trace: remove argument from trace_init_file

It is not needed, all the callers are just saving what was
retrieved from -trace and trace_init_file can retrieve it
on its own.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20201102115841.4017692-1-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

bsd-user/main.c

@@ -745,7 +745,6 @@ int main(int argc, char **argv)
     const char *gdbstub = NULL;
     char **target_environ, **wrk;
     envlist_t *envlist = NULL;
-    char *trace_file = NULL;
     bsd_type = target_openbsd;
 
     if (argc <= 1)
@@ -851,8 +850,7 @@ int main(int argc, char **argv)
         } else if (!strcmp(r, "strace")) {
             do_strace = 1;
         } else if (!strcmp(r, "trace")) {
-            g_free(trace_file);
-            trace_file = trace_opt_parse(optarg);
+            trace_opt_parse(optarg);
         } else {
             usage();
         }
@@ -880,7 +878,7 @@ int main(int argc, char **argv)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
 
     /* Zero out regs */
     memset(regs, 0, sizeof(struct target_pt_regs));

linux-user/main.c

@@ -386,11 +386,9 @@ static void handle_arg_version(const char *arg)
     exit(EXIT_SUCCESS);
 }
 
-static char *trace_file;
 static void handle_arg_trace(const char *arg)
 {
-    g_free(trace_file);
-    trace_file = trace_opt_parse(arg);
+    trace_opt_parse(arg);
 }
 
 #if defined(TARGET_XTENSA)
@@ -672,7 +670,7 @@ int main(int argc, char **argv, char **envp)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
     if (qemu_plugin_load_list(&plugins)) {
         exit(1);
     }

qemu-img.c

@@ -5466,7 +5466,6 @@ int main(int argc, char **argv)
     const img_cmd_t *cmd;
     const char *cmdname;
     Error *local_error = NULL;
-    char *trace_file = NULL;
     int c;
     static const struct option long_options[] = {
         {"help", no_argument, 0, 'h'},
@@ -5516,8 +5515,7 @@ int main(int argc, char **argv)
             printf(QEMU_IMG_VERSION);
             return 0;
         case 'T':
-            g_free(trace_file);
-            trace_file = trace_opt_parse(optarg);
+            trace_opt_parse(optarg);
             break;
         }
     }
@@ -5535,7 +5533,7 @@ int main(int argc, char **argv)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
     qemu_set_log(LOG_TRACE);
 
     /* find the command */

qemu-io.c

@@ -536,7 +536,6 @@ int main(int argc, char **argv)
     Error *local_error = NULL;
     QDict *opts = NULL;
     const char *format = NULL;
-    char *trace_file = NULL;
     bool force_share = false;
 
 #ifdef CONFIG_POSIX
@@ -601,8 +600,7 @@ int main(int argc, char **argv)
             }
             break;
         case 'T':
-            g_free(trace_file);
-            trace_file = trace_opt_parse(optarg);
+            trace_opt_parse(optarg);
             break;
         case 'V':
             printf("%s version " QEMU_FULL_VERSION "\n"
@@ -653,7 +651,7 @@ int main(int argc, char **argv)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
     qemu_set_log(LOG_TRACE);
 
     /* initialize commands */

qemu-nbd.c

@@ -581,7 +581,6 @@ int main(int argc, char **argv)
     const char *tlscredsid = NULL;
     bool imageOpts = false;
     bool writethrough = true;
-    char *trace_file = NULL;
     bool fork_process = false;
     bool list = false;
     int old_stderr = -1;
@@ -768,8 +767,7 @@ int main(int argc, char **argv)
             imageOpts = true;
             break;
         case 'T':
-            g_free(trace_file);
-            trace_file = trace_opt_parse(optarg);
+            trace_opt_parse(optarg);
             break;
         case QEMU_NBD_OPT_TLSAUTHZ:
             tlsauthz = optarg;
@@ -816,7 +814,7 @@ int main(int argc, char **argv)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
     qemu_set_log(LOG_TRACE);
 
     socket_activation = check_socket_activation();

scsi/qemu-pr-helper.c

@@ -884,7 +884,6 @@ int main(int argc, char **argv)
     int quiet = 0;
     int ch;
     Error *local_err = NULL;
-    char *trace_file = NULL;
     bool daemonize = false;
     bool pidfile_specified = false;
     bool socket_path_specified = false;
@@ -968,8 +967,7 @@ int main(int argc, char **argv)
             ++loglevel;
             break;
         case 'T':
-            g_free(trace_file);
-            trace_file = trace_opt_parse(optarg);
+            trace_opt_parse(optarg);
             break;
         case 'V':
             version(argv[0]);
@@ -992,7 +990,7 @@ int main(int argc, char **argv)
     if (!trace_init_backends()) {
         exit(EXIT_FAILURE);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
     qemu_set_log(LOG_TRACE);
 
