Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include "cache.h"
2#include "exec_cmd.h"
3#include "quote.h"
4#define MAX_ARGS 32
5
6extern char **environ;
7static const char *argv_exec_path;
8static const char *argv0_path;
9
10const char *system_path(const char *path)
11{
12#ifdef RUNTIME_PREFIX
13 static const char *prefix;
14#else
15 static const char *prefix = PREFIX;
16#endif
17 struct strbuf d = STRBUF_INIT;
18
19 if (is_absolute_path(path))
20 return path;
21
22#ifdef RUNTIME_PREFIX
23 assert(argv0_path);
24 assert(is_absolute_path(argv0_path));
25
26 if (!prefix &&
27 !(prefix = strip_path_suffix(argv0_path, PERF_EXEC_PATH)) &&
28 !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
29 !(prefix = strip_path_suffix(argv0_path, "perf"))) {
30 prefix = PREFIX;
31 fprintf(stderr, "RUNTIME_PREFIX requested, "
32 "but prefix computation failed. "
33 "Using static fallback '%s'.\n", prefix);
34 }
35#endif
36
37 strbuf_addf(&d, "%s/%s", prefix, path);
38 path = strbuf_detach(&d, NULL);
39 return path;
40}
41
42const char *perf_extract_argv0_path(const char *argv0)
43{
44 const char *slash;
45
46 if (!argv0 || !*argv0)
47 return NULL;
48 slash = argv0 + strlen(argv0);
49
50 while (argv0 <= slash && !is_dir_sep(*slash))
51 slash--;
52
53 if (slash >= argv0) {
54 argv0_path = strndup(argv0, slash - argv0);
55 return slash + 1;
56 }
57
58 return argv0;
59}
60
61void perf_set_argv_exec_path(const char *exec_path)
62{
63 argv_exec_path = exec_path;
64 /*
65 * Propagate this setting to external programs.
66 */
67 setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
68}
69
70
71/* Returns the highest-priority, location to look for perf programs. */
72const char *perf_exec_path(void)
73{
74 const char *env;
75
76 if (argv_exec_path)
77 return argv_exec_path;
78
79 env = getenv(EXEC_PATH_ENVIRONMENT);
80 if (env && *env) {
81 return env;
82 }
83
84 return system_path(PERF_EXEC_PATH);
85}
86
87static void add_path(struct strbuf *out, const char *path)
88{
89 if (path && *path) {
90 if (is_absolute_path(path))
91 strbuf_addstr(out, path);
92 else
93 strbuf_addstr(out, make_nonrelative_path(path));
94
95 strbuf_addch(out, PATH_SEP);
96 }
97}
98
99void setup_path(void)
100{
101 const char *old_path = getenv("PATH");
102 struct strbuf new_path = STRBUF_INIT;
103
104 add_path(&new_path, perf_exec_path());
105 add_path(&new_path, argv0_path);
106
107 if (old_path)
108 strbuf_addstr(&new_path, old_path);
109 else
110 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
111
112 setenv("PATH", new_path.buf, 1);
113
114 strbuf_release(&new_path);
115}
116
117const char **prepare_perf_cmd(const char **argv)
118{
119 int argc;
120 const char **nargv;
121
122 for (argc = 0; argv[argc]; argc++)
123 ; /* just counting */
124 nargv = malloc(sizeof(*nargv) * (argc + 2));
125
126 nargv[0] = "perf";
127 for (argc = 0; argv[argc]; argc++)
128 nargv[argc + 1] = argv[argc];
129 nargv[argc + 1] = NULL;
130 return nargv;
131}
132
133int execv_perf_cmd(const char **argv) {
134 const char **nargv = prepare_perf_cmd(argv);
135
136 /* execvp() can only ever return if it fails */
137 execvp("perf", (char **)nargv);
138
139 free(nargv);
140 return -1;
141}
142
143
144int execl_perf_cmd(const char *cmd,...)
145{
146 int argc;
147 const char *argv[MAX_ARGS + 1];
148 const char *arg;
149 va_list param;
150
151 va_start(param, cmd);
152 argv[0] = cmd;
153 argc = 1;
154 while (argc < MAX_ARGS) {
155 arg = argv[argc++] = va_arg(param, char *);
156 if (!arg)
157 break;
158 }
159 va_end(param);
160 if (MAX_ARGS <= argc)
161 return error("too many args to run %s", cmd);
162
163 argv[argc] = NULL;
164 return execv_perf_cmd(argv);
165}