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#include "internal.h"
mmap·Reader
mmap·open(byte *filename)
{
int fd;
int err;
void *buf;
io·Stream *s;
io·Stat st;
s = io·open(filename, "r");
fd = io·fd(s);
err = io·stat(s, &st);
if(err){
errorf("file stat: error code %d", err);
goto ERROR;
}
buf = mmap(nil, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if(!buf){
errorf("mmap: failed");
goto ERROR;
}
// NOTE: posix systems require that reference kept to mmap file after fd is closed
io·close(s);
return (mmap·Reader){.len=st.st_size, .b=buf};
ERROR:
io·close(s);
return (mmap·Reader){ 0 };
}
int
mmap·close(mmap·Reader rdr)
{
munmap(rdr.b, rdr.len);
return 0;
}
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