tools/perf/ui/browsers/scripts.c

   1 #include <elf.h>
   2 #include <inttypes.h>
   3 #include <sys/ttydefaults.h>
   4 #include <string.h>
   5 #include "../../util/sort.h"
   6 #include "../../util/util.h"
   7 #include "../../util/hist.h"
   8 #include "../../util/debug.h"
   9 #include "../../util/symbol.h"
  10 #include "../browser.h"
  11 #include "../helpline.h"
  12 #include "../libslang.h"
  13
  14 /* 2048 lines should be enough for a script output */
  15 #define MAX_LINES               2048
  16
  17 /* 160 bytes for one output line */
  18 #define AVERAGE_LINE_LEN        160
  19
  20 struct script_line {
  21         struct list_head node;
  22         char line[AVERAGE_LINE_LEN];
  23 };
  24
  25 struct perf_script_browser {
  26         struct ui_browser b;
  27         struct list_head entries;
  28         const char *script_name;
  29         int nr_lines;
  30 };
  31
  32 #define SCRIPT_NAMELEN  128
  33 #define SCRIPT_MAX_NO   64
  34 /*
  35  * Usually the full path for a script is:
  36  *      /home/username/libexec/perf-core/scripts/python/xxx.py
  37  *      /home/username/libexec/perf-core/scripts/perl/xxx.pl
  38  * So 256 should be long enough to contain the full path.
  39  */
  40 #define SCRIPT_FULLPATH_LEN     256
  41
  42 /*
  43  * When success, will copy the full path of the selected script
  44  * into  the buffer pointed by script_name, and return 0.
  45  * Return -1 on failure.
  46  */
  47 static int list_scripts(char *script_name)
  48 {
  49         char *buf, *names[SCRIPT_MAX_NO], *paths[SCRIPT_MAX_NO];
  50         int i, num, choice, ret = -1;
  51
  52         /* Preset the script name to SCRIPT_NAMELEN */
  53         buf = malloc(SCRIPT_MAX_NO * (SCRIPT_NAMELEN + SCRIPT_FULLPATH_LEN));
  54         if (!buf)
  55                 return ret;
  56
  57         for (i = 0; i < SCRIPT_MAX_NO; i++) {
  58                 names[i] = buf + i * (SCRIPT_NAMELEN + SCRIPT_FULLPATH_LEN);
  59                 paths[i] = names[i] + SCRIPT_NAMELEN;
  60         }
  61
  62         num = find_scripts(names, paths);
  63         if (num > 0) {
  64                 choice = ui__popup_menu(num, names);
  65                 if (choice < num && choice >= 0) {
  66                         strcpy(script_name, paths[choice]);
  67                         ret = 0;
  68                 }
  69         }
  70
  71         free(buf);
  72         return ret;
  73 }
  74
  75 static void script_browser__write(struct ui_browser *browser,
  76                                    void *entry, int row)
  77 {
  78         struct script_line *sline = list_entry(entry, struct script_line, node);
  79         bool current_entry = ui_browser__is_current_entry(browser, row);
  80
  81         ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
  82                                                        HE_COLORSET_NORMAL);
  83
  84         slsmg_write_nstring(sline->line, browser->width);
  85 }
  86
  87 static int script_browser__run(struct perf_script_browser *browser)
  88 {
  89         int key;
  90
  91         if (ui_browser__show(&browser->b, browser->script_name,
  92                              "Press <- or ESC to exit") < 0)
  93                 return -1;
  94
  95         while (1) {
  96                 key = ui_browser__run(&browser->b, 0);
  97
  98                 /* We can add some special key handling here if needed */
  99                 break;
 100         }
 101
 102         ui_browser__hide(&browser->b);
 103         return key;
 104 }
 105
 106
 107 int script_browse(const char *script_opt)
 108 {
 109         char cmd[SCRIPT_FULLPATH_LEN*2], script_name[SCRIPT_FULLPATH_LEN];
 110         char *line = NULL;
 111         size_t len = 0;
 112         ssize_t retlen;
 113         int ret = -1, nr_entries = 0;
 114         FILE *fp;
 115         void *buf;
 116         struct script_line *sline;
 117
 118         struct perf_script_browser script = {
 119                 .b = {
 120                         .refresh    = ui_browser__list_head_refresh,
 121                         .seek       = ui_browser__list_head_seek,
 122                         .write      = script_browser__write,
 123                 },
 124                 .script_name = script_name,
 125         };
 126
 127         INIT_LIST_HEAD(&script.entries);
 128
 129         /* Save each line of the output in one struct script_line object. */
 130         buf = zalloc((sizeof(*sline)) * MAX_LINES);
 131         if (!buf)
 132                 return -1;
 133         sline = buf;
 134
 135         memset(script_name, 0, SCRIPT_FULLPATH_LEN);
 136         if (list_scripts(script_name))
 137                 goto exit;
 138
 139         sprintf(cmd, "perf script -s %s ", script_name);
 140
 141         if (script_opt)
 142                 strcat(cmd, script_opt);
 143
 144         if (input_name) {
 145                 strcat(cmd, " -i ");
 146                 strcat(cmd, input_name);
 147         }
 148
 149         strcat(cmd, " 2>&1");
 150
 151         fp = popen(cmd, "r");
 152         if (!fp)
 153                 goto exit;
 154
 155         while ((retlen = getline(&line, &len, fp)) != -1) {
 156                 strncpy(sline->line, line, AVERAGE_LINE_LEN);
 157
 158                 /* If one output line is very large, just cut it short */
 159                 if (retlen >= AVERAGE_LINE_LEN) {
 160                         sline->line[AVERAGE_LINE_LEN - 1] = '\0';
 161                         sline->line[AVERAGE_LINE_LEN - 2] = '\n';
 162                 }
 163                 list_add_tail(&sline->node, &script.entries);
 164
 165                 if (script.b.width < retlen)
 166                         script.b.width = retlen;
 167
 168                 if (nr_entries++ >= MAX_LINES - 1)
 169                         break;
 170                 sline++;
 171         }
 172
 173         if (script.b.width > AVERAGE_LINE_LEN)
 174                 script.b.width = AVERAGE_LINE_LEN;
 175
 176         free(line);
 177         pclose(fp);
 178
 179         script.nr_lines = nr_entries;
 180         script.b.nr_entries = nr_entries;
 181         script.b.entries = &script.entries;
 182
 183         ret = script_browser__run(&script);
 184 exit:
 185         free(buf);
 186         return ret;
 187 }