• Jeff King's avatar
    write_or_die: raise SIGPIPE when we get EPIPE · 756e676c
    Jeff King authored
    The write_or_die function will always die on an error,
    including EPIPE. However, it currently treats EPIPE
    specially by suppressing any error message, and by exiting
    with exit code 0.
    
    Suppressing the error message makes some sense; a pipe death
    may just be a sign that the other side is not interested in
    what we have to say. However, exiting with a successful
    error code is not a good idea, as write_or_die is frequently
    used in cases where we want to be careful about having
    written all of the output, and we may need to signal to our
    caller that we have done so (e.g., you would not want a push
    whose other end has hung up to report success).
    
    This distinction doesn't typically matter in git, because we
    do not ignore SIGPIPE in the first place. Which means that
    we will not get EPIPE, but instead will just die when we get
    a SIGPIPE. But it's possible for a default handler to be set
    by a parent process, or for us to add a callsite inside one
    of our few SIGPIPE-ignoring blocks of code.
    
    This patch converts write_or_die to actually raise SIGPIPE
    when we see EPIPE, rather than exiting with zero. This
    brings the behavior in line with the "normal" case that we
    die from SIGPIPE (and any callers who want to check why we
    died will see the same thing). We also give the same
    treatment to other related functions, including
    write_or_whine_pipe and maybe_flush_or_die.
    Signed-off-by: default avatarJeff King <peff@peff.net>
    Signed-off-by: default avatarJunio C Hamano <gitster@pobox.com>
    756e676c
write_or_die.c 1.92 KB