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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 302388288 by pludi on Wednesday 20th of January 2010 02:17:36 AM
Old 01-20-2010
From the man page of strcat (emphasis added)
Quote:
The strcat() function appends the src string to the dest string, overwriting the null byte ('\0') at the end of dest, and then adds a terminating null byte. The strings may not overlap, and the dest string must have enough space for the result.[...]
If src contains n or more characters, strcat() writes n+1 characters to dest (n from src plus the terminating null byte). Therefore, the size of dest must be at least strlen(dest)+n+1.
So as soon as you read more that 512 bytes from the process (which, with netstat will happen almost guaranteed) you'll start trying to write into unreserved space. This space might already be claimed by another process, and so the system intervenes.

One approach might be to allocate a large enough part of memory at the beginning.
A better approach would be to allocate a bit of memory using malloc(), and expanding that if needed using realloc().
 

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LEARN ABOUT OSF1

rc2

rc2(8)							      System Manager's Manual							    rc2(8)

NAME

       rc2 - Run command script executed when entering a multiuser run level

SYNOPSIS

       rc2

DESCRIPTION

       The  rc2  script contains run commands that enable initialization of the system to a multiuser state; run level 2.  In addition to commands
       listed within the script itself, rc2 contains instructions to run certain commands found in the /sbin/rc2.d directory.  The script  defines
       the conditions under which the commands execute; some commands run if the system is booting, other commands execute if the system is chang-
       ing run levels.

       By convention, files in the /sbin/rc2.d directory begin with either the letter "K" or the letter "S" and are followed by a two-digit number
       and a filename; for example: K00lpd     S00savecore     S25uucp

       In  general,  the  system  starts commands that begin with the letter "S" and stops commands that begin with the letter "K."  Commands that
       begin with the letter "K" run only when the system is changing run levels from a higher to a lower level.  Commands  that  begin  with  the
       letter "S" run in all cases.  The numbering of commands in the /sbin/rc2.d directory is important since the numbers are sorted and the com-
       mands are run in ascending order.  Files in the /sbin/rc2.d directory are normally links to files in the /etc/init.d directory.

       An entry in the inittab file causes the system to execute the  rc2  run	commands,  for	example:  s2:23:wait:/sbin/rc2	<  /dev/console  >
       /dev/console 2>&1

       The  following operations are typical of those that result from executing the rc2 script and the commands located in the /sbin/rc2.d direc-
       tory.  The operation depends on which state the system is entering or exiting.  Setting the time zone Checking the current run level  Stop-
       ping  network  services	and daemons Starting (or stopping) system services and daemons Starting the cron daemon Setting up paging and dump
       facilities Setting up uucp files

       Setting the TIMEZONE variable is one of the first operations completed by the rc2 script.  This action provides the default time  zone  for
       subsequent commands.

FILES

       Specifies the command path Specifies the directory of commands that correspond to the run level

RELATED INFORMATION

       Commands:  init(8), rc0(8), rc3(8) delim off

																	    rc2(8)
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