my code here is intended to display the received signal that's it but its not working when i try to send the signal
kill -SIGUSR1 pid
or
kill -10 pid
or any other signals according to my program
Code:
#include"headers.h"
static void sig_usr(int);
main()
{
if(signal(SIGUSR1,sig_usr)==SIG_ERR)
printf("cant catch signal sigusr1");
if(signal(SIGUSR2,sig_usr)==SIG_ERR)
printf("cant catch signal sigusr2");
while(1);
pause();
}
static void sig_usr(int signo)
{
if(signo==SIGUSR1)
printf("Rx sigusr1");
else if(signo==SIGUSR2)
printf("Rx sigusr2");
else printf("recieved signal is %d",signo);
return;
}
so i debugged it
debug results:
Code:
Breakpoint 1, main () at catch_signal.c:5
5 if(signal(SIGUSR1,sig_usr)==SIG_ERR)
(gdb) n
7 if(signal(SIGUSR2,sig_usr)==SIG_ERR)
(gdb) n
9 while(1);
(gdb) n
Program received signal SIGUSR1, User defined signal 1.
main () at catch_signal.c:9
9 while(1);
(gdb) n
sig_usr (signo=10) at catch_signal.c:13
13 {
(gdb) n
14 if(signo==SIGUSR1)
(gdb) n
15 printf("Rx sigusr1");
(gdb) n
Program received signal SIGTRAP, Trace/breakpoint trap.
0x08048326 in printf@plt ()
(gdb) n
Single stepping until exit from function printf@plt,
which has no line number information.
0x08048310 in ?? ()
(gdb) n
Cannot find bounds of current function
im supposed to get the result output as Rx signal usr1 but i havnt why so
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#!/bin/bash
/export/home/user/Main.shMain.sh
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/export/home/user/Child2.sh &
/export/home/user/Child3.sh &
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thanks. (2 Replies)
Task 1:
#!/bin/ksh
if
then
echo "Usage : $0 Signalnumber PID"
exit
fi
case "$1" in
1) echo "Sending SIGHUP signal"
kill -SIGHUP $2
;;
2) echo "Sending SIGINT signal"
kill -SIGINT $2
;;
3) echo "Sending SIGQUIT signal"
kill -SIGQUIT $2 (3 Replies)
Discussion started by: Ramesh M
3 Replies
LEARN ABOUT V7
kill
KILL(2) System Calls Manual KILL(2)NAME
kill - send signal to a process
SYNOPSIS
kill(pid, sig);
DESCRIPTION
Kill sends the signal sig to the process specified by the process number in r0. See signal(2) for a list of signals.
The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.
If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4).
If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler
and initialization processes, see init(8).
Processes may send signals to themselves.
SEE ALSO signal(2), kill(1)DIAGNOSTICS
Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user ID and the user is not
super-user, or if the process does not exist.
ASSEMBLER
(kill = 37.)
(process number in r0)
sys kill; sig
KILL(2)
08-19-2012
Not able to Display the Catched Signal
