NAME
sig - task signal handling
SYNOPSIS
sig [[-l] | [-s sigset]] | [-g] [pid | taskp] ...
DESCRIPTION
This command displays signal-handling data of one or more tasks. Multiple
task or PID numbers may be entered; if no arguments are entered, the signal
handling data of the current context will be displayed. The default display
shows:
1. A formatted dump of the "sig" signal_struct structure referenced by
the task_struct. For each defined signal, it shows the sigaction
structure address, the signal handler, the signal sigset_t mask
(also expressed as a 64-bit hexadecimal value), and the flags.
2. Whether the task has an unblocked signal pending.
3. The contents of the "blocked" and "signal" sigset_t structures
from the task_struct/signal_struct, both of which are represented
as a 64-bit hexadecimal value.
4. For each queued signal, private and/or shared, if any, its signal
number and associated siginfo structure address.
The -l option lists the signal numbers and their name(s). The -s option
translates a 64-bit hexadecimal value representing the contents of a
sigset_t structure into the signal names whose bits are set.
pid a process PID.
taskp a hexadecimal task_struct pointer.
-g displays signal information for all threads in a task's
thread group.
-l displays the defined signal numbers and names.
-s sigset translates a 64-bit hexadecimal value representing a sigset_t
into a list of signal names associated with the bits set.
EXAMPLES
Dump the signal-handling data of PID 8970:
crash> sig 8970
PID: 8970 TASK: f67d8560 CPU: 1 COMMAND: "procsig"
SIGNAL_STRUCT: f6018680 COUNT: 1
SIG SIGACTION HANDLER MASK FLAGS
[1] f7877684 SIG_DFL 0000000000000000 0
[2] f7877698 SIG_DFL 0000000000000000 0
...
[8] f7877710 SIG_DFL 0000000000000000 0
[9] f7877724 SIG_DFL 0000000000000000 0
[10] f7877738 804867a 0000000000000000 80000000 (SA_RESETHAND)
[11] f787774c SIG_DFL 0000000000000000 0
[12] f7877760 804867f 0000000000000000 10000004 (SA_SIGINFO|SA_RESTART)
[13] f7877774 SIG_DFL 0000000000000000 0
...
[31] f78778dc SIG_DFL 0000000000000000 0
[32] f78778f0 SIG_DFL 0000000000000000 0
[33] f7877904 SIG_DFL 0000000000000000 0
[34] f7877918 804867f 0000000000000000 10000004 (SA_SIGINFO|SA_RESTART)
[35] f787792c SIG_DFL 0000000000000000 0
[36] f7877940 SIG_DFL 0000000000000000 0
...
[58] f7877af8 SIG_DFL 0000000000000000 0
[59] f7877b0c SIG_DFL 0000000000000000 0
[60] f7877b20 SIG_DFL 0000000000000000 0
[61] f7877b34 SIG_DFL 0000000000000000 0
[62] f7877b48 SIG_DFL 0000000000000000 0
[63] f7877b5c SIG_DFL 0000000000000000 0
[64] f7877b70 804867f 0000000000000000 10000004 (SA_SIGINFO|SA_RESTART)
SIGPENDING: no
BLOCKED: 8000000200000800
PRIVATE_PENDING
SIGNAL: 0000000200000800
SIGQUEUE: SIG SIGINFO
12 f51b9c84
34 f51b9594
SHARED_PENDING
SIGNAL: 8000000000000800
SIGQUEUE: SIG SIGINFO
12 f51b9188
64 f51b9d18
64 f51b9500
Dump the signal-handling data for all tasks in the thread group containing
PID 2578:
crash> sig -g 2578
PID: 2387 TASK: f617d020 CPU: 0 COMMAND: "slapd"
SIGNAL_STRUCT: f7dede00 COUNT: 6
SIG SIGACTION HANDLER MASK FLAGS
[1] c1f60c04 a258a7 0000000000000000 10000000 (SA_RESTART)
[2] c1f60c18 a258a7 0000000000000000 10000000 (SA_RESTART)
[3] c1f60c2c SIG_DFL 0000000000000000 0
[4] c1f60c40 SIG_DFL 0000000000000000 0
[5] c1f60c54 a258a7 0000000000000000 10000000 (SA_RESTART)
[6] c1f60c68 SIG_DFL 0000000000000000 0
[7] c1f60c7c SIG_DFL 0000000000000000 0
[8] c1f60c90 SIG_DFL 0000000000000000 0
[9] c1f60ca4 SIG_DFL 0000000000000000 0
[10] c1f60cb8 a25911 0000000000000000 10000000 (SA_RESTART)
...
