How to know process is running or not?

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explain_popen_or_die

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)

UNIX for Advanced & Expert Users