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| author | Rich Felker <dalias@aerifal.cx> | 2020-08-30 21:30:37 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2020-08-30 21:30:37 -0400 |
| commit | cf27184d00c1588eccac71a3bc89c9798e60bbd9 (patch) | |
| tree | da4a97411eaf7a9f307fbf8aaab2ec0a959882ef | |
| parent | cab0a8fb8d9a1095de3e4c2227bfc37fae93f781 (diff) | |
| download | musl-cf27184d00c1588eccac71a3bc89c9798e60bbd9.tar.gz musl-cf27184d00c1588eccac71a3bc89c9798e60bbd9.tar.bz2 musl-cf27184d00c1588eccac71a3bc89c9798e60bbd9.tar.xz musl-cf27184d00c1588eccac71a3bc89c9798e60bbd9.zip | |
restore h_errno ABI compatibility with ancient binaries
prior to commit e68c51ac46a9f273927aef8dcebc89912ab19ece, h_errno was
actually an external data object not a macro. bring back the symbol,
and use it as the storage for the main thread's h_errno.
technically this still doesn't provide full compatibility if the
application was multithreaded, but at the time there were no res_*
functions (and they did not set h_errno anyway), so any use of h_errno
would have been via thread-unsafe functions. thus a solution that just
fixes single-threaded applications seems acceptable.
| -rw-r--r-- | src/network/h_errno.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/network/h_errno.c b/src/network/h_errno.c index 8677a92b..638f7718 100644 --- a/src/network/h_errno.c +++ b/src/network/h_errno.c @@ -1,7 +1,11 @@ #include <netdb.h> #include "pthread_impl.h" +#undef h_errno +int h_errno; + int *__h_errno_location(void) { + if (!__pthread_self()->stack) return &h_errno; return &__pthread_self()->h_errno_val; } |