thodg/libgit2/src/unix/map.c

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• Hash : 450ac186
  Author :
  Date : 2011-05-19T15:29:22
  

  unix/map.c: Move to new error handling mechanism

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• src/unix/map.c

• 
  #include "map.h"
  #include <sys/mman.h>
  #include <errno.h>
  
  
  int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
  {
  	int mprot = 0;
  	int mflag = 0;
  
  	assert((out != NULL) && (len > 0));
  
  	if ((out == NULL) || (len == 0)) {
  		errno = EINVAL;
  		return git__throw(GIT_ERROR, "Failed to mmap. No map or zero length");
  	}
  
  	out->data = NULL;
  	out->len = 0;
  
  	if (prot & GIT_PROT_WRITE)
  		mprot = PROT_WRITE;
  	else if (prot & GIT_PROT_READ)
  		mprot = PROT_READ;
  	else {
  		errno = EINVAL;
  		return git__throw(GIT_ERROR, "Failed to mmap. Invalid protection parameters");
  	}
  
  	if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
  		mflag = MAP_SHARED;
  	else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
  		mflag = MAP_PRIVATE;
  
  	if (flags & GIT_MAP_FIXED) {
  		errno = EINVAL;
  		return git__throw(GIT_ERROR, "Failed to mmap. FIXED not set");
  	}
  
  	out->data = mmap(NULL, len, mprot, mflag, fd, offset);
  	if (!out->data || out->data == MAP_FAILED)
  		return git__throw(GIT_EOSERR, "Failed to mmap. Could not write data");
  	out->len = len;
  
  	return GIT_SUCCESS;
  }
  
  int git__munmap(git_map *map)
  {
  	assert(map != NULL);
  
  	if (!map)
  		return git__throw(GIT_ERROR, "Failed to munmap. Map does not exist");
  
  	munmap(map->data, map->len);
  
  	return GIT_SUCCESS;
  }
  
  
  

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