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Note that reentrant calls to libevent from logging cbs may fail badly

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This commit is contained in:
Nick Mathewson 2010-11-23 12:26:34 -05:00
parent 7bcace2d54
commit e431bcd686
1 changed files with 7 additions and 0 deletions
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7
include/event2/event.h
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@ -280,6 +280,10 @@ void event_base_free(struct event_base *);
#define _EVENT_LOG_MSG 1 #define _EVENT_LOG_MSG 1
#define _EVENT_LOG_WARN 2 #define _EVENT_LOG_WARN 2
#define _EVENT_LOG_ERR 3 #define _EVENT_LOG_ERR 3
/*
A callback function used to intercept Libevent's log messages.
*/
typedef void (*event_log_cb)(int severity, const char *msg); typedef void (*event_log_cb)(int severity, const char *msg);
/** /**
Redirect Libevent's log messages. Redirect Libevent's log messages.
@ -287,6 +291,9 @@ typedef void (*event_log_cb)(int severity, const char *msg);
@param cb a function taking two arguments: an integer severity between @param cb a function taking two arguments: an integer severity between
_EVENT_LOG_DEBUG and _EVENT_LOG_ERR, and a string. If cb is NULL, _EVENT_LOG_DEBUG and _EVENT_LOG_ERR, and a string. If cb is NULL,
then the default log is used. then the default log is used.
NOTE: The function you provide *must not* call any other libevent
functionality. Doing so can produce undefined behavior.
*/ */
void event_set_log_callback(event_log_cb cb); void event_set_log_callback(event_log_cb cb);