perror, gerror, ierrno (3f)

writes system error messages

Syntax

  character*len string
  external perror
  call perror ( string )

  character*len string
  external gerror
  call gerror ( string )

  integer*4 ierrno, lsterr
  external ierrno
  lsterr = ierrno( )

Description

  The perror subroutine writes a message to logical unit 0 appropriate to the
  last detected system error.  The string argument precedes the standard
  error message. The gerror subroutine writes a system error message in a
  character variable. If an error occurs during either of these subroutines,
  you can use errsns to get the Fortran error generated.

  The ierrno function returns the error number of the last detected system
  error.  This number is updated only when an error actually occurs.  Most
  routines and I/O statements that can generate such errors return an error
  code after the call. The error code is a more reliable indicator of what
  caused the error condition.

  System error codes are described in intro(2).

Restrictions

  The string argument in the call to perror can be no longer than 132
  characters.

  The length of the string returned by gerror is determined by the calling
  program.

See Also

  intro(2), perror(3)