Change the TNAME behavior to "Show parent argv[0]. If that's blank, showour argv[0]. If that's blank, show [stat2]."

That way threads show their parents, parents show themselves, and
kernel threads show the [stat2] name.

1 files changed, 12 insertions, 1 deletions

diff --git a/toys/posix/ps.c b/toys/posix/ps.c
index def81c55..6a9676c0 100644
--- a/toys/posix/ps.c
+++ b/toys/posix/ps.c
@@ -443,13 +443,24 @@ static char *string_field(struct carveup *tb, struct strawberry *field)
     sl *= -1;
     // First string slot has offset 0, others are offset[-slot-2]
     if (--sl) out += tb->offset[--sl];
+    // If TNAME is blank, show ARGS instead
+    if (which==PS_ARGS && !*out)
+      out = tb->str+tb->offset[-2-typos[which = PS_ARGS].slot];
     if (which==PS_ARGS || which==PS_NAME) {
-      int i;
+      int i, j;
 
       s = out;
       for (i = 0; (which==PS_ARGS) ? i < slot[SLOT_argv0len] : out[i]; i++)
         if (out[i] == '/') s = out+i+1;
+      i = s - out;
       out = s;
+      if (which != field->which) {
+        j = slot[SLOT_argv0len]-i;
+        if (j > 259) j = 259;
+        memcpy(buf, out+i, j);
+        buf[j] = 0;
+        out = buf;
+      }
     }
     if (which>=PS_COMM && !*out) sprintf(out = buf, "[%s]", tb->str);