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Annotation of cci/usr/src/man/man3/perror.3, revision 1.1.1.1

1.1       root        1: .TH PERROR 3  "19 January 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: perror, sys_errlist, sys_nerr \- system error messages
                      5: .SH SYNOPSIS
                      6: .nf
                      7: .B perror(s)
                      8: .B char *s;
                      9: .PP
                     10: .B int sys_nerr;
                     11: .B char *sys_errlist[];
                     12: .fi
                     13: .SH DESCRIPTION
                     14: .I Perror
                     15: produces a short error message on the standard error file
                     16: describing the last error encountered during a call
                     17: to the system from a C program.
                     18: First the argument string
                     19: .I s
                     20: is printed, then a colon, then the message and a new-line.
                     21: Most usefully, the argument string is the name
                     22: of the program which incurred the error.
                     23: The error number is taken from the external variable
                     24: .I errno
                     25: (see
                     26: .IR intro (2)),
                     27: which is set when errors occur but not cleared when
                     28: non-erroneous calls are made.
                     29: .PP
                     30: To simplify variant formatting of messages, the vector of message strings
                     31: .I sys_errlist
                     32: is provided;
                     33: .I errno
                     34: can be used as an index in this table to get the
                     35: message string without the newline.
                     36: .I Sys_nerr
                     37: is the number of messages provided for in the table;
                     38: it should be checked because new error codes may be added to the system before
                     39: they are added to the table.
                     40: .SH "SEE ALSO"
                     41: intro(2),
                     42: psignal(3)

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