno value indicates that a read or write failed
  79  * because the descriptor is blocked.
  80  */
  81 #if defined(EWOULDBLOCK)
  82 #define GIT_ISBLOCKED(e) ((e) == EAGAIN || (e) == EWOULDBLOCK)
  83 #else
  84 #define GIT_ISBLOCKED(e) ((e) == EAGAIN)
  85 #endif
  86
  87 /* define some standard errnos that the runtime may be missing.  for example,
  88  * mingw lacks EAFNOSUPPORT. */
  89 #ifndef EAFNOSUPPORT
  90 #define EAFNOSUPPORT (INT_MAX-1)
  91 #endif
  92
  93 /* Compiler independent macro to handle signal interrpted system calls */
  94 #define HANDLE_EINTR(result, x) do {                                    \
  95                 result = (x);                                           \
  96         } while (result == -1 && errno == EINTR);
  97
  98
  99 /* Provide a 64-bit size for offsets. */
 100
 101 #if defined(_MSC_VER)
 102 typedef __int64 off64_t;
 103 #elif defined(__HAIKU__)
 104 typedef __haiku_std_int64 off64_t;
 105 #elif defined(__APPLE__)
 106 typedef __int64_t off64_t;
 107 #else
 108 typedef int64_t off64_t;
 109 #endif
 110
 111 typedef int git_file;
 112
 113 /**
 114  * Standard POSIX Methods
 115  *
 116  * All the methods starting with the `p_` prefix are
 117  * direct ports of the standard POSIX methods.
 118  *
 119  * Some of the methods are slightly wrapped to provide
 120  * saner defaults. Some of these methods are emulated
 121  * in Windows platforms.
 122  *
 123  * Use your manpages to check the docs on these.
 124  */
 125
 126 extern ssize_t p_read(git_file fd, void *buf, size_t cnt);
 127 extern int p_write(git_file fd, const void *buf, size_t cnt);
 128
 129 extern ssize_t p_pread(int fd, void *data, size_t size, off64_t offset);
 130 extern ssize_t p_pwrite(int fd, const void *data, size_t size, off64_t offset);
 131
 132 #define p_close(fd) close(fd)
 133 #define p_umask(m) umask(m)
 134
 135 extern int p_open(const char *path, int flags, ...);
 136 extern int p_creat(const char *path, mode_t mode);
 137 extern int p_getcwd(char *buffer_out, size_t size);
 138 extern int p_rename(const char *from, const char *to);
 139
 140 extern int git__page_size(size_t *page_size);
 141 extern int git__mmap_alignment(size_t *page_size);
 142
 143 /* The number of times `p_fsync` has been called.  Note that this is for
 144  * test code only; it it not necessarily thread-safe and should not be
 145  * relied upon in production.
 146  */
 147 extern size_t p_fsync__cnt;
 148
 149 /**
 150  * Platform-dependent methods
 151  */
 152 #ifdef GIT_WIN32
 153 #       include "win32/posix.h"
 154 #else
 155 #       include "unix/posix.h"
 156 #endif
 157
 158 #include "strnlen.h"
 159
 160 #ifdef NO_READDIR_R
 161 GIT_INLINE(int) p_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
 162 {
 163         GIT_UNUSED(entry);
 164         *result = readdir(dirp);
 165         return 0;
 166 }
 167 #else /* NO_READDIR_R */
 168 #       define p_readdir_r(d,e,r) readdir_r(d,e,r)
 169 #endif
 170
 171 #ifdef NO_ADDRINFO
 172 #       include <netdb.h>
 173 struct addrinfo {
 174         struct hostent *ai_hostent;
 175         struct servent *ai_servent;
 176         struct sockaddr_in ai_addr_in;
 177         struct sockaddr *ai_addr;
 178         size_t ai_addrlen;
 179         int ai_family;
 180         int ai_socktype;
 181         int ai_protocol;
 182         long ai_port;
 183         struct addrinfo *ai_next;
 184 };
 185
 186 extern int p_getaddrinfo(const char *host, const char *port,
 187         struct addrinfo *hints, struct addrinfo **info);
 188 extern void p_freeaddrinfo(struct addrinfo *info);
 189 extern const char *p_gai_strerror(int ret);
 190 #else
 191 #       define p_getaddrinfo(a, b, c, d) getaddrinfo(a, b, c, d)
 192 #       define p_freeaddrinfo(a) freeaddrinfo(a)
 193 #       define p_gai_strerror(c) gai_strerror(c)
 194 #endif /* NO_ADDRINFO */
 195
 196 #endif