.TH buffer_mmapread 3
.SH NAME
buffer_mmapread \- create read-only memory-mapped file buffer
.SH SYNTAX
.B #include <libowfat/buffer.h>

int \fBbuffer_mmapread\fR(buffer &\fIb\fR,const char* \fIfilename\fR);
.SH DESCRIPTION
buffer_mmapread opens \fIfilename\fR for reading and fills \fIb\fR so
that the contents of the file can be read from it.  Using mmap is more
efficient than reading through a real buffer, but you have to call
buffer_close to unmap the memory in the end.
.SH EXAMPLE
  #include <libowfat/buffer.h>
  #include <libowfat/open.h>

  buffer input;
  char x;

  buffer_mmapread(&input,"/etc/passwd");
  while (buffer_get(&input,&x,1)==1) {
    buffer_put(buffer_1,&x,1);
    if (x=='\\n') break;
  }
  buffer_flush(buffer_1);
  buffer_close(&input);

.SH "RETURN VALUE"
\fBbuffer_mmapread\fR returns 0 if everything was fine, -1 on error
(setting \fIerrno\fR).

.SH "SEE ALSO"
buffer_flush(3), buffer(3)