[PATCH 2/2] log: use freopen() to reopen standard streams

In glibc stdin, stdout & stderr are variables that can be assigned to
(https://www.gnu.org/software/libc/manual/html_node/Standard-Streams.html)
however this not necessarily true of other C libraries.

The gentoo musl porting notes
(https://wiki.gentoo.org/wiki/Musl_porting_notes)
recommend the substitution of

    stdX = fopen(...)

with

    freopen(..., stdX)

Signed-off-by: Simon Rowe <[email protected]>
---
 lib/log/log.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/log/log.c b/lib/log/log.c
index 118a3ba42..a94016d81 100644
--- a/lib/log/log.c
+++ b/lib/log/log.c
@@ -208,7 +208,11 @@ int reopen_standard_stream(FILE **stream, const char *mode)
 
 	_check_and_replace_standard_log_streams(old_stream, new_stream);
 
+#ifdef __GLIBC__
 	*stream = new_stream;
+#else
+	freopen(NULL, mode, *stream);
+#endif
 	return 1;
 }
 
-- 
2.22.3

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