| buffer_mmapread(3) | Library Functions Manual | buffer_mmapread(3) |
buffer_mmapread - create read-only memory-mapped file buffer
#include <libowfat/buffer.h>
int buffer_mmapread(buffer &b,const char* filename);
buffer_mmapread opens filename for reading and fills b 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.
#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);
buffer_mmapread returns 0 if everything was fine, -1 on error (setting errno).