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Full Discussion: using popen with background process
Top Forums Programming using popen with background process Post 302085952 by matrixmadhan on Monday 21st of August 2006 10:16:22 AM
Old 08-21-2006
jim,

thanks for the reply..

i can very well understand that forking will not create new streams...

to check out whether process is running or not .. i tried out a simple code

Code:
# include<stdio.h>
int main()
{
  char ps[100];
  char bin[100]="/users/mad/net/small";
  
  sprintf(ps, "sh -c /usr/bin/ps -fu %s | /usr/bin/grep '%s' | /usr/bin/grep -cv 'grep' > two.tmp", getlogin(), bin);
  system(ps);
  system("sh -c \"compress ftplog.log\"");
  return 0;
}

i ran this with controlling terminal - no problem - worked as expected
ran this as background and without any controlling terminal - none of the operation specified in system command is working..

where am i making the mistake ?
 

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LEARN ABOUT OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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