 #ifdef CONFIG_MPATH

softmmu/vl.c

@@ -2886,7 +2886,6 @@ void qemu_init(int argc, char **argv, char **envp)
     int display_remote = 0;
     const char *log_mask = NULL;
     const char *log_file = NULL;
-    char *trace_file = NULL;
     ram_addr_t maxram_size;
     uint64_t ram_slots = 0;
     FILE *vmstate_dump_file = NULL;
@@ -3688,8 +3687,7 @@ void qemu_init(int argc, char **argv, char **envp)
                 xen_domid_restrict = true;
                 break;
             case QEMU_OPTION_trace:
-                g_free(trace_file);
-                trace_file = trace_opt_parse(optarg);
+                trace_opt_parse(optarg);
                 break;
             case QEMU_OPTION_plugin:
                 qemu_plugin_opt_parse(optarg, &plugin_list);
@@ -3939,7 +3937,7 @@ void qemu_init(int argc, char **argv, char **envp)
     if (!trace_init_backends()) {
         exit(1);
     }
-    trace_init_file(trace_file);
+    trace_init_file();
 
     /* Open the logfile at this point and set the log mask if necessary.
      */

storage-daemon/qemu-storage-daemon.c

@@ -180,12 +180,9 @@ static void process_options(int argc, char *argv[])
             help();
             exit(EXIT_SUCCESS);
         case 'T':
-            {
-                char *trace_file = trace_opt_parse(optarg);
-                trace_init_file(trace_file);
-                g_free(trace_file);
-                break;
-            }
+            trace_opt_parse(optarg);
+            trace_init_file();
+            break;
         case 'V':
             printf("qemu-storage-daemon version "
                    QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n");

trace/control.c

@@ -222,8 +222,10 @@ static void trace_init_events(const char *fname)
     loc_pop(&loc);
 }
 
-void trace_init_file(const char *file)
+void trace_init_file(void)
 {
+    QemuOpts *opts = qemu_find_opts_singleton("trace");
+    const char *file = qemu_opt_get(opts, "file");
 #ifdef CONFIG_TRACE_SIMPLE
     st_set_trace_file(file);
     if (init_trace_on_startup) {
@@ -289,9 +291,8 @@ bool trace_init_backends(void)
     return true;
 }
 
-char *trace_opt_parse(const char *optarg)
+void trace_opt_parse(const char *optarg)
 {
-    char *trace_file;
     QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
                                              optarg, true);
     if (!opts) {
@@ -301,11 +302,8 @@ char *trace_opt_parse(const char *optarg)
         trace_enable_events(qemu_opt_get(opts, "enable"));
     }
     trace_init_events(qemu_opt_get(opts, "events"));
-    trace_file = g_strdup(qemu_opt_get(opts, "file"));
     init_trace_on_startup = true;
     qemu_opts_del(opts);
-
-    return trace_file;
 }
 
 uint32_t trace_get_vcpu_event_count(void)

trace/control.h

@@ -167,8 +167,6 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
 
 /**
  * trace_init_backends:
- * @file:   Name of trace output file; may be NULL.
- *          Corresponds to commandline option "--trace file=...".
  *
  * Initialize the tracing backend.
  *
@@ -178,14 +176,12 @@ bool trace_init_backends(void);
 
 /**
  * trace_init_file:
- * @file:   Name of trace output file; may be NULL.
- *          Corresponds to commandline option "--trace file=...".
  *
  * Record the name of the output file for the tracing backend.
  * Exits if no selected backend does not support specifying the
- * output file, and a non-NULL file was passed.
+ * output file, and a file was specified with "-trace file=...".
  */
-void trace_init_file(const char *file);
+void trace_init_file(void);
 
 /**
  * trace_init_vcpu:
@@ -229,10 +225,8 @@ extern QemuOptsList qemu_trace_opts;
  * @optarg: A string argument of --trace command line argument
  *
  * Initialize tracing subsystem.
- *
- * Returns the filename to save trace to.  It must be freed with g_free().
  */
-char *trace_opt_parse(const char *optarg);
+void trace_opt_parse(const char *optarg);
 
 /**
  * trace_get_vcpu_event_count: