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#include "internal.h"
mmap·Reader
mmap·open(byte *filename)
{
int err;
void *buf;
io·Buffer io;
sys·Info info;
mmap·Reader rdr = {0};
if(io·open(filename, sys·ORead, &io)){
errorf("failed to open %s", filename);
goto done;
}
if(sys·infofd(io.fd, &info)){
errorf("file stat: error code %d", err);
goto done;
}
if(sys·mmap(nil, info.size, sys·ProtRead, sys·MapShared, io.fd, 0, &buf)){
errorf("mmap: failed");
goto done;
}
// NOTE: posix systems require that reference kept to mmap file after fd is closed
rdr = (mmap·Reader){.len=info.size, .b=buf};
done:
io·close((io·Header*)&io);
return rdr;
}
int
mmap·close(mmap·Reader rdr)
{
sys·munmap(rdr.b, rdr.len);
return 0;
}
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