perf env: Adopt perf_header__set_cmdline

Move this from two globals to perf_env global, that eventually will
be just perf_header->env or something else, to ease the refactoring
series, leave it as a global and go on reading more of its fields,
not as part of the header writing process but as a perf_env init one
that will be used for perf.data-less situations.

Tested-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-2j78tdf8zn1ci0y6ji15bifj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/env.c

@@ -1,6 +1,8 @@
 #include "env.h"
 #include "util.h"
 
+struct perf_env perf_env;
+
 void perf_env__exit(struct perf_env *env)
 {
 	zfree(&env->hostname);
@@ -17,3 +19,40 @@ void perf_env__exit(struct perf_env *env)
 	zfree(&env->pmu_mappings);
 	zfree(&env->cpu);
 }
+
+int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[])
+{
+	int i;
+
+	/*
+	 * If env->cmdline_argv has already been set, do not override it.  This allows
+	 * a command to set the cmdline, parse args and then call another
+	 * builtin function that implements a command -- e.g, cmd_kvm calling
+	 * cmd_record.
+	 */
+	if (env->cmdline_argv != NULL)
+		return 0;
+
+	/* do not include NULL termination */
+	env->cmdline_argv = calloc(argc, sizeof(char *));
+	if (env->cmdline_argv == NULL)
+		goto out_enomem;
+
+	/*
+	 * Must copy argv contents because it gets moved around during option
+	 * parsing:
+	 */
+	for (i = 0; i < argc ; i++) {
+		env->cmdline_argv[i] = argv[i];
+		if (env->cmdline_argv[i] == NULL)
+			goto out_free;
+	}
+
+	env->nr_cmdline = argc;
+
+	return 0;
+out_free:
+	zfree(&env->cmdline_argv);
+out_enomem:
+	return -ENOMEM;
+}

tools/perf/util/env.h

@@ -32,6 +32,10 @@ struct perf_env {
 	struct cpu_topology_map	*cpu;
 };
 
+extern struct perf_env perf_env;
+
 void perf_env__exit(struct perf_env *env);
 
+int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);
+
 #endif /* __PERF_ENV_H */

tools/perf/util/header.c

@@ -24,9 +24,6 @@
 #include "build-id.h"
 #include "data.h"
 
-static u32 header_argc;
-static const char **header_argv;
-
 /*
  * magic2 = "PERFILE2"
  * must be a numerical value to let the endianness
@@ -138,37 +135,6 @@ static char *do_read_string(int fd, struct perf_header *ph)
 	return NULL;
 }
 
-int
-perf_header__set_cmdline(int argc, const char **argv)
-{
-	int i;
-
-	/*
-	 * If header_argv has already been set, do not override it.
-	 * This allows a command to set the cmdline, parse args and
-	 * then call another builtin function that implements a
-	 * command -- e.g, cmd_kvm calling cmd_record.
-	 */
-	if (header_argv)
-		return 0;
-
-	header_argc = (u32)argc;
-
-	/* do not include NULL termination */
-	header_argv = calloc(argc, sizeof(char *));
-	if (!header_argv)
-		return -ENOMEM;
-
-	/*
-	 * must copy argv contents because it gets moved
-	 * around during option parsing
-	 */
-	for (i = 0; i < argc ; i++)
-		header_argv[i] = argv[i];
-
-	return 0;
-}
-
 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
 			    struct perf_evlist *evlist)
 {
@@ -405,8 +371,8 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 {
 	char buf[MAXPATHLEN];
 	char proc[32];
-	u32 i, n;
-	int ret;
+	u32 n;
+	int i, ret;
 
 	/*
 	 * actual atual path to perf binary
@@ -420,7 +386,7 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 	buf[ret] = '\0';
 
 	/* account for binary path */
-	n = header_argc + 1;
+	n = perf_env.nr_cmdline + 1;
 
 	ret = do_write(fd, &n, sizeof(n));
 	if (ret < 0)
@@ -430,8 +396,8 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 	if (ret < 0)
 		return ret;
 
-	for (i = 0 ; i < header_argc; i++) {
-		ret = do_write_string(fd, header_argv[i]);
+	for (i = 0 ; i < perf_env.nr_cmdline; i++) {
+		ret = do_write_string(fd, perf_env.cmdline_argv[i]);
 		if (ret < 0)
 			return ret;
 	}

tools/perf/util/parse-options.c

@@ -496,7 +496,7 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
 {
 	struct parse_opt_ctx_t ctx;
 
-	perf_header__set_cmdline(argc, argv);
+	perf_env__set_cmdline(&perf_env, argc, argv);
 
 	/* build usage string if it's not provided */
 	if (subcommands && !usagestr[0]) {