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