exit function doubts


 
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# 1  
Old 10-25-2012
exit function doubts

At many places in program I see exit() being called with 2 passed as parameter to it.

Code:
exit(2);

What does this 2 stands for?
Can I get a list all such parameters to exit?

Last edited by rupeshkp728; 10-25-2012 at 04:39 PM.. Reason: code
# 2  
Old 10-25-2012
This is just a exit status code that script returns to what ever called it, most of the time it it is non-zero that means it is trying to tell the caller there was some type of error or exception condition that occurred.
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# 3  
Old 10-25-2012
Quote:
Originally Posted by rupeshkp728
Can I get a list all such parameters to exit?
Zero means success, anything else means some sort of error, but the exact meanings are specific to the program.
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# 4  
Old 10-25-2012
Some applications and UNIX code follow the sysexits protocol

For example see:
sysexits(3) - preferable exit codes for programs
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# 5  
Old 10-27-2012
Hello,

I want to know what is the meaning of code
exit(3);
# 6  
Old 10-27-2012
You have to ask the person who wrote the code. Lots of things simply return what appears to us as an arbitrary non-zero number on error. The man page usually indicates what the return codes mean -- if this error came from a command that is documented on your system.

A direct answer: nobody, by themselves, can know for sure without a lot of research. Either reading the original code or asking the coder is the best way to know. Sometimes a manpage can help.
# 7  
Old 10-31-2012
You could run
Code:
grep progname *

in any directory containing scripts that are written, where progname = the script that gives that exit. The program that called it will use the
Code:
$?

construct, if it is for a Bourne script, to decide what to do if the exit code = 3.
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