perror man page on NeXTSTEP

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PERROR(3S)							    PERROR(3S)

NAME
       perror, strerror, sys_errlist, sys_nerr - system error messages

SYNOPSIS
       #include <stdio.h>

       void perror(char *s);

(ALSO AVAILABLE IN BSD)
       #include <string.h>

       char *strerror(int errnum);

       extern int sys_nerr;

       extern char *sys_errlist[];

DESCRIPTION
       Perror  produces	 a  short  error  message  on  the standard error file
       describing the last error encountered during a call to the system  from
       a  C  program.	First  the argument string s is printed, then a colon,
       then the message and a new-line.	 Most usefully, the argument string is
       the  name of the program which incurred the error.  The error number is
       taken from the external variable errno (see  intro(2)),	which  is  set
       when errors occur but not cleared when non-erroneous calls are made.

       To  simplify  variant  formatting  of  messages,	 the vector of message
       strings can also be obtained by using the strerror function; errno  can
       be  used	 as  the  argument to this function to get the message string,
       without a trailing newline.

       Although not specified by ANSI C	 or  POSIX,  for  compatibility,  this
       implementation  also  permits directly retrieving the vector of message
       strings from sys_errlist.  Sys_nerr is the number of messages  provided
       for  in	the table; it should be checked because new error codes may be
       added to the system before they are added to the table.	The use of the
       strerror function is preferred over this mechanism.

SEE ALSO
       intro(2), psignal(3)

				 June 23, 1989			    PERROR(3S)
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