glibc/stdio-common/tst-freopen64-3.c

#define FREOPEN freopen64
#include <tst-freopen3-main.c>
Add more thorough tests of freopen freopen is rather minimally tested in libio/tst-freopen and libio/test-freopen. Add some more thorough tests, covering different cases for change of mode in particular. The tests are run for both freopen and freopen64 (given that those functions have two separate copies of much of the code, so any bug fix directly in the freopen code would probably need applying in both places). Note that there are two parts of the tests disabled because of bugs discovered through running the tests, with bug numbers given in comments. I expect to address those separately. The tests also don't cover changes to cancellation ("c" in mode); I think that will better be handled through a separate test. Also to handle separately: testing on stdin / stdout / stderr; documenting lack of support for streams opened with popen / fmemopen / open_memstream / fopencookie; maybe also a chroot test without /proc; maybe also more thorough tests for large file handling on 32-bit systems (freopen64). Tested for x86_64. 2024-09-04 16:32:21 +00:00			`#define FREOPEN freopen64`
			`#include <tst-freopen3-main.c>`