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Full Discussion: C system() how to send the output to an array??
Top Forums Programming C system() how to send the output to an array?? Post 302388277 by Jess83 on Wednesday 20th of January 2010 02:01:26 AM
Old 01-20-2010
Yeah i got it to work with popen the following way

Code:
  FILE *in;
  extern FILE *popen();
  char buff[512];
  char newline[100];
  char nstat[512];
  
  strcpy(newline, "\r\n");  



  if (!(in = popen("netstat -n", "r"))) {
    exit(1);
  }
 
  
  while (fgets(buff, sizeof(buff), in)) {
    strcat(nstat, buff);
    }

  strcat(nstat, newline); 
 

  pclose(in);

Works fine on Gentoo but crashed to "segmentation fault" on Ubuntu and I foresee it do the same on MAC OS X due to memory protection... I dumped the core and ran it through gdb now I know its in the strcat() function so my understanding of it is that is that after buff is wrote once to nstat then nstat is then made into read only so when newline tries to be appended to nstat it can't then fails to segmentation fault right? How can I get around this? anyone??
 

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LEARN ABOUT DEBIAN

nstat

RTACCT(8)						      System Manager's Manual							 RTACCT(8)

NAME

       nstat, rtacct - network statistics tools.

SYNOPSIS

       Usage: nstat [ -h?vVzrnasd:t: ] [ PATTERN [ PATTERN ] ]
       Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]

DESCRIPTION

       nstat and rtacct are simple tools to monitor kernel snmp counters and network interface statistics.

OPTIONS

       -h, --help Print help

       -V, --version
	      Print version

       -z, --zero
	      Dump zero counters too. By default they are not shown.

       -r, --reset
	      Reset history.

       -n, --nooutput
	      Do not display anything, only update history.

       -a, --ignore
	      Dump absolute values of counters. The default is to calculate increments since the previous use.

       -s, --noupdate
	      Do  not  update  history, so that the next time you will see counters including values accumulated to the moment of this measurement
	      too.

       -j, --json
	      Display results in JSON format.

       -d, --interval <INTERVAL>
	      Run in daemon mode collecting statistics. <INTERVAL> is interval between measurements in seconds.

       Time interval to average rates. Default value is 60 seconds.

       SEE ALSO
	      lnstat(8)

								   27 June, 2007							 RTACCT(8)
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