3:57 p.m.
Olivier Daudel wrote:
Hi Dave,
This patch adds the shared pending signal queue to the private pending
signal queue.
With the following small variation on procsig.c, we get this result:
============================================================
crash> sig 5747
PID: 5747 TASK: f7827020 CPU: 1 COMMAND: "procsig"
SIGNAL_STRUCT: f7d71380 COUNT: 1
SIG SIGACTION HANDLER MASK FLAGS
[1] f7833384 SIG_DFL 0000000000000000 0
[...]
[64] f7833870 804867a 0000000000000000 0
SIGPENDING: no
SIGNAL: 0000000200000800
BLOCKED: 8000000200000800
SIGQUEUE: SIG SIGINFO
12 f4d74ed4
34 f4d74e40
SHARED_PENDING
SIGNAL: 8000000000000800
SIGQUEUE: SIG SIGINFO
12 f4d74060
64 f4d740f4
64 f4d74188
============================================================
Sorry -- I can't use it as us because it doesn't work with 2.4 kernels,
or at least with RHEL3 kernels. Here's a RHEL3 (2.4.21-37.ELsmp)
example:
crash> sig 1
PID: 1 TASK: dff66000 CPU: 1 COMMAND: "init"
SIGNAL_STRUCT: c27a6100 COUNT: 1
SIG SIGACTION HANDLER MASK FLAGS
[1] c2708104 8049ebc 0000000000000000 4000000 (SA_RESTORER)
[...]
[61] c27085b4 SIG_IGN 0000000000000000 14000000 (SA_RESTORER|SA_RESTART)
[62] c27085c8 SIG_IGN 0000000000000000 14000000 (SA_RESTORER|SA_RESTART)
[63] c27085dc SIG_IGN 0000000000000000 14000000 (SA_RESTORER|SA_RESTART)
SIGPENDING: no
SIGNAL: 0000000000000000
BLOCKED: 0000000000000000
SIGQUEUE: (empty)
SHARED_PENDING
SIGNAL: 0000000000000000
sig: invalid structure member offset: sigpending_list
FILE: task.c LINE: 6010 FUNCTION: dump_signal_data()
[./crash] error trace: 80cc38f => 80cc40f => 80cd378 => 8113127
8113127: OFFSET_verify+112
80cd378: dump_signal_data+3884
80cc40f: do_sig+94
80cc38f: cmd_sig+890
sig: invalid structure member offset: sigpending_list
FILE: task.c LINE: 6010 FUNCTION: dump_signal_data()
crash>
Three other things:
(1) Shouldn't your "SHARED_PENDING" line have a following
"yes" or "no" indication, as is the case with the
"SIGPENDING:" output?
(2) Thanks for remembering to add "signal_struct_shared_pending"
do dump_offset_table() -- but also don't forget to add
the new "sigpending_signal" addition you made to the
size_table structure, which is also dumped inside the
dump_offset_table() function.
(3) The SIQUEUE output is now associated with either SIGPENDING
or SHARED_PENDING, so the two SIGQUEUE outputs should be
indented so it's more obvious.
Here's what I mean:
SIGPENDING: no
SIGNAL: 0000000200000800
BLOCKED: 8000000200000800
SIGQUEUE: SIG SIGINFO -> move in 1 space
12 f4d74ed4 -> move in 1 space
34 f4d74e40 -> move in 1 space
SHARED_PENDING -> shouldn't there be yes or no here?
SIGNAL: 8000000000000800
SIGQUEUE: SIG SIGINFO -> move in 1 space
12 f4d74060 -> move in 1 space
64 f4d740f4 -> move in 1 space
64 f4d74188 -> move in 1 space
Thanks,
Dave
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <linux/unistd.h>
#ifndef GETTID
pid_t gettid(void) {return syscall(__NR_gettid);}
#endif
#ifndef TKILL
int tkill(pid_t tid, int sig) {return syscall (__NR_tkill,tid,sig); }
#endif
void sigusr2(int sig, siginfo_t *sp, void *uc)
{
}
void sigcatch()
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0 ; //SA_SIGINFO;
sa.sa_sigaction = sigusr2;
if (sigaction(SIGUSR2, &sa, NULL)==-1) {
perror("sigaction() - SIGUSR2"); exit(1);
}
if (sigaction(SIGRTMIN, &sa, NULL)==-1) {
perror("sigaction() - SIGRTMIN"); exit(1);
}
if (sigaction(SIGRTMAX, &sa, NULL)==-1) {
perror("sigaction() - SIGRTMAX"); exit(1);
}
}
void sig_block()
{
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGUSR2);
sigaddset(&set, SIGRTMIN);
sigaddset(&set, SIGRTMAX);
if (sigprocmask(SIG_SETMASK, &set,NULL) == -1) {
perror("sigprocmask()"); exit(1);
}
}
void sig_send() {
if(tkill(gettid(), SIGUSR2)==-1){
perror("tkill()"); exit(1);
}
if(tkill(gettid(), SIGRTMIN)==-1){
perror("tkill()"); exit(1);
}
if(kill(getpid(), SIGUSR2)==-1){
perror("tkill()"); exit(1);
}
if(kill(getpid(), SIGRTMAX)==-1){
perror("tkill()"); exit(1);
}
if(kill(getpid(), SIGRTMAX)==-1){
perror("tkill()"); exit(1);
}
}
main(int argc)
{
sigcatch();
sig_block();
sig_send();
pause();
}
------------------------------------------------------------------------------------------------------------------------
Name: sig2.patch
sig2.patch Type: unspecified type (application/octet-stream)
Encoding: quoted-printable
------------------------------------------------------------------------------------------------------------------------
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