[Bug 76398] [libc] stdio can lose data in the presence of signals

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=76398

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=86a16ada1ea608408cec370171d9f59353e97c77

commit 86a16ada1ea608408cec370171d9f59353e97c77
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2022-01-23 06:52:59 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2022-01-25 15:26:05 +0000

    __sflush(): on write error, if nothing was written, reset FILE state back

    otherwise the data is just dropped.  Check for current position equal to
    the buffer base at the entry of the function; if not equal, setvbuf()
    was done from the write method and it is not our business to override
    the decision.

    PR:     76398
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D34007

 lib/libc/stdio/fflush.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

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