Date: Tue, 4 Mar 2008 14:53:03 +0200 From: Jaakko Heinonen <jh@saunalahti.fi> To: sos@FreeBSD.org, freebsd-current@FreeBSD.org Subject: [patch] burncd(8) signal and error handling improvements Message-ID: <20080304125303.GA2619@ws64.jh.dy.fi>
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[-- Attachment #1 --]
Hi,
burncd(8) doesn't handle signals and interrupting burncd during
operation for example with SIGINT (^C) may leave the drive spinning and
locked. This may happen also if you try to write a too large image to a
disc and burncd(8) exits with an I/O error.
Attached patch implements signal handling for burncd(8). It does
CDRIOCFLUSH ioctl to attempt leave burner sane state when burning is
interrupted with SIGHUP, SIGINT, SIGTERM or in case an I/O error occurs
during write. Blanking will still continue after interrupt but it seems
to finish correctly even after burncd(8) has quit.
Relevant PR is bin/48730 which has an older version of the patch.
--
Jaakko
[-- Attachment #2 --]
Index: burncd.c
===================================================================
RCS file: /home/ncvs/src/usr.sbin/burncd/burncd.c,v
retrieving revision 1.45
diff -p -u -r1.45 burncd.c
--- burncd.c 13 May 2005 20:06:44 -0000 1.45
+++ burncd.c 3 Mar 2008 10:16:48 -0000
@@ -36,6 +36,7 @@
#include <err.h>
#include <sysexits.h>
#include <fcntl.h>
+#include <signal.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
@@ -67,6 +68,8 @@ int write_file(int fd, struct track_info
int roundup_blocks(struct track_info *);
void cue_ent(struct cdr_cue_entry *, int, int, int, int, int, int, int);
void cleanup(int);
+void cleanup_flush(void);
+void cleanup_signal(int);
void usage(void);
int
@@ -157,6 +160,9 @@ main(int argc, char **argv)
global_fd_for_cleanup = fd;
err_set_exit(cleanup);
+ signal(SIGHUP, cleanup_signal);
+ signal(SIGINT, cleanup_signal);
+ signal(SIGTERM, cleanup_signal);
for (arg = 0; arg < argc; arg++) {
if (!strcasecmp(argv[arg], "fixate")) {
@@ -319,6 +325,10 @@ main(int argc, char **argv)
if (eject)
if (ioctl(fd, CDIOCEJECT) < 0)
err(EX_IOERR, "ioctl(CDIOCEJECT)");
+
+ signal(SIGHUP, SIG_DFL);
+ signal(SIGINT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
close(fd);
exit(EX_OK);
}
@@ -469,8 +479,10 @@ do_DAO(int fd, int test_write, int multi
err(EX_IOERR, "ioctl(CDRIOCSENDCUE)");
for (i = 0; i < notracks; i++) {
- if (write_file(fd, &tracks[i]))
+ if (write_file(fd, &tracks[i])) {
+ cleanup_flush();
err(EX_IOERR, "write_file");
+ }
}
ioctl(fd, CDRIOCFLUSH);
@@ -499,8 +511,10 @@ do_TAO(int fd, int test_write, int preem
if (!quiet)
fprintf(stderr, "next writeable LBA %d\n",
tracks[i].addr);
- if (write_file(fd, &tracks[i]))
+ if (write_file(fd, &tracks[i])) {
+ cleanup_flush();
err(EX_IOERR, "write_file");
+ }
if (ioctl(fd, CDRIOCFLUSH) < 0)
err(EX_IOERR, "ioctl(CDRIOCFLUSH)");
}
@@ -630,9 +644,11 @@ write_file(int fd, struct track_info *tr
track_info->block_size;
}
if ((res = write(fd, buf, count)) != count) {
- if (res == -1)
- fprintf(stderr, "\n%s\n", strerror(errno));
- else
+ if (res == -1) {
+ fprintf(stderr, "\n");
+ close(track_info->file);
+ return errno;
+ } else
fprintf(stderr, "\nonly wrote %d of %jd"
" bytes\n", res, (intmax_t)count);
break;
@@ -690,6 +706,21 @@ cleanup(int dummy __unused)
if (ioctl(global_fd_for_cleanup, CDRIOCSETBLOCKSIZE,
&saved_block_size) < 0)
err(EX_IOERR, "ioctl(CDRIOCSETBLOCKSIZE)");
+}
+
+void
+cleanup_flush(void)
+{
+ if (ioctl(global_fd_for_cleanup, CDRIOCFLUSH) < 0)
+ err(EX_IOERR, "ioctl(CDRIOCFLUSH)");
+}
+
+void
+cleanup_signal(int sig __unused)
+{
+ cleanup_flush();
+ fprintf(stderr, "\n");
+ errx(EXIT_FAILURE, "Aborted");
}
void
help
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