util/log: Pass Error pointer to qemu_set_log

Do not force exit within qemu_set_log; return bool and pass
an Error value back up the stack as per usual.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220417183019.755276-5-richard.henderson@linaro.org>

bsd-user/main.c

@@ -414,7 +414,7 @@ int main(int argc, char **argv)
             qemu_print_log_usage(stdout);
             exit(1);
         }
-        qemu_set_log(mask);
+        qemu_set_log(mask, &error_fatal);
     }
 
     if (optind >= argc) {

include/qemu/log.h

@@ -147,7 +147,7 @@ typedef struct QEMULogItem {
 
 extern const QEMULogItem qemu_log_items[];
 
-void qemu_set_log(int log_flags);
+bool qemu_set_log(int log_flags, Error **errp);
 bool qemu_set_log_filename(const char *filename, Error **errp);
 void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
 bool qemu_log_in_addr_range(uint64_t addr);

linux-user/main.c

@@ -679,7 +679,7 @@ int main(int argc, char **argv, char **envp)
 
     log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
     if (log_mask) {
-        qemu_set_log(log_mask);
+        qemu_set_log(log_mask, &error_fatal);
     }
 
     if (!trace_init_backends()) {

monitor/misc.c

@@ -428,6 +428,7 @@ static void hmp_log(Monitor *mon, const QDict *qdict)
 {
     int mask;
     const char *items = qdict_get_str(qdict, "items");
+    Error *err = NULL;
 
     if (!strcmp(items, "none")) {
         mask = 0;
@@ -438,7 +439,10 @@ static void hmp_log(Monitor *mon, const QDict *qdict)
             return;
         }
     }
-    qemu_set_log(mask);
+
+    if (!qemu_set_log(mask, &err)) {
+        error_report_err(err);
+    }
 }
 
 static void hmp_singlestep(Monitor *mon, const QDict *qdict)

qemu-img.c

@@ -5443,7 +5443,7 @@ int main(int argc, char **argv)
         exit(1);
     }
     trace_init_file();
-    qemu_set_log(LOG_TRACE);
+    qemu_set_log(LOG_TRACE, &error_fatal);
 
     /* find the command */
     for (cmd = img_cmds; cmd->name != NULL; cmd++) {

qemu-io.c

@@ -634,7 +634,7 @@ int main(int argc, char **argv)
         exit(1);
     }
     trace_init_file();
-    qemu_set_log(LOG_TRACE);
+    qemu_set_log(LOG_TRACE, &error_fatal);
 
     /* initialize commands */
     qemuio_add_command(&quit_cmd);

qemu-nbd.c

@@ -804,7 +804,7 @@ int main(int argc, char **argv)
         exit(1);
     }
     trace_init_file();
-    qemu_set_log(LOG_TRACE);
+    qemu_set_log(LOG_TRACE, &error_fatal);
 
     socket_activation = check_socket_activation();
     if (socket_activation == 0) {

scsi/qemu-pr-helper.c

@@ -1001,7 +1001,7 @@ int main(int argc, char **argv)
         exit(EXIT_FAILURE);
     }
     trace_init_file();
-    qemu_set_log(LOG_TRACE);
+    qemu_set_log(LOG_TRACE, &error_fatal);
 
 #ifdef CONFIG_MPATH
     dm_init();

softmmu/vl.c

@@ -2570,9 +2570,9 @@ static void qemu_process_early_options(void)
             qemu_print_log_usage(stdout);
             exit(1);
         }
-        qemu_set_log(mask);
+        qemu_set_log(mask, &error_fatal);
     } else {
-        qemu_set_log(0);
+        qemu_set_log(0, &error_fatal);
     }
 
     qemu_add_default_firmwarepath();

storage-daemon/qemu-storage-daemon.c

@@ -392,7 +392,7 @@ int main(int argc, char *argv[])
     if (!trace_init_backends()) {
         return EXIT_FAILURE;
     }
-    qemu_set_log(LOG_TRACE);
+    qemu_set_log(LOG_TRACE, &error_fatal);
 
     qemu_init_main_loop(&error_fatal);
     process_options(argc, argv, false);

tests/unit/test-logging.c

@@ -122,7 +122,7 @@ static void test_logfile_write(gconstpointer data)
      * In cases where a logging backend other than log is used,
      * this is needed.
      */
-    qemu_set_log(CPU_LOG_TB_OUT_ASM);
+    qemu_set_log(CPU_LOG_TB_OUT_ASM, &error_abort);
     file_path = g_build_filename(dir, "qemu_test_log_write0.log", NULL);
     file_path1 = g_build_filename(dir, "qemu_test_log_write1.log", NULL);
 

util/log.c

@@ -73,7 +73,7 @@ static void qemu_logfile_free(QemuLogFile *logfile)
 }
 
 /* enable or disable low levels log */
-void qemu_set_log(int log_flags)
+bool qemu_set_log(int log_flags, Error **errp)
 {
     bool need_to_open_file = false;
     QemuLogFile *logfile;
@@ -103,9 +103,9 @@ void qemu_set_log(int log_flags)
         if (logfilename) {
             logfile->fd = fopen(logfilename, log_append ? "a" : "w");
             if (!logfile->fd) {
-                g_free(logfile);
-                perror(logfilename);
-                _exit(1);
+                error_setg_errno(errp, errno, "Error opening logfile %s",
+                                 logfilename);
+                return false;
             }
             /* In case we are a daemon redirect stderr to logfile */
             if (is_daemonized()) {
@@ -129,6 +129,7 @@ void qemu_set_log(int log_flags)
         log_append = 1;
         qatomic_rcu_set(&qemu_logfile, logfile);
     }
+    return true;
 }
 
 /*
@@ -159,8 +160,7 @@ bool qemu_set_log_filename(const char *filename, Error **errp)
     }
 
     qemu_log_close();
-    qemu_set_log(qemu_loglevel);
-    return true;
+    return qemu_set_log(qemu_loglevel, errp);
 }
 
 /* Returns true if addr is in our debug filter or no filter defined