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qemu_set_log_filename: filename argument may be NULL

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NULL is a valid log filename used to indicate we want to use stderr
but qemu_set_log_filename (which is called by bsd-user/main.c) was not
handling it correctly.

That also made redundant a couple of NULL checks in calling code which
have been removed.

Signed-off-by: Salvador Fandino <salvador@qindel.com>
Message-Id: <20200123193626.19956-1-salvador@qindel.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Salvador Fandino 2020-01-23 20:36:26 +01:00 • committed by Stefan Hajnoczi
parent d4aceb2eb7
commit e144a605a6
3 changed files with 18 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

28
util/log.c
View file

@ -148,25 +148,29 @@ void qemu_log_needs_buffers(void)
* Allow the user to include %d in their logfile which will be
* substituted with the current PID. This is useful for debugging many
* nested linux-user tasks but will result in lots of logs.
*
* filename may be NULL. In that case, log output is sent to stderr
*/
void qemu_set_log_filename(const char *filename, Error **errp)
{
char *pidstr;
g_free(logfilename);
logfilename = NULL;
pidstr = strstr(filename, "%");
if (pidstr) {
/* We only accept one %d, no other format strings */
if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) {
error_setg(errp, "Bad logfile format: %s", filename);
return;
} else {
logfilename = g_strdup_printf(filename, getpid());
}
} else {
logfilename = g_strdup(filename);
if (filename) {
char *pidstr = strstr(filename, "%");
if (pidstr) {
/* We only accept one %d, no other format strings */
if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) {
error_setg(errp, "Bad logfile format: %s", filename);
return;
} else {
logfilename = g_strdup_printf(filename, getpid());
}
} else {
logfilename = g_strdup(filename);
}
}
qemu_log_close();
qemu_set_log(qemu_loglevel);
}