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Annotation of researchv10dc/dist/man/v4/man3/perror.3, revision 1.1

1.1     ! root        1: .th PERROR III 11/5/73
        !             2: .sh NAME
        !             3: perror \*- system error messages
        !             4: .sh SYNOPSIS
        !             5: .ft B
        !             6: perror(s)
        !             7: .br
        !             8: char *s;
        !             9: .s3
        !            10: int sys\*_nerr;
        !            11: .br
        !            12: char *sys\*_errlist[];
        !            13: .s3
        !            14: int errno;
        !            15: .ft R
        !            16: .br
        !            17: .sh DESCRIPTION
        !            18: .it Perror
        !            19: produces a short error message
        !            20: describing the last error encountered during a call
        !            21: to the system from a C program.
        !            22: First the argument string
        !            23: .it s
        !            24: is printed, then a colon, then the message and a new-line.
        !            25: Most usefully, the argument string is the name
        !            26: of the program which incurred the error.
        !            27: The error number is taken from the external variable
        !            28: .it errno,
        !            29: which is set when errors occur but not cleared when
        !            30: non-erroneous calls are made.
        !            31: .s3
        !            32: To simplify variant formatting
        !            33: of messages, the vector of message strings
        !            34: .it sys\*_errlist
        !            35: is provided;
        !            36: .it errno
        !            37: can be used as an index in this table to get the
        !            38: message string without the newline.
        !            39: .it Sys\*_nerr
        !            40: is the largest message number provided for in the table;
        !            41: it should be checked because new
        !            42: error codes may be added to the system before
        !            43: they are added to the table.
        !            44: .sh "SEE ALSO"
        !            45: Introduction to System Calls
        !            46: .sh BUGS

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