Hi everybody,
i'm using a signal handler for the SIGCHLD signal.
The actual signal handler code is:
I'm doing this cause i want to run two external programs from my main application,and catch their return code.So,i have the g_ChildProcessPid variable which holds the pid for the external program.
I expected that every other child would cause waitpid to return 0,since i specify the WNOHANG flag,but in my code i have some calls to the "system" function that cause a "No child processes" error.
For example,in a function i do:
This causes waitpid to fail,with the following error:
Why?
Hi Friends,
Can any of you explain me about the below line of code?
mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`
Im not able to understand, what exactly it is doing :confused:
Any help would be useful for me.
Lokesha (4 Replies)
Consider this simple command line
bash -c 'echo $$ ; sleep 10000'This will print the newly created bash PID and sleep for a long time.
If I go to another terminal and do something like
ps -flax | grep leepI'll see something like
501 92418 91910 0 0:00.00 ttys000 0:00.00 bash -c echo $$... (5 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
Hi
I'm trying to write some code to confirm there is only one running instance in memory like below:
/usr/ucb/ps -auxww | egrep -v 'grep |vi |tail |more |cat ' | egrep ${SCRIPT_NAME} | egrep -v " \-h| \-help| \-v"
But sometimes i found there is some child processes are are created as... (4 Replies)
Hi,
when i grep for the process "XYZ" , there will be some good number of processes with that name, i want to kill all the these processes at a time using shell script?
Any help needed for this action.
Thanks
Regards,
Anil (6 Replies)
How to use "mailx" command to do e-mail reading the input file containing email address, where column 1 has name and column 2 containing “To” e-mail address
and column 3 contains “cc” e-mail address to include with same email.
Sample input file, email.txt
Below is an sample code where... (2 Replies)
Hello.
System : opensuse leap 42.3
I have a bash script that build a text file.
I would like the last command doing :
print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt
where :
print_cmd ::= some printing... (1 Reply)
Hi 2 all,
i have had AIX 7.2
:/# /usr/IBMAHS/bin/apachectl -v
Server version: Apache/2.4.12 (Unix)
Server built: May 25 2015 04:58:27
:/#:/# /usr/IBMAHS/bin/apachectl -M
Loaded Modules:
core_module (static)
so_module (static)
http_module (static)
mpm_worker_module (static)
... (3 Replies)
Discussion started by: penchev
3 Replies
LEARN ABOUT CENTOS
bsd_signal
BSD_SIGNAL(3P) POSIX Programmer's Manual BSD_SIGNAL(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
bsd_signal - simplified signal facilities
SYNOPSIS
#include <signal.h>
void (*bsd_signal(int sig, void (*func)(int)))(int);
DESCRIPTION
The bsd_signal() function provides a partially compatible interface for programs written to historical system interfaces (see APPLICATION
USAGE).
The function call bsd_signal(sig, func) shall be equivalent to the following:
void (*bsd_signal(int sig, void (*func)(int)))(int)
{
struct sigaction act, oact;
act.sa_handler = func;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, sig);
if (sigaction(sig, &act, &oact) == -1)
return(SIG_ERR);
return(oact.sa_handler);
}
The handler function should be declared:
void handler(int sig);
where sig is the signal number. The behavior is undefined if func is a function that takes more than one argument, or an argument of a dif-
ferent type.
RETURN VALUE
Upon successful completion, bsd_signal() shall return the previous action for sig. Otherwise, SIG_ERR shall be returned and errno shall be
set to indicate the error.
ERRORS
Refer to sigaction().
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
This function is a direct replacement for the BSD signal() function for simple applications that are installing a single-argument signal
handler function. If a BSD signal handler function is being installed that expects more than one argument, the application has to be modi-
fied to use sigaction(). The bsd_signal() function differs from signal() in that the SA_RESTART flag is set and the SA_RESETHAND is clear
when bsd_signal() is used. The state of these flags is not specified for signal().
It is recommended that new applications use the sigaction() function.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
sigaction(), sigaddset(), sigemptyset(), signal(), the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE /The Open Group 2003 BSD_SIGNAL(3P)