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
5#include <string.h>
6
7#define MAX_ARGS 32
8
9extern char **environ;
10static const char *argv_exec_path;
11static const char *argv0_path;
12
13const char *system_path(const char *path)
14{
15#ifdef RUNTIME_PREFIX
16 static const char *prefix;
17#else
18 static const char *prefix = PREFIX;
19#endif
20 struct strbuf d = STRBUF_INIT;
21
22 if (is_absolute_path(path))
23 return path;
24
25#ifdef RUNTIME_PREFIX
26 assert(argv0_path);
27 assert(is_absolute_path(argv0_path));
28
29 if (!prefix &&
30 !(prefix = strip_path_suffix(argv0_path, PERF_EXEC_PATH)) &&
31 !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
32 !(prefix = strip_path_suffix(argv0_path, "perf"))) {
33 prefix = PREFIX;
34 fprintf(stderr, "RUNTIME_PREFIX requested, "
35 "but prefix computation failed. "
36 "Using static fallback '%s'.\n", prefix);
37 }
38#endif
39
40 strbuf_addf(&d, "%s/%s", prefix, path);
41 path = strbuf_detach(&d, NULL);
42 return path;
43}
44
45const char *perf_extract_argv0_path(const char *argv0)
46{
47 const char *slash;
48
49 if (!argv0 || !*argv0)
50 return NULL;
51 slash = argv0 + strlen(argv0);
52
53 while (argv0 <= slash && !is_dir_sep(*slash))
54 slash--;
55
56 if (slash >= argv0) {
57 argv0_path = xstrndup(argv0, slash - argv0);
58 return slash + 1;
59 }
60
61 return argv0;
62}
63
64void perf_set_argv_exec_path(const char *exec_path)
65{
66 argv_exec_path = exec_path;
67 /*
68 * Propagate this setting to external programs.
69 */
70 setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
71}
72
73
74/* Returns the highest-priority, location to look for perf programs. */
75const char *perf_exec_path(void)
76{
77 const char *env;
78
79 if (argv_exec_path)
80 return argv_exec_path;
81
82 env = getenv(EXEC_PATH_ENVIRONMENT);
83 if (env && *env) {
84 return env;
85 }
86
87 return system_path(PERF_EXEC_PATH);
88}
89
90static void add_path(struct strbuf *out, const char *path)
91{
92 if (path && *path) {
93 if (is_absolute_path(path))
94 strbuf_addstr(out, path);
95 else
96 strbuf_addstr(out, make_nonrelative_path(path));
97
98 strbuf_addch(out, PATH_SEP);
99 }
100}
101
102void setup_path(void)
103{
104 const char *old_path = getenv("PATH");
105 struct strbuf new_path = STRBUF_INIT;
106
107 add_path(&new_path, perf_exec_path());
108 add_path(&new_path, argv0_path);
109
110 if (old_path)
111 strbuf_addstr(&new_path, old_path);
112 else
113 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
114
115 setenv("PATH", new_path.buf, 1);
116
117 strbuf_release(&new_path);
118}
119
120const char **prepare_perf_cmd(const char **argv)
121{
122 int argc;
123 const char **nargv;
124
125 for (argc = 0; argv[argc]; argc++)
126 ; /* just counting */
127 nargv = malloc(sizeof(*nargv) * (argc + 2));
128
129 nargv[0] = "perf";
130 for (argc = 0; argv[argc]; argc++)
131 nargv[argc + 1] = argv[argc];
132 nargv[argc + 1] = NULL;
133 return nargv;
134}
135
136int execv_perf_cmd(const char **argv) {
137 const char **nargv = prepare_perf_cmd(argv);
138
139 /* execvp() can only ever return if it fails */
140 execvp("perf", (char **)nargv);
141
142 free(nargv);
143 return -1;
144}
145
146
147int execl_perf_cmd(const char *cmd,...)
148{
149 int argc;
150 const char *argv[MAX_ARGS + 1];
151 const char *arg;
152 va_list param;
153
154 va_start(param, cmd);
155 argv[0] = cmd;
156 argc = 1;
157 while (argc < MAX_ARGS) {
158 arg = argv[argc++] = va_arg(param, char *);
159 if (!arg)
160 break;
161 }
162 va_end(param);
163 if (MAX_ARGS <= argc)
164 return error("too many args to run %s", cmd);
165
166 argv[argc] = NULL;
167 return execv_perf_cmd(argv);
168}