Hi,
My machine is a Unixware 7.1.3 is a files server, and I had never problem with that machine, but since two days, the machine presents slows problems, i think that the problem is te device interrupts, I had checked all and I dont found it any problem.
Any idea?
Thanks, (sorry my... (2 Replies)
Well, I don't know where exactly to ask this doubt so I'm asking in the newbie section. I was reading about traps and interrupts when I thought of traps as something that cease the control of the OS from the user and interrupts that cease the control yet provide support for multitasking. Am I right... (3 Replies)
Hi. I have a program whose job it is to manage 15 child processes. Sometimes these children die (sometimes deliberately other times with a SEGV). This causes a SIGCHLD to be sent to my program which uses waitpid() in the signal handler to gather information and, in most cases, restart the child.... (3 Replies)
Hi,
I'm working on an AMD opteron running Linux 2.6.28.6
I want to preload a module specific register (MSR) with a value to have it overflow after a number of a specific event counts. As I understand, when the counter in the register overflows, an interrupt will be generated and handled by the... (2 Replies)
am doing performance monitoring to our server through snmp. i need to convert the interrupts raw value (ssRawInterrupts) in UCD-SNMP-MIB to per sec (Interrupts/Sec).
What is the exact formula to find the above one. Guide me please.
Thanks in advance. (1 Reply)
Hi Gurus,
I have a situation runing my ETL tools on the below server. The throughput while processing data is coming very low. When i tried to analyse the CPU stats i got colleceted the mpstat.
Server Physical Host Name *********com
IP**.***.**
OS Type Linux
OS Classlinux red hat... (3 Replies)
Hi folks!
I have been reading Vahalia's Unix Internals book, which states the following in the chapter dedicated to signals:
Given that, my understanding is that processes running in user mode don't become aware of signals until they switch to kernel mode, where the issig() function is called... (3 Replies)
Discussion started by: Tru69
3 Replies
LEARN ABOUT ULTRIX
getopt
getopt(3) Library Functions Manual getopt(3)Name
getopt - get option letter from argument vector
Syntax
#include <stdio.h>
int getopt (argc, argv, optstring)
int argc;
char **argv;
char *optstring;
extern char *optarg;
extern int optind, opterr;
Description
The subroutine returns the next option letter in argv that matches a letter in optstring. The optstring is a string of recognized option
letters; if a letter is followed by a colon, the option is expected to have an argument that may or may not be separated from it by white
space. The optarg is set to point to the start of the option argument on return from
The function places in optind the argv index of the next argument to be processed. The external variable optind is automatically initial-
ized to 1 before the first call to
When all options have been processed (that is, up to the first non-option argument), returns EOF. The special option -- may be used to
delimit the end of the options; EOF will be returned, and -- will be skipped.
Diagnostics
The function prints an error message on stderr and returns a question mark (?) when it encounters an option letter that is not included in
optstring. Setting opterr to 0 disables this error message.
Examples
The following code fragment shows how one might process the arguments for a command that can take the mutually exclusive options a and b,
and the options f and o, both of which require arguments:
#include <stdio.h>
main (argc, argv)
int argc;
char **argv;
{
int c;
extern int optind, opterr;
extern char *optarg;
.
.
.
.
while ((c = getopt (argc, argv, "abf:o:")) != EOF)
switch (c) {
case 'a':
if (bflg)
errflg++;
else
aflg++;
break;
case 'b':
if (aflg)
errflg++;
else
bproc( );
break;
case 'f':
ifile = optarg;
break;
case 'o':
ofile = optarg;
bufsiza = 512;
break;
case '?':
errflg++;
}
if (errflg) {
fprintf (stderr, "usage: . . . ");
exit (2);
}
for ( ; optind < argc; optind++) {
if (access (argv[optind], 4)) {
.
.
.
}
See Alsogetopt(1)getopt(3)