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exit(0) versus exit(1)

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# 8  
Old 06-22-2007
Quote:
Originally Posted by porter
What to do you want to tell your parent?

The rules is generally if all went went and you did what you were told (as all children should) then return 0.

If something went wrong then return non-zero, preferably between 1 and 127.

This is termed the exit code of a process and in a shell becomes the "$?" value.

This allows you to do the following

Code:
if myprogram
then 
      echo all went well
else 
      echo bad things
fi

can it be bigger than 127?
thanks
# 9  
Old 06-22-2007
It can in many cases. Porter is saying <= 127 becasue that is the largest signed value which you can have in a single byte.
# 10  
Old 06-22-2007
Look in your /usr/include directory (or wherever your standard C headers are)
and find sysexits.h It is part of a lot of distributions.

Read the header file - it gives some proposed standards for exit values that are meaningful and consistent. You will find that a lot of programs return values like 64. It comes from sysexists.h

No sysexits.h file:
http://www.freebsd.org/cgi/man.cgi?q...SE&format=html
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