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SYSEXITS(3) Library Functions Manual SYSEXITS(3)

sysexitsexit codes for programs

#include <sysexits.h>

Some programs use defined error codes to distinguish between possible errors. However, most programs in OpenBSD do not.

The successful exit is always indicated by a status of 0, or EX_OK. Error numbers begin at EX__BASE to reduce the possibility of clashing with other exit statuses that random programs may already return. The meaning of the code is approximately as follows:

The command was used incorrectly, e.g., with the wrong number of arguments, a bad flag, bad syntax in a parameter, or whatever.
An input file (not a system file) did not exist or was not readable. This could also include errors like “No message” to a mailer (if it cared to catch it).
A service is unavailable. This can occur if a support program or file does not exist. This can also be used as a catch-all message when something you wanted to do doesn't work, but you don't know why.
An internal software error has been detected. This should be limited to non-operating system related errors if possible.
An operating system error has been detected. This is intended to be used for such things as “cannot fork”, or “cannot create pipe”. It includes things like getuid(2) returning a user that does not exist in the passwd file.
Some system file (e.g., /etc/passwd, /var/run/utmp) does not exist, cannot be opened, or has some sort of error (e.g., syntax error).
A (user specified) output file cannot be created.
An error occurred while doing I/O on some file.
Temporary failure, indicating something that is not really an error. For example that a mailer could not create a connection, and the request should be reattempted later.
The remote system returned something that was “not possible” during a protocol exchange.
You did not have sufficient permission to perform the operation. This is not intended for file system problems, which should use EX_NOINPUT or EX_CANTCREAT, but rather for higher level permissions.
Something was found in an unconfigured or misconfigured state.

The numerical values corresponding to the symbolical ones are given in parentheses for easy reference.

_exit(2), exit(3)

The sysexits file first appeared in 4.0BSD for use by the delivermail utility, later renamed to sendmail(8).

Eric Allman invented the sysexits file in 1980. This man page was written by Joerg Wunsch, based on Eric's original comments found in <sysexits.h>.

The choice of an appropriate exit value is often ambiguous.

December 30, 2015 OpenBSD-6.0