aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/util/exec_cmd.c
blob: 7adf4ad15d8fcfd4c90d1efbe72f2594e47a3575 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
#include "cache.h"
#include "exec_cmd.h"
#include "quote.h"

#include <string.h>

#define MAX_ARGS	32

static const char *argv_exec_path;
static const char *argv0_path;

const char *system_path(const char *path)
{
	static const char *prefix = PREFIX;
	struct strbuf d = STRBUF_INIT;

	if (is_absolute_path(path))
		return path;

	strbuf_addf(&d, "%s/%s", prefix, path);
	path = strbuf_detach(&d, NULL);
	return path;
}

const char *perf_extract_argv0_path(const char *argv0)
{
	const char *slash;

	if (!argv0 || !*argv0)
		return NULL;
	slash = argv0 + strlen(argv0);

	while (argv0 <= slash && !is_dir_sep(*slash))
		slash--;

	if (slash >= argv0) {
		argv0_path = strndup(argv0, slash - argv0);
		return argv0_path ? slash + 1 : NULL;
	}

	return argv0;
}

void perf_set_argv_exec_path(const char *exec_path)
{
	argv_exec_path = exec_path;
	/*
	 * Propagate this setting to external programs.
	 */
	setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
}


/* Returns the highest-priority, location to look for perf programs. */
const char *perf_exec_path(void)
{
	const char *env;

	if (argv_exec_path)
		return argv_exec_path;

	env = getenv(EXEC_PATH_ENVIRONMENT);
	if (env && *env) {
		return env;
	}

	return system_path(PERF_EXEC_PATH);
}

static void add_path(struct strbuf *out, const char *path)
{
	if (path && *path) {
		if (is_absolute_path(path))
			strbuf_addstr(out, path);
		else
			strbuf_addstr(out, make_nonrelative_path(path));

		strbuf_addch(out, PATH_SEP);
	}
}

void setup_path(void)
{
	const char *old_path = getenv("PATH");
	struct strbuf new_path = STRBUF_INIT;

	add_path(&new_path, perf_exec_path());
	add_path(&new_path, argv0_path);

	if (old_path)
		strbuf_addstr(&new_path, old_path);
	else
		strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");

	setenv("PATH", new_path.buf, 1);

	strbuf_release(&new_path);
}

static const char **prepare_perf_cmd(const char **argv)
{
	int argc;
	const char **nargv;

	for (argc = 0; argv[argc]; argc++)
		; /* just counting */
	nargv = malloc(sizeof(*nargv) * (argc + 2));

	nargv[0] = "perf";
	for (argc = 0; argv[argc]; argc++)
		nargv[argc + 1] = argv[argc];
	nargv[argc + 1] = NULL;
	return nargv;
}

int execv_perf_cmd(const char **argv) {
	const char **nargv = prepare_perf_cmd(argv);

	/* execvp() can only ever return if it fails */
	execvp("perf", (char **)nargv);

	free(nargv);
	return -1;
}


int execl_perf_cmd(const char *cmd,...)
{
	int argc;
	const char *argv[MAX_ARGS + 1];
	const char *arg;
	va_list param;

	va_start(param, cmd);
	argv[0] = cmd;
	argc = 1;
	while (argc < MAX_ARGS) {
		arg = argv[argc++] = va_arg(param, char *);
		if (!arg)
			break;
	}
	va_end(param);
	if (MAX_ARGS <= argc)
		return error("too many args to run %s", cmd);

	argv[argc] = NULL;
	return execv_perf_cmd(argv);
}