Reading too few bytes

[Paul J. Lucas]

Here's a small test program:

        #include <fcntl.h>
        #include <cstdlib>
        #include <iostream>
        
        using namespace std;
        
        int main() {
            int fd = ::open( "ESLF", O_RDONLY );
            if ( fd == -1 ) {
                cerr << "could not open ESLF file" << endl;
                ::exit( 1 );
            }
            char buf[ 64 ];
            ssize_t bytesRead = ::read( fd, buf, sizeof( buf ) );
            cout << "read " << bytesRead << " bytes" << endl;
            ::close( fd );
        }

Here's the contents of a small biinary file "ESLF" (printed in hex bytes):

        54 39 CA 1A 44

When I compile the program as:

        g++ -o test test.cpp

and run it, it prints "read 5 bytes" as one would expect.  When I compile
the program as:

        g++ -mno-cygwin -o test test.cpp

and run it, it prints "read 3 bytes".  Why?  How do I teg it to read all
5 bytes?

- Paul


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