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usage: allow pluggable die-recursion checks

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When any git code calls die or die_errno, we use a counter
to detect recursion into the die functions from any of the
helper functions. However, such a simple counter is not good
enough for threaded programs, which may call die from a
sub-thread, killing only the sub-thread (but incrementing
the counter for everyone).

Rather than try to deal with threads ourselves here, let's
just allow callers to plug in their own recursion-detection
function. This is similar to how we handle the die routine
(the caller plugs in a die routine which may kill only the
sub-thread).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2013-04-16 15:46:22 -04:00 committed by Junio C Hamano
parent 04a74b6cfa
commit c19a490e37
2 changed files with 15 additions and 6 deletions
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1
git-compat-util.h
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@ -301,6 +301,7 @@ extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)))
extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
extern void set_error_routine(void (*routine)(const char *err, va_list params));
extern void set_die_is_recursing_routine(int (*routine)(void));
extern int prefixcmp(const char *str, const char *prefix);
extern int suffixcmp(const char *str, const char *suffix);

20
usage.c
View File

@ -6,8 +6,6 @@
#include "git-compat-util.h"
#include "cache.h"
static int dying;
void vreportf(const char *prefix, const char *err, va_list params)
{
char msg[4096];
@ -49,12 +47,19 @@ static void warn_builtin(const char *warn, va_list params)
vreportf("warning: ", warn, params);
}
static int die_is_recursing_builtin(void)
{
static int dying;
return dying++;
}
/* If we are in a dlopen()ed .so write to a global variable would segfault
* (ugh), so keep things static. */
static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
static void (*error_routine)(const char *err, va_list params) = error_builtin;
static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
static int (*die_is_recursing)(void) = die_is_recursing_builtin;
void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
{
@ -66,6 +71,11 @@ void set_error_routine(void (*routine)(const char *err, va_list params))
error_routine = routine;
}
void set_die_is_recursing_routine(int (*routine)(void))
{
die_is_recursing = routine;
}
void NORETURN usagef(const char *err, ...)
{
va_list params;
@ -84,11 +94,10 @@ void NORETURN die(const char *err, ...)
{
va_list params;
if (dying) {
if (die_is_recursing()) {
fputs("fatal: recursion detected in die handler\n", stderr);
exit(128);
}
dying = 1;
va_start(params, err);
die_routine(err, params);
@ -102,12 +111,11 @@ void NORETURN die_errno(const char *fmt, ...)
char str_error[256], *err;
int i, j;
if (dying) {
if (die_is_recursing()) {
fputs("fatal: recursion detected in die_errno handler\n",
stderr);
exit(128);
}
dying = 1;
err = strerror(errno);
for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {