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Annotation of researchv10dc/dist/man/v4/man3/perror.3, revision 1.1.1.1

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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