[src/trunk]: src/usr.bin/make make(1): clean up Job_Touch

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

details:   https://anonhg.NetBSD.org/src/rev/98eefa6da453
branches:  trunk
changeset: 946029:98eefa6da453
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Nov 14 14:16:01 2020 +0000

description:
make(1): clean up Job_Touch

Several more outdated comments were removed.  To compensate for that,
several new comments mark places where errors are not properly
propagated.

diffstat:

 usr.bin/make/compat.c |    7 +-
 usr.bin/make/job.c    |  105 +++++++++++++++++++++----------------------------
 2 files changed, 49 insertions(+), 63 deletions(-)

diffs (189 lines):

diff -r 6e23a1da88d9 -r 98eefa6da453 usr.bin/make/compat.c
--- a/usr.bin/make/compat.c     Sat Nov 14 14:13:09 2020 +0000
+++ b/usr.bin/make/compat.c     Sat Nov 14 14:16:01 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: compat.c,v 1.181 2020/11/08 08:33:07 rillig Exp $      */
+/*     $NetBSD: compat.c,v 1.182 2020/11/14 14:16:01 rillig Exp $      */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -96,7 +96,7 @@
 #include "pathnames.h"
 
 /*     "@(#)compat.c   8.2 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: compat.c,v 1.181 2020/11/08 08:33:07 rillig Exp $");
+MAKE_RCSID("$NetBSD: compat.c,v 1.182 2020/11/14 14:16:01 rillig Exp $");
 
 static GNode *curTarg = NULL;
 static pid_t compatChild;
@@ -561,8 +561,7 @@
        if (gn->made != ERROR) {
            /*
             * If the node was made successfully, mark it so, update
-            * its modification time and timestamp all its parents. Note
-            * that for .ZEROTIME targets, the timestamping isn't done.
+            * its modification time and timestamp all its parents.
             * This is to keep its state from affecting that of its parent.
             */
            gn->made = MADE;
diff -r 6e23a1da88d9 -r 98eefa6da453 usr.bin/make/job.c
--- a/usr.bin/make/job.c        Sat Nov 14 14:13:09 2020 +0000
+++ b/usr.bin/make/job.c        Sat Nov 14 14:16:01 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: job.c,v 1.320 2020/11/14 13:45:34 rillig Exp $ */
+/*     $NetBSD: job.c,v 1.321 2020/11/14 14:16:01 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -143,7 +143,7 @@
 #include "trace.h"
 
 /*     "@(#)job.c      8.2 (Berkeley) 3/19/94" */
-MAKE_RCSID("$NetBSD: job.c,v 1.320 2020/11/14 13:45:34 rillig Exp $");
+MAKE_RCSID("$NetBSD: job.c,v 1.321 2020/11/14 14:16:01 rillig Exp $");
 
 /* A shell defines how the commands are run.  All commands for a target are
  * written into a single file, which is then given to the shell to execute
@@ -1051,11 +1051,9 @@
 
 #ifdef USE_META
     if (useMeta) {
-       int x;
-
-       if ((x = meta_job_finish(job)) != 0 && status == 0) {
-           status = x;
-       }
+       int meta_status = meta_job_finish(job);
+       if (meta_status != 0 && status == 0)
+           status = meta_status;
     }
 #endif
 
@@ -1086,27 +1084,44 @@
        job->status = JOB_ST_FREE;
     }
 
-    /*
-     * Set aborting if any error.
-     */
-    if (errors && !opts.keepgoing && (aborting != ABORT_INTERRUPT)) {
-       /*
-        * If we found any errors in this batch of children and the -k flag
-        * wasn't given, we set the aborting flag so no more jobs get
-        * started.
-        */
-       aborting = ABORT_ERROR;
-    }
+    if (errors > 0 && !opts.keepgoing && aborting != ABORT_INTERRUPT)
+       aborting = ABORT_ERROR; /* Prevent more jobs from getting started. */
 
     if (return_job_token)
        Job_TokenReturn();
 
-    if (aborting == ABORT_ERROR && jobTokensRunning == 0) {
-       /*
-        * If we are aborting and the job table is now empty, we finish.
-        */
+    if (aborting == ABORT_ERROR && jobTokensRunning == 0)
        Finish(errors);
+}
+
+static void
+TouchRegular(GNode *gn)
+{
+    const char *file = GNode_Path(gn);
+    struct utimbuf times = { now, now };
+    int fd;
+    char c;
+
+    if (utime(file, &times) >= 0)
+       return;
+
+    fd = open(file, O_RDWR | O_CREAT, 0666);
+    if (fd < 0) {
+       (void)fprintf(stdout, "*** couldn't touch %s: %s",
+                     file, strerror(errno));
+       (void)fflush(stdout);
+       return;                /* XXX: What about propagating the error? */
     }
+
+    /* Last resort: update the file's time stamps in the traditional way.
+     * XXX: This doesn't work for empty files, which are sometimes used
+     * as marker files. */
+    if (read(fd, &c, 1) == 1) {
+       (void)lseek(fd, 0, SEEK_SET);
+       while (write(fd, &c, 1) == -1 && errno == EAGAIN)
+           continue;
+    }
+    (void)close(fd);           /* XXX: What about propagating the error? */
 }
 
 /* Touch the given target. Called by JobStart when the -t flag was given.
@@ -1116,15 +1131,9 @@
 void
 Job_Touch(GNode *gn, Boolean silent)
 {
-    int streamID;              /* ID of stream opened to do the touch */
-    struct utimbuf times;      /* Times for utime() call */
-
     if (gn->type & (OP_JOIN|OP_USE|OP_USEBEFORE|OP_EXEC|OP_OPTIONAL|
        OP_SPECIAL|OP_PHONY)) {
-       /*
-        * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets
-        * and, as such, shouldn't really be created.
-        */
+       /* These are "virtual" targets and should not really be created. */
        return;
     }
 
@@ -1133,42 +1142,20 @@
        (void)fflush(stdout);
     }
 
-    if (!GNode_ShouldExecute(gn)) {
+    if (!GNode_ShouldExecute(gn))
        return;
-    }
 
     if (gn->type & OP_ARCHV) {
        Arch_Touch(gn);
-    } else if (gn->type & OP_LIB) {
-       Arch_TouchLib(gn);
-    } else {
-       const char *file = GNode_Path(gn);
-
-       times.actime = times.modtime = now;
-       if (utime(file, &times) < 0) {
-           streamID = open(file, O_RDWR | O_CREAT, 0666);
-
-           if (streamID >= 0) {
-               char    c;
+       return;
+    }
 
-               /*
-                * Read and write a byte to the file to change the
-                * modification time, then close the file.
-                */
-               if (read(streamID, &c, 1) == 1) {
-                   (void)lseek(streamID, 0, SEEK_SET);
-                   while (write(streamID, &c, 1) == -1 && errno == EAGAIN)
-                       continue;
-               }
+    if (gn->type & OP_LIB) {
+       Arch_TouchLib(gn);
+       return;
+    }
 
-               (void)close(streamID);
-           } else {
-               (void)fprintf(stdout, "*** couldn't touch %s: %s",
-                              file, strerror(errno));
-               (void)fflush(stdout);
-           }
-       }
-    }
+    TouchRegular(gn);
 }
 
 /* Make sure the given node has all the commands it needs.