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BSD 2.11 - man page for strerror (bsd section 3)

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PERROR(3)										PERROR(3)

       perror, strerror - system error messages

       char *s;

       #include <string.h>

       char *
       int errnum;

       The strerror() and perror() functions look up the error message string corresponding to an
       error number.

       The strerror() function accepts an error number argument errnum and returns a  pointer  to
       the corresponding message string.

       The  perror()  function	finds the error message corresponding to the current value of the
       global variable errno (intro(2)) and writes it, followed by a  newline,	to  the  standard
       error file descriptor.  If the argument string is non-NULL, it is prepended to the message
       string and separated from it by a colon and space (`: ').  If string  is  NULL,	only  the
       error message string is printed.

       If  errnum  is  not  a  recognized  error  number,  the	error message string will contain
       ``Unknown error: '' followed by the error number in decimal.

       The error messages are stored in a data file now rather than  an  in  memory  array.   See

       mkerrlst(1), intro(2), psignal(3), strerror(3), syserror(3), syserror(5)

       The  strerror() function returns its result in a static buffer which may be overwritten by
       subsequent calls.

       The array sys_errlist[] and the global sys_nerr are obsolete and should not be used.  They
       have, for the time being, been placed in an object library liberrlst.a.

4th Berkeley Distribution		  March 21, 1996				PERROR(3)
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