[src/trunk]: src/bin/sh NFC: DEBUG (compile time) mode only change:

[kre <kre%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a4842b0745f0
branches:  trunk
changeset: 365403:a4842b0745f0
user:      kre <kre%NetBSD.org@localhost>
date:      Mon Aug 13 22:13:02 2018 +0000

description:
NFC:  DEBUG (compile time) mode only change:
        Add some extra redirection (fd manipulation) tracing.
While here, some white space fixes, and very minor KNF.

diffstat:

 bin/sh/redir.c |  40 +++++++++++++++++++++++++++++-----------
 1 files changed, 29 insertions(+), 11 deletions(-)

diffs (158 lines):

diff -r be996877e676 -r a4842b0745f0 bin/sh/redir.c
--- a/bin/sh/redir.c    Mon Aug 13 22:00:45 2018 +0000
+++ b/bin/sh/redir.c    Mon Aug 13 22:13:02 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: redir.c,v 1.59 2017/11/15 09:21:48 kre Exp $   */
+/*     $NetBSD: redir.c,v 1.60 2018/08/13 22:13:02 kre Exp $   */
 
 /*-
  * Copyright (c) 1991, 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)redir.c    8.2 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: redir.c,v 1.59 2017/11/15 09:21:48 kre Exp $");
+__RCSID("$NetBSD: redir.c,v 1.60 2018/08/13 22:13:02 kre Exp $");
 #endif
 #endif /* not lint */
 
@@ -148,11 +148,17 @@
                rn = rl->next;
                if (rl->orig == 0)
                        fd0_redirected--;
+               VTRACE(DBG_REDIR, ("popredir %d%s: %s",
+                   rl->orig, rl->orig==0 ? " (STDIN)" : "",
+                   reset ? "" : "no reset\n"));
                if (reset) {
-                       if (rl->into < 0)
+                       if (rl->into < 0) {
+                               VTRACE(DBG_REDIR, ("closed\n"));
                                close(rl->orig);
-                       else
+                       } else {
+                               VTRACE(DBG_REDIR, ("from %d\n", rl->into));
                                movefd(rl->into, rl->orig);
+                       }
                }
                ckfree(rl);
        }
@@ -162,6 +168,7 @@
 STATIC void
 fd_rename(struct redirtab *rt, int from, int to)
 {
+       /* XXX someday keep a short list (8..10) of freed renamelists XXX */
        struct renamelist *rl = ckmalloc(sizeof(struct renamelist));
 
        rl->next = rt->renamed;
@@ -188,11 +195,13 @@
        int fd;
        char memory[10];        /* file descriptors to write to memory */
 
+       CTRACE(DBG_REDIR, ("redirect(F=0x%x):%s\n", flags, redir?"":" NONE"));
        for (i = 10 ; --i >= 0 ; )
                memory[i] = 0;
        memory[1] = flags & REDIR_BACKQ;
        if (flags & REDIR_PUSH) {
-               /* We don't have to worry about REDIR_VFORK here, as
+               /*
+                * We don't have to worry about REDIR_VFORK here, as
                 * flags & REDIR_PUSH is never true if REDIR_VFORK is set.
                 */
                sv = ckmalloc(sizeof (struct redirtab));
@@ -202,6 +211,7 @@
        }
        for (n = redir ; n ; n = n->nfile.next) {
                fd = n->nfile.fd;
+               VTRACE(DBG_REDIR, ("redir %d (max=%d) ", fd, max_user_fd));
                if (fd > max_user_fd)
                        max_user_fd = fd;
                renumber_sh_fd(sh_fd(fd));
@@ -211,6 +221,7 @@
                        /* make sure it stays open */
                        if (fcntl(fd, F_SETFD, 0) < 0)
                                error("fd %d: %s", fd, strerror(errno));
+                       VTRACE(DBG_REDIR, ("!cloexec\n"));
                        continue;
                }
 
@@ -240,8 +251,10 @@
                        if (i >= 0)
                                (void)fcntl(i, F_SETFD, FD_CLOEXEC);
                        fd_rename(sv, fd, i);
+                       VTRACE(DBG_REDIR, ("saved as %d ", i));
                        INTON;
                }
+               VTRACE(DBG_REDIR, ("%s\n", fd == 0 ? "STDIN" : ""));
                if (fd == 0)
                        fd0_redirected++;
                openredirect(n, memory, flags);
@@ -307,6 +320,8 @@
                                errno = EEXIST;
                                goto ecreate;
                        }
+                       VTRACE(DBG_REDIR, ("openredirect(>| '%s') -> %d",
+                           fname, f));
                        break;
                }
                /* FALLTHROUGH */
@@ -343,8 +358,8 @@
                return;
        case NHERE:
        case NXHERE:
+               VTRACE(DBG_REDIR, ("openredirect: %d<<...", fd));
                f = openhere(redir);
-               VTRACE(DBG_REDIR, ("openredirect: %d<<...", fd));
                break;
        default:
                abort();
@@ -367,10 +382,10 @@
 
        INTON;
        return;
-ecreate:
+ ecreate:
        exerrno = 1;
        error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
-eopen:
+ eopen:
        exerrno = 1;
        error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
 }
@@ -397,6 +412,7 @@
                        goto out;
                }
        }
+       VTRACE(DBG_REDIR, (" forking [%d,%d]\n", pip[0], pip[1]));
        if (forkshell(NULL, NULL, FORK_NOJOB) == 0) {
                close(pip[0]);
                signal(SIGINT, SIG_IGN);
@@ -412,8 +428,10 @@
                        expandhere(redir->nhere.doc, pip[1]);
                _exit(0);
        }
-out:
+       VTRACE(DBG_REDIR, ("openhere (closing %d)", pip[1]));
+ out:
        close(pip[1]);
+       VTRACE(DBG_REDIR, (" (pipe fd=%d)", pip[0]));
        return pip[0];
 }
 
@@ -505,7 +523,7 @@
  * rename fd from to be fd to (closing from).
  * close-on-exec is never set on 'to' (unless
  * from==to and it was set on from) - ie: a no-op
- * returns to (or errors() if an error occurs).  
+ * returns to (or errors() if an error occurs).
  *
  * This is mostly used for rearranging the
  * results from pipe().
@@ -796,7 +814,7 @@
                default:
                        error("Missing +/- indicator before flag %s", s-1);
                }
-                       
+
                len = strlen(s);
                for (fn = nv; fn->name; fn++)
                        if (len >= fn->minch && strncmp(s,fn->name,len) == 0) {