[64] c1f610f0 SIG_DFL 0000000000000000 0
SHARED_PENDING
SIGNAL: 0000000000000000
SIGQUEUE: (empty)
PID: 2387 TASK: f617d020 CPU: 0 COMMAND: "slapd"
SIGPENDING: no
BLOCKED: 0000000000000000
PRIVATE_PENDING
SIGNAL: 0000000000000000
SIGQUEUE: (empty)
PID: 2392 TASK: f6175aa0 CPU: 0 COMMAND: "slapd"
SIGPENDING: no
BLOCKED: 0000000000000000
PRIVATE_PENDING
SIGNAL: 0000000000000000
SIGQUEUE: (empty)
PID: 2523 TASK: f7cd4aa0 CPU: 1 COMMAND: "slapd"
SIGPENDING: no
BLOCKED: 0000000000000000
PRIVATE_PENDING
SIGNAL: 0000000000000000
SIGQUEUE: (empty)
...
Translate the sigset_t mask value, cut-and-pasted from the signal handling
data from signals 1 and 10 above:
crash> sig -s 800A000000000201
SIGHUP SIGUSR1 SIGRTMAX-14 SIGRTMAX-12 SIGRTMAX
List the signal numbers and their names:
crash> sig -l
[1] SIGHUP
[2] SIGINT
[3] SIGQUIT
[4] SIGILL
[5] SIGTRAP
[6] SIGABRT/SIGIOT
[7] SIGBUS
[8] SIGFPE
[9] SIGKILL
[10] SIGUSR1
[11] SIGSEGV
[12] SIGUSR2
[13] SIGPIPE
[14] SIGALRM
[15] SIGTERM
[16] SIGSTKFLT
[17] SIGCHLD/SIGCLD
[18] SIGCONT
[19] SIGSTOP
[20] SIGTSTP
[21] SIGTTIN
[22] SIGTTOU
[23] SIGURG
[24] SIGXCPU
[25] SIGXFSZ
[26] SIGVTALRM
[27] SIGPROF
[28] SIGWINCH
[29] SIGIO/SIGPOLL
[30] SIGPWR
[31] SIGSYS
[32] SIGRTMIN
[33] SIGRTMIN+1
[34] SIGRTMIN+2
[35] SIGRTMIN+3
[36] SIGRTMIN+4
[37] SIGRTMIN+5
[38] SIGRTMIN+6
[39] SIGRTMIN+7
[40] SIGRTMIN+8
[41] SIGRTMIN+9
[42] SIGRTMIN+10
[43] SIGRTMIN+11
[44] SIGRTMIN+12
[45] SIGRTMIN+13
[46] SIGRTMIN+14
[47] SIGRTMIN+15
[48] SIGRTMIN+16
[49] SIGRTMAX-15
[50] SIGRTMAX-14
[51] SIGRTMAX-13
[52] SIGRTMAX-12
[53] SIGRTMAX-11
[54] SIGRTMAX-10
[55] SIGRTMAX-9
[56] SIGRTMAX-8
[57] SIGRTMAX-7
[58] SIGRTMAX-6
[59] SIGRTMAX-5
[60] SIGRTMAX-4
[61] SIGRTMAX-3
[62] SIGRTMAX-2
[63] SIGRTMAX-1
[64] SIGRTMAX
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