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Using C language to use system calls

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Homework and Emergencies Homework & Coursework Questions Using C language to use system calls
# 8  
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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LEARN ABOUT FREEBSD

sade

SADE(8) 						    BSD System Manager's Manual 						   SADE(8)

NAME

     sade -- sysadmins disk editor

SYNOPSIS

     sade

DESCRIPTION

     The sade utility is used for various disk administration tasks on FreeBSD systems.

     It is generally invoked without arguments for the default behavior, where the main menu is presented.

NOTES

     The sade utility aims to provide a handy tool for disk management tasks on an already installed system.  The goal is to provide the same text
     interface for disk management in bsdinstall(8) in the post-installation environment.

SEE ALSO

     bsdinstall(8), gpart(8)

HISTORY

     A program called sade first appeared in FreeBSD 6.3 as a utility encapsulating features from the sysinstall(8) installer. It was replaced in
     FreeBSD 10.0 with the equivalent part of bsdinstall(8).

AUTHORS

     Nathan Whitehorn <nwhitehorn@FreeBSD.org>

BUGS

     The utility misses a lot of nice features, such as tools for manipulating gmirror(8).  These will be added later.

BSD
								 December 30, 2012							       BSD