On Thu, Feb 25, 2010 at 09:57:48AM -0600, Peter Steele wrote: > >Very wild guess, check the process signal mask of the child for both methods > >of spawning. > > I'm running ntpd through Python. How do I check the process signal mask? I > did some quick searches and it seems Python does not support sigprocmask(). > > In my searches I came across this link: > > http://bugs.python.org/msg61870 > > I think you might be right that this is related to the signal mask. In my > scenario the select call is hanging indefinitely, just like discussed in this > article. >
Below is the quickly made patch to add ability to show signal disposition
to the procstat(1). I am not sure about duplicating information about
catch/ignore state of the signal for all threads (this information is
process-global), but I think this is more usable for scripts.
diff --git a/usr.bin/procstat/Makefile b/usr.bin/procstat/Makefile
index 1c187b0..251fc06 100644
--- a/usr.bin/procstat/Makefile
+++ b/usr.bin/procstat/Makefile
@@ -10,6 +10,7 @@ SRCS= procstat.c \
procstat_files.c \
procstat_kstack.c \
procstat_threads.c \
+ procstat_threads_sigs.c \
procstat_vm.c
LDADD+= -lutil
diff --git a/usr.bin/procstat/procstat.c b/usr.bin/procstat/procstat.c
index bc02682..cbd4eca 100644
--- a/usr.bin/procstat/procstat.c
+++ b/usr.bin/procstat/procstat.c
@@ -38,7 +38,7 @@
#include "procstat.h"
-static int aflag, bflag, cflag, fflag, kflag, sflag, tflag, vflag;
+static int aflag, bflag, cflag, fflag, iflag, kflag, sflag, tflag, vflag;
int hflag;
static void
@@ -46,7 +46,7 @@ usage(void)
{
fprintf(stderr, "usage: procstat [-h] [-w interval] [-b | -c | -f | "
- "-k | -s | -t | -v]\n");
+ "-i | -k | -s | -t | -v]\n");
fprintf(stderr, " [-a | pid ...]\n");
exit(EX_USAGE);
}
@@ -61,6 +61,8 @@ procstat(pid_t pid, struct kinfo_proc *kipp)
procstat_args(pid, kipp);
else if (fflag)
procstat_files(pid, kipp);
+ else if (iflag)
+ procstat_threads_sigs(pid, kipp);
else if (kflag)
procstat_kstack(pid, kipp, kflag);
else if (sflag)
@@ -109,7 +111,7 @@ main(int argc, char *argv[])
char *dummy;
interval = 0;
- while ((ch = getopt(argc, argv, "abcfkhstvw:")) != -1) {
+ while ((ch = getopt(argc, argv, "abcfikhstvw:")) != -1) {
switch (ch) {
case 'a':
aflag++;
@@ -127,6 +129,10 @@ main(int argc, char *argv[])
fflag++;
break;
+ case 'i':
+ iflag++;
+ break;
+
case 'k':
kflag++;
break;
diff --git a/usr.bin/procstat/procstat.h b/usr.bin/procstat/procstat.h
index 8bacab7..10f8fce 100644
--- a/usr.bin/procstat/procstat.h
+++ b/usr.bin/procstat/procstat.h
@@ -41,6 +41,7 @@ void procstat_cred(pid_t pid, struct kinfo_proc *kipp);
void procstat_files(pid_t pid, struct kinfo_proc *kipp);
void procstat_kstack(pid_t pid, struct kinfo_proc *kipp, int kflag);
void procstat_threads(pid_t pid, struct kinfo_proc *kipp);
+void procstat_threads_sigs(pid_t pid, struct kinfo_proc *kipp);
void procstat_vm(pid_t pid, struct kinfo_proc *kipp);
#endif /* !PROCSTAT_H */
diff --git a/usr.bin/procstat/procstat_threads_sigs.c
b/usr.bin/procstat/procstat_threads_sigs.c
new file mode 100644
index 0000000..814f0c4
--- /dev/null
+++ b/usr.bin/procstat/procstat_threads_sigs.c
@@ -0,0 +1,111 @@
+/*-
+ * Copyright (c) 2007 Robert N. M. Watson
+ * Copyright (c) 2010 Konstantin Belousov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "procstat.h"
+
+static inline void
+procstat_print_sig(const sigset_t *set, int sig)
+{
+
+ printf("%4s ", sigismember(set, sig) ? "t" : "f");
+}
+
+void
+procstat_threads_sigs(pid_t pid, struct kinfo_proc *kipp)
+{
+ struct kinfo_proc *kip;
+ int error, name[4], j;
+ char rtname[8];
+ unsigned int i;
+ size_t len;
+
+ if (!hflag)
+ printf("%5s %6s %7s %4s %4s %4s %4s\n", "PID",
+ "TID", "SIG", "PEND", "BLKC", "IGNR", "CTCH");
+
+ /*
+ * We need to re-query for thread information, so don't use *kipp.
+ */
+ name[0] = CTL_KERN;
+ name[1] = KERN_PROC;
+ name[2] = KERN_PROC_PID | KERN_PROC_INC_THREAD;
+ name[3] = pid;
+
+ len = 0;
+ error = sysctl(name, 4, NULL, &len, NULL, 0);
+ if (error < 0 && errno != ESRCH) {
+ warn("sysctl: kern.proc.pid: %d", pid);
+ return;
+ }
+ if (error < 0)
+ return;
+
+ kip = malloc(len);
+ if (kip == NULL)
+ err(-1, "malloc");
+
+ if (sysctl(name, 4, kip, &len, NULL, 0) < 0) {
+ warn("sysctl: kern.proc.pid: %d", pid);
+ free(kip);
+ return;
+ }
+
+ kinfo_proc_sort(kip, len / sizeof(*kipp));
+ for (i = 0; i < len / sizeof(*kipp); i++) {
+ kipp = &kip[i];
+ for (j = 1; j < _SIG_MAXSIG; j++) {
+ printf("%5d ", pid);
+ printf("%6d ", kipp->ki_tid);
+ if (j < sys_nsig)
+ printf("%7s ", sys_signame[j]);
+ else if (j >= SIGRTMIN && j <= SIGRTMAX) {
+ snprintf(rtname, sizeof(rtname), "rt%d", j);
+ printf("%7s ", rtname);
+ } else
+ printf("%7d ", j);
+ procstat_print_sig(&kipp->ki_siglist, j);
+ procstat_print_sig(&kipp->ki_sigmask, j);
+ procstat_print_sig(&kipp->ki_sigignore, j);
+ procstat_print_sig(&kipp->ki_sigcatch, j);
+ printf("\n");
+ }
+ }
+ free(kip);
+}
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