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@(#)perror.3 5.1 (Berkeley) 05/15/85

C 5 perror, gerror, ierrno - get system error messages subroutine perror (string)

character*(*) string subroutine gerror (string)

character*(*) string character*(*) function gerror() function ierrno()

Perror will write a message to fortran logical unit 0 appropriate to the last detected system error. String will be written preceding the standard error message.

Gerror returns the system error message in character variable string. Gerror may be called either as a subroutine or as a function.

Ierrno will return 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 might generate such errors return an error code after the call; that value is a more reliable indicator of what caused the error condition.

intro(2), perror(3)

D. L. Wasley, Introduction to the f77 I/O Library

String in the call to perror can be no longer than 127 characters.

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

UNIX system error codes are described in intro (2). The f77 I/O error codes and their meanings are: 100 ``error in format''

101 ``illegal unit number''

102 ``formatted io not allowed''

103 ``unformatted io not allowed''

104 ``direct io not allowed''

105 ``sequential io not allowed''

106 ``can't backspace file''

107 ``off beginning of record''

108 ``can't stat file''

109 ``no * after repeat count''

110 ``off end of record''

111 ``truncation failed''

112 ``incomprehensible list input''

113 ``out of free space''

114 ``unit not connected''

115 ``read unexpected character''

116 ``blank logical input field''

117 ``'new' file exists''

118 ``can't find 'old' file''

119 ``unknown system error''

120 ``requires seek ability''

121 ``illegal argument''

122 ``negative repeat count''

123 ``illegal operation for unit''