fopen fails to open +4GB file

by frank · April 28, 2015

fopen() returns null on large files above 4GB.

Solution: Compile your program with this flag:

CFLAGS+=-D_FILE_OFFSET_BITS=64

Or find the equivalent flag for your compiler.

I first experience this problem when using lighttpd to provide a .mp4 larger than 4G, it would fail with the error : 502 Bad Gateway.

From the sources :

* mod_fastcgi: Send 502 "Bad Gateway" if we couldn't open the file for X-Sendfile (fixes #2226)

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