process on file


 
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Old 06-20-2004
process on file

Hello,

I need to write this C program:

MyProgram <user>

that write on myfile.txt file all <users> 'process.

MyProgram must call the ps -u <user> command, but with an exec or with a system?

can any one help me?

Thank you
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explain_write_or_die(3) 				     Library Functions Manual					   explain_write_or_die(3)

NAME
explain_write_or_die - write to a file descriptor and report errors SYNOPSIS
#include <libexplain/write.h> void explain_write_or_die(int fildes, const void *data, long data_size); DESCRIPTION
The explain_write_or_die function is used to call the write(2) system call. On failure an explanation will be printed to stderr, obtained from explain_write(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: ssize_t result = explain_write_or_die(fildes, data, data_size); fildes The fildes, exactly as to be passed to the write(2) system call. data The data, exactly as to be passed to the write(2) system call. data_size The data_size, exactly as to be passed to the write(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
write(2) write to a file descriptor explain_write(3) explain write(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_write_or_die(3)