git.oblomov.eu Git - git/blob - compat/procinfo.c

   1 #include "cache.h"
   2
   3 #include "strbuf.h"
   4 #include "strvec.h"
   5 #include "trace2.h"
   6
   7 static void get_ancestry_names(struct strvec *names)
   8 {
   9 #ifdef HAVE_PROCFS_LINUX
  10         /*
  11          * NEEDSWORK: We could gather the entire pstree into an array to match
  12          * functionality with compat/win32/trace2_win32_process_info.c.
  13          * To do so, we may want to examine /proc/<pid>/stat. For now, just
  14          * gather the immediate parent name which is readily accessible from
  15          * /proc/$(getppid())/comm.
  16          */
  17         struct strbuf procfs_path = STRBUF_INIT;
  18         struct strbuf name = STRBUF_INIT;
  19
  20         /* try to use procfs if it's present. */
  21         strbuf_addf(&procfs_path, "/proc/%d/comm", getppid());
  22         if (strbuf_read_file(&name, procfs_path.buf, 0)) {
  23                 strbuf_release(&procfs_path);
  24                 strbuf_trim_trailing_newline(&name);
  25                 strvec_push(names, strbuf_detach(&name, NULL));
  26         }
  27
  28         return;
  29 #endif
  30         /* NEEDSWORK: add non-procfs-linux implementations here */
  31 }
  32
  33 void trace2_collect_process_info(enum trace2_process_info_reason reason)
  34 {
  35         if (!trace2_is_enabled())
  36                 return;
  37
  38         /* someday we may want to write something extra here, but not today */
  39         if (reason == TRACE2_PROCESS_INFO_EXIT)
  40                 return;
  41
  42         if (reason == TRACE2_PROCESS_INFO_STARTUP) {
  43                 /*
  44                  * NEEDSWORK: we could do the entire ptree in an array instead,
  45                  * see compat/win32/trace2_win32_process_info.c.
  46                  */
  47                 struct strvec names = STRVEC_INIT;
  48
  49                 get_ancestry_names(&names);
  50
  51                 if (names.nr == 0) {
  52                         strvec_clear(&names);
  53                         return;
  54                 }
  55
  56                 trace2_cmd_ancestry(names.v);
  57
  58                 strvec_clear(&names);
  59         }
  60
  61         return;
  62 }