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