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Top Forums UNIX for Advanced & Expert Users How to know process is running or not? Post 302374926 by Gopi Krishna P on Thursday 26th of November 2009 01:03:32 AM
Old 11-26-2009
How to know process is running or not?

please suggest me a way to write c program that takes pattern of the process and returns true or false


my case is i need to keep track of dhcpcd

dhcpcd -d eth1

so i tried popen("ps -ef | grep dhcpcd | grep eth1 | wc -l", "r");

but pipe is storing 1 or 2 when not running
and 2 or 3 when running.

please suggest a good way to do this

is there any api in linux for the same instead of doing file operations.

Last edited by Gopi Krishna P; 11-26-2009 at 02:08 AM..
 

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explain_popen_or_die(3) 				     Library Functions Manual					   explain_popen_or_die(3)

NAME
explain_popen_or_die - process I/O and report errors SYNOPSIS
#include <libexplain/popen.h> FILE *explain_popen_or_die(const char *command, const char *flags); DESCRIPTION
The explain_popen_or_die function is used to call the popen(3) system call. On failure an explanation will be printed to stderr, obtained from explain_popen(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: FILE *fp = explain_popen_or_die(command, flags); command The command, exactly as to be passed to the popen(3) system call. flags The flags, exactly as to be passed to the popen(3) system call. Returns: This function only returns on success, see popen(3) for more information. On failure, prints an explanation and exits. SEE ALSO
popen(3) process I/O explain_popen(3) explain popen(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_popen_or_die(3)
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