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log: do not log if QEMU is daemonized but without -D

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Commit 96c33a4 ("log: Redirect stderr to logfile if deamonized",
2016-02-22) wanted to move stderr of a daemonized QEMU to the file
specified with -D.

However, if -D was not passed, the patch had the side effect of not
redirecting stderr to /dev/null.  This happened because qemu_logfile
was set to stderr rather than the expected value of NULL.  The fix
is simply in the "if" condition of do_qemu_set_log; the "if" for
closing the file is also changed to match.

Reported-by: Jan Tomko <jtomko@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-02-29 12:18:40 +01:00
parent 1464ad45cd
commit c586eac336
1 changed files with 5 additions and 2 deletions
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7
util/log.c
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@ -56,7 +56,8 @@ void do_qemu_set_log(int log_flags, bool use_own_buffers)
#ifdef CONFIG_TRACE_LOG
qemu_loglevel |= LOG_TRACE;
#endif
if ((qemu_loglevel || is_daemonized()) && !qemu_logfile) {
if (!qemu_logfile &&
(is_daemonized() ? logfilename != NULL : qemu_loglevel)) {
if (logfilename) {
qemu_logfile = fopen(logfilename, log_append ? "a" : "w");
if (!qemu_logfile) {
@ -72,6 +73,7 @@ void do_qemu_set_log(int log_flags, bool use_own_buffers)
}
} else {
/* Default to stderr if no log file specified */
assert(!is_daemonized());
qemu_logfile = stderr;
}
/* must avoid mmap() usage of glibc by setting a buffer "by hand" */
@ -89,7 +91,8 @@ void do_qemu_set_log(int log_flags, bool use_own_buffers)
log_append = 1;
}
}
if (!qemu_loglevel && !is_daemonized() && qemu_logfile) {
if (qemu_logfile &&
(is_daemonized() ? logfilename == NULL : !qemu_loglevel)) {
qemu_log_close();
}
}