[src/trunk]: src/sbin/scan_ffs add SIGINFO support. now you can know how far...

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

details:   https://anonhg.NetBSD.org/src/rev/5ebcca281930
branches:  trunk
changeset: 359727:5ebcca281930
user:      mrg <mrg%NetBSD.org@localhost>
date:      Wed Jan 19 01:40:05 2022 +0000

description:
add SIGINFO support.  now you can know how far along the scan is.

diffstat:

 sbin/scan_ffs/scan_ffs.c |  25 +++++++++++++++++++++++--
 1 files changed, 23 insertions(+), 2 deletions(-)

diffs (68 lines):

diff -r 37a26b6e2da0 -r 5ebcca281930 sbin/scan_ffs/scan_ffs.c
--- a/sbin/scan_ffs/scan_ffs.c  Tue Jan 18 20:43:37 2022 +0000
+++ b/sbin/scan_ffs/scan_ffs.c  Wed Jan 19 01:40:05 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: scan_ffs.c,v 1.32 2015/10/15 06:25:23 dholland Exp $ */
+/* $NetBSD: scan_ffs.c,v 1.33 2022/01/19 01:40:05 mrg Exp $ */
 
 /*
  * Copyright (c) 2005-2007 Juan Romero Pardines
@@ -33,7 +33,7 @@
  
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: scan_ffs.c,v 1.32 2015/10/15 06:25:23 dholland Exp $");
+__RCSID("$NetBSD: scan_ffs.c,v 1.33 2022/01/19 01:40:05 mrg Exp $");
 #endif /* not lint */
 
 #include <sys/types.h>
@@ -80,6 +80,8 @@
 static char    device[MAXPATHLEN];
 static const char *fstypes[] = { "NONE", "FFSv1", "FFSv2" };
 
+static sig_atomic_t print_info = 0;
+
 #define FSTYPE_NONE    0
 #define FSTYPE_FFSV1   1
 #define FSTYPE_FFSV2   2
@@ -109,6 +111,13 @@
 static void    usage(void) __dead;
 static int     scan_disk(int, daddr_t, daddr_t, int);
 
+static void
+got_siginfo(int signo)
+{
+
+       print_info = 1;
+}
+
 static int
 ffs_checkver(struct sblockinfo *sbi)
 {
@@ -389,7 +398,17 @@
                (void)printf(
                    "#        size    offset fstype [fsize bsize cpg/sgs]\n");
 
+       const daddr_t total = end - beg;
        for (blk = beg; blk <= end; blk += SBPASS) {
+               if (print_info) {
+                       const daddr_t done = blk - beg;
+                       const int pcent = (int)((100.0 * done) / total);
+
+                       fprintf(stderr, "%s: done %llu of %llu blocks (%d%%)\n", 
+                               getprogname(), (unsigned long long)done,
+                               (unsigned long long)total, pcent);
+                       print_info = 0;
+               }
                if (pread(fd, buf, sizeof(buf), blk * 512) == -1) {
                        if (fflag && fd >= 0)
                                (void)close(fd);
@@ -479,6 +498,8 @@
        argc -= optind;
        argv += optind;
 
+       signal(SIGINFO, got_siginfo);
+
        if (fflag) {
                struct stat stp;