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run-command: use BUG() to report bugs, not die() 

The slightly misleading name die_bug() of the function intended to
report a bug is actually called always, and only reports a bug if the
passed-in parameter `err` is non-zero.

It uses die_errno() to report the bug, to helpfully include the error
message corresponding to `err`.

However, as these messages indicate bugs, we really should use BUG().
And as BUG() is a macro to be able to report the exact file and line
number, we need to convert die_bug() to a macro instead of only
replacing the die_errno() by a call to BUG().

While at it, use a name more indicative of the purpose: CHECK_BUG().

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Johannes Schindelin 2018-05-02 11:38:31 +02:00 committed by Junio C Hamano
parent a86303cb5d
commit dde74d732f
1 changed files with 10 additions and 13 deletions
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23
run-command.c
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@ -471,15 +471,12 @@ struct atfork_state {
sigset_t old;
};

#ifndef NO_PTHREADS
static void bug_die(int err, const char *msg)
{
if (err) {
errno = err;
die_errno("BUG: %s", msg);
}
}
#endif
#define CHECK_BUG(err, msg) \
do { \
int e = (err); \
if (e) \
BUG("%s: %s", msg, strerror(e)); \
} while(0)

static void atfork_prepare(struct atfork_state *as)
{
@ -491,9 +488,9 @@ static void atfork_prepare(struct atfork_state *as)
if (sigprocmask(SIG_SETMASK, &all, &as->old))
die_errno("sigprocmask");
#else
bug_die(pthread_sigmask(SIG_SETMASK, &all, &as->old),
CHECK_BUG(pthread_sigmask(SIG_SETMASK, &all, &as->old),
"blocking all signals");
bug_die(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs),
CHECK_BUG(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs),
"disabling cancellation");
#endif
}
@ -504,9 +501,9 @@ static void atfork_parent(struct atfork_state *as)
if (sigprocmask(SIG_SETMASK, &as->old, NULL))
die_errno("sigprocmask");
#else
bug_die(pthread_setcancelstate(as->cs, NULL),
CHECK_BUG(pthread_setcancelstate(as->cs, NULL),
"re-enabling cancellation");
bug_die(pthread_sigmask(SIG_SETMASK, &as->old, NULL),
CHECK_BUG(pthread_sigmask(SIG_SETMASK, &as->old, NULL),
"restoring signal mask");
#endif
}