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log: improve handling of use-before-init

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Rather than segfaulting by attempting to traverse an initially
null log handler pointer, explicitly print a message and abort.

Signed-off-by: Matt Hoosier <matt.hoosier@gmail.com>
Reviewed-by: Ian Ray <ian.ray@ge.com>
[Pekka: coding style fix]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Matt Hoosier 2018-05-04 09:26:34 -05:00 committed by Pekka Paalanen
parent 577b346412
commit 74742e0525
1 changed files with 22 additions and 2 deletions
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24
libweston/log.c
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@ -36,8 +36,28 @@
#include "compositor.h"
static log_func_t log_handler = 0;
static log_func_t log_continue_handler = 0;
static int
default_log_handler(const char *fmt, va_list ap);
static log_func_t log_handler = default_log_handler;
static log_func_t log_continue_handler = default_log_handler;
/** Sentinel log message handler
*
* This function is used as the default handler for log messages. It
* exists only to issue a noisy reminder to the user that a real handler
* must be installed prior to issuing logging calls. The process is
* immediately aborted after the reminder is printed.
*
* \param fmt The format string. Ignored.
* \param va The variadic argument list. Ignored.
*/
static int
default_log_handler(const char *fmt, va_list ap)
{
fprintf(stderr, "weston_log_set_handler() must be called before using of weston_log().\n");
abort();
}
/** Install the log handler
*