Using C language to use system calls


 
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Homework and Emergencies Homework & Coursework Questions Using C language to use system calls
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Old 11-22-2012
Quote:
Originally Posted by femchi
Code:
execl("/usr/bin/find","find . -maxdepth 1 -perm 644",(char *)NULL);

it doesnt work properly. do you know what is the problem?
Like they said, it's not a shell, it doesn't split for you.

Also, if it did work, your program would immediately quit, because execl doesn't launch a new program -- it replaces your current program. If you want to create a new process, you have to fork first, then exec. Watch the return value of fork carefully. It creates a clone of your process, and its return value is the only thing which tells them which is which. You have to make sure your child process only does what the child should be doing and not anything else, make sure it quits if exec doesn't work and such.
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ODOT(1) 						User Contributed Perl Documentation						   ODOT(1)

NAME
Odot - A task list manager SYNOPSIS
odot [FILE] DESCRIPTION
Odot is a task list manager that organizes tasks hierarchically and emphasizes ones which are due. You can add tasks by either using the "Add" button at the bottom or the right click context menu. A new row will be appended and you can immediately start editing it. Tasks can be modified by highlighting the row and activating the cell that should be edited. Cells are activated by either clicking on them or by pressing [Enter] when they are focused. Existing tasks can be deleted with the "Delete" button, the equivalent menu entry or by hitting the [Del] key. When editing a node, you can press [Up] or [Down] to commit changes to the current node and move to and edit the previous or next node. You can reorder tasks by dragging and dropping them wherever you like or by using [Alt] plus the arrow key that denotes the direction you want. Indenting and unindenting can also be achieved via [Tab] and [Backspace] respectively. You can sort the children of a task alpha- betically by using the "Sort" or the "Sort Recursively" menu item. You can cut / copy and paste nodes including all their children with [Ctrl]+[x] / [Ctrl]+[C] and [Ctrl]+[v]. Every change is undoable by pressing [Ctrl]+[z] and every undone change is redoable by pressing [Ctrl]+[Shift]+[z]. If its due date is only two days ahead of the current date, the task will be printed bold. If a task is due today, it's printed bold and italic. If a task is overdue, it's printed italic. If a due task is hidden because one of its ancestors is collapsed, these ancestors are printed underlined. OPTIONS
You can specify where Odot should store the tasks by passing a filename as a commandline argument. The default is ~/.odot. AUTHOR
Torsten Schoenfeld <kaffeetisch@gmx.de>. COPYRIGHT
Copyright (C) 2003-2004 Torsten Schoenfeld This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA perl v5.8.7 2005-12-07 ODOT(1)