[linux] Maintain original output for pidfd in linux 6.9

00DIST

@@ -5605,6 +5605,9 @@ Supplement	Regenerated the 4.04 distribution to correct a non-
 
 		[linux] Do not embed kernel version in CFLAGS (#314)
 
+		[linux] Linux 6.9 changed the pidfs appearence in procfs. Try
+		to maintain original output in lsof (#317)
+
 
 Vic Abell <[email protected]>
 July 14, 2018

lib/dialects/linux/dproc.c

@@ -1338,6 +1338,18 @@ static int process_id(struct lsof_context *ctx, /* context */
                     Lf->sf |= SELPTYINFO;
                 }
 #endif /* defined(HASEPTOPTS) && defined(HASPTYEPT) */
+                else if (Lf->ntype == N_REGLR && rest && *rest && Lf->nm &&
+                         strcmp(Lf->nm, "pidfd") == 0) {
+                    // https://github.com/lsof-org/lsof/issues/317
+                    // pidfd since Linux 6.9 becomes a regular file:
+                    // /proc/PID/fd/3 -> pidfd:[PID]
+                    // rest points to "[PID]"
+                    if (sscanf(rest, "[%d]", &fi.pid) == 1) {
+                        (void)snpf(rest, sizeof(pbuf) - (rest - pbuf),
+                                   "[pidfd:%d]", fi.pid);
+                        enter_nm(ctx, rest);
+                    }
+                }
 
                 if (Lf->sf)
                     link_lfile(ctx);