08-27-2013
It means, the list of signal-safe functions are safe to use inside a signal handler. The POSIX stuff means that this is what's expected of a UNIX system.
How would you simulate shutdown without being shutdown? Killing all processes but not turning off the computer?
This User Gave Thanks to Corona688 For This Post:
8 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
Iam calling 3 sql scripts through one shell script 'rmia.sh'.
Till now this was working fine, but last time while calling the SQL scripts,
Oracle was down. But amazingly the exit status was '0' (success)!!!
Below is the shell code:
#!/usr/bin/ksh -x
assign_file asql a.sql 1... (15 Replies)
Discussion started by: ganapati
15 Replies
2. Shell Programming and Scripting
Ok here is the problem we have 2 v440 with same IP address running solars 9. one remains on the other remains off. They are both configured exactly the same for redundant purposes for the software we use. This was the best/worst idea. Great because down time is only a mere minutes. The bad is the... (7 Replies)
Discussion started by: deaconf19
7 Replies
3. Solaris
I am working on a SUN T2000 machine with Solaris 10 running on it. When I checked the system this morning, I found it to be turned off. The lastreboot command showed that the system had been shut down the previous night.
I want to find out how the system was shut down. I have run hardware health... (2 Replies)
Discussion started by: batman727
2 Replies
4. Shell Programming and Scripting
I want to only send a mail before my system goes for a shutdown or reboot. I don't want a mail when it comes up after a reboot or is normally started.. How can i achieve this? (2 Replies)
Discussion started by: proactiveaditya
2 Replies
5. Windows & DOS: Issues & Discussions
Hello,
from last few days my laptop is not whutting down properly.. when ever i ty to shutdown it restarts again.. what may be problem?? antivirus is updated till date.. and i use windows xp sp2....
regards,
deepak. (5 Replies)
Discussion started by: smarty86
5 Replies
6. Shell Programming and Scripting
Hi everybody,
I am working on a bigger awk script in which one part is comparing the size of two files.
I want to evaluate which file is bigger and then just save the bigger one.
I got it all working except for the part where I want to figure out which file is bigger; the one awk is currently... (2 Replies)
Discussion started by: iMeal
2 Replies
7. Solaris
I am working on sunos solaris. I want to know which is good for system shut-down ? (3 Replies)
Discussion started by: Jitesh Varshney
3 Replies
8. Red Hat
Hi All,
I have one situation to shut-down the system through shell script.I need script command to shut-down the system and process should end(safe-mode) the MyEclipse. (0 Replies)
Discussion started by: stsivaraj
0 Replies
LEARN ABOUT NETBSD
pcap_breakloop
PCAP_BREAKLOOP(3) Library Functions Manual PCAP_BREAKLOOP(3)
NAME
pcap_breakloop - force a pcap_dispatch() or pcap_loop() call to return
SYNOPSIS
#include <pcap/pcap.h>
void pcap_breakloop(pcap_t *);
DESCRIPTION
pcap_breakloop() sets a flag that will force pcap_dispatch() or pcap_loop() to return rather than looping; they will return the number of
packets that have been processed so far, or -2 if no packets have been processed so far.
This routine is safe to use inside a signal handler on UNIX or a console control handler on Windows, as it merely sets a flag that is
checked within the loop.
The flag is checked in loops reading packets from the OS - a signal by itself will not necessarily terminate those loops - as well as in
loops processing a set of packets returned by the OS. Note that if you are catching signals on UNIX systems that support restarting system
calls after a signal, and calling pcap_breakloop() in the signal handler, you must specify, when catching those signals, that system calls
should NOT be restarted by that signal. Otherwise, if the signal interrupted a call reading packets in a live capture, when your signal
handler returns after calling pcap_breakloop(), the call will be restarted, and the loop will not terminate until more packets arrive and
the call completes.
Note also that, in a multi-threaded application, if one thread is blocked in pcap_dispatch(), pcap_loop(), pcap_next(), or pcap_next_ex(),
a call to pcap_breakloop() in a different thread will not unblock that thread; you will need to use whatever mechanism the OS provides for
breaking a thread out of blocking calls in order to unblock the thread, such as thread cancellation in systems that support POSIX threads.
Note that pcap_next() and pcap_next_ex() will, on some platforms, loop reading packets from the OS; that loop will not necessarily be ter-
minated by a signal, so pcap_breakloop() should be used to terminate packet processing even if pcap_next() or pcap_next_ex() is being used.
pcap_breakloop() does not guarantee that no further packets will be processed by pcap_dispatch() or pcap_loop() after it is called; at most
one more packet might be processed.
If -2 is returned from pcap_dispatch() or pcap_loop(), the flag is cleared, so a subsequent call will resume reading packets. If a posi-
tive number is returned, the flag is not cleared, so a subsequent call will return -2 and clear the flag.
SEE ALSO
pcap(3), pcap_loop(3), pcap_next_ex(3)
5 April 2008 PCAP_BREAKLOOP(3)