perror man page on Ultrix

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perror(3)							     perror(3)

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

Syntax
       void perror(s)
       char *s;

       int sys_nerr;
       char *sys_errlist[];

       #include <string.h>

       char *strerror(err)
       int err;

Description
       The  subroutine	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 , if it is not a null
       pointer, is printed followed by a colon and a space; then  the  message
       and  a new line are printed.  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 which is set when errors occur
       but not cleared when nonerroneous calls are made.  For further informa‐
       tion, see

       To  simplify  variant  formatting  of  messages,	 the vector of message
       strings sys_errlist is provided; errno can be used as an index in  this
       table  to get the message string without the new line.  The 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 function will also return  a  pointer  to  the
       message text for a given error number.

See Also
       intro(2), psignal(3)

								     perror(3)
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