thodg/libgit2/src/posix.h

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• Hash : 4ce8e01a
  Author :
  Date : 2020-06-17T14:31:11
  

  Support build with NO_MMAP to disable use of system mmap * Use pread/pwrite to avoid updating position in file descriptor * Emulate missing pread/pwrite on win32 using overlapped file IO

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• src/posix.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_posix_h__
  #define INCLUDE_posix_h__
  
  #include "common.h"
  
  #include <fcntl.h>
  #include <time.h>
  
  /* stat: file mode type testing macros */
  #ifndef S_IFGITLINK
  #define S_IFGITLINK 0160000
  #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
  #endif
  
  #ifndef S_IFLNK
  #define S_IFLNK 0120000
  #undef _S_IFLNK
  #define _S_IFLNK S_IFLNK
  #endif
  
  #ifndef S_IWUSR
  #define S_IWUSR 00200
  #endif
  
  #ifndef S_IXUSR
  #define S_IXUSR 00100
  #endif
  
  #ifndef S_ISLNK
  #define S_ISLNK(m) (((m) & _S_IFMT) == _S_IFLNK)
  #endif
  
  #ifndef S_ISDIR
  #define S_ISDIR(m) (((m) & _S_IFMT) == _S_IFDIR)
  #endif
  
  #ifndef S_ISREG
  #define S_ISREG(m) (((m) & _S_IFMT) == _S_IFREG)
  #endif
  
  #ifndef S_ISFIFO
  #define S_ISFIFO(m) (((m) & _S_IFMT) == _S_IFIFO)
  #endif
  
  /* if S_ISGID is not defined, then don't try to set it */
  #ifndef S_ISGID
  #define S_ISGID 0
  #endif
  
  #ifndef O_BINARY
  #define O_BINARY 0
  #endif
  #ifndef O_CLOEXEC
  #define O_CLOEXEC 0
  #endif
  #ifndef SOCK_CLOEXEC
  #define SOCK_CLOEXEC 0
  #endif
  
  /* access() mode parameter #defines	*/
  #ifndef F_OK
  #define F_OK 0 /* existence check */
  #endif
  #ifndef W_OK
  #define W_OK 2 /* write mode check */
  #endif
  #ifndef R_OK
  #define R_OK 4 /* read mode check */
  #endif
  
  /* Determine whether an errno value indicates that a read or write failed
   * because the descriptor is blocked.
   */
  #if defined(EWOULDBLOCK)
  #define GIT_ISBLOCKED(e) ((e) == EAGAIN || (e) == EWOULDBLOCK)
  #else
  #define GIT_ISBLOCKED(e) ((e) == EAGAIN)
  #endif
  
  /* define some standard errnos that the runtime may be missing.  for example,
   * mingw lacks EAFNOSUPPORT. */
  #ifndef EAFNOSUPPORT
  #define EAFNOSUPPORT (INT_MAX-1)
  #endif
  
  /* Compiler independent macro to handle signal interrpted system calls */
  #define HANDLE_EINTR(result, x) do {					\
  		result = (x);						\
  	} while (result == -1 && errno == EINTR);
  
  
  /* Provide a 64-bit size for offsets. */
  
  #if defined(_MSC_VER)
  typedef __int64 off64_t;
  #elif defined(__HAIKU__)
  typedef __haiku_std_int64 off64_t;
  #elif defined(__APPLE__)
  typedef __int64_t off64_t;
  #else
  typedef int64_t off64_t;
  #endif
  
  typedef int git_file;
  
  /**
   * Standard POSIX Methods
   *
   * All the methods starting with the `p_` prefix are
   * direct ports of the standard POSIX methods.
   *
   * Some of the methods are slightly wrapped to provide
   * saner defaults. Some of these methods are emulated
   * in Windows platforms.
   *
   * Use your manpages to check the docs on these.
   */
  
  extern ssize_t p_read(git_file fd, void *buf, size_t cnt);
  extern int p_write(git_file fd, const void *buf, size_t cnt);
  
  extern ssize_t p_pread(int fd, void *data, size_t size, off64_t offset);
  extern ssize_t p_pwrite(int fd, const void *data, size_t size, off64_t offset);
  
  #define p_close(fd) close(fd)
  #define p_umask(m) umask(m)
  
  extern int p_open(const char *path, int flags, ...);
  extern int p_creat(const char *path, mode_t mode);
  extern int p_getcwd(char *buffer_out, size_t size);
  extern int p_rename(const char *from, const char *to);
  
  extern int git__page_size(size_t *page_size);
  extern int git__mmap_alignment(size_t *page_size);
  
  /* The number of times `p_fsync` has been called.  Note that this is for
   * test code only; it it not necessarily thread-safe and should not be
   * relied upon in production.
   */
  extern size_t p_fsync__cnt;
  
  /**
   * Platform-dependent methods
   */
  #ifdef GIT_WIN32
  #	include "win32/posix.h"
  #else
  #	include "unix/posix.h"
  #endif
  
  #include "strnlen.h"
  
  #ifdef NO_READDIR_R
  GIT_INLINE(int) p_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
  {
  	GIT_UNUSED(entry);
  	*result = readdir(dirp);
  	return 0;
  }
  #else /* NO_READDIR_R */
  #	define p_readdir_r(d,e,r) readdir_r(d,e,r)
  #endif
  
  #ifdef NO_ADDRINFO
  #	include <netdb.h>
  struct addrinfo {
  	struct hostent *ai_hostent;
  	struct servent *ai_servent;
  	struct sockaddr_in ai_addr_in;
  	struct sockaddr *ai_addr;
  	size_t ai_addrlen;
  	int ai_family;
  	int ai_socktype;
  	int ai_protocol;
  	long ai_port;
  	struct addrinfo *ai_next;
  };
  
  extern int p_getaddrinfo(const char *host, const char *port,
  	struct addrinfo *hints, struct addrinfo **info);
  extern void p_freeaddrinfo(struct addrinfo *info);
  extern const char *p_gai_strerror(int ret);
  #else
  #	define p_getaddrinfo(a, b, c, d) getaddrinfo(a, b, c, d)
  #	define p_freeaddrinfo(a) freeaddrinfo(a)
  #	define p_gai_strerror(c) gai_strerror(c)
  #endif /* NO_ADDRINFO */
  
  #endif
  

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