1PERROR(3) Library Functions Manual PERROR(3)
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6 perror, sys_errlist, sys_nerr - system error messages
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9 perror(s)
10 char *s;
11 int sys_nerr;
13 char *sys_errlist[];
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16 Perror produces a short error message on the standard error file
17 describing the last error encountered during a call to the system from
18 a C program. First the argument string s is printed, then a colon,
19 then the message and a new-line. Most usefully, the argument string is
20 the name of the program which incurred the error. The error number is
21 taken from the external variable errno (see intro(2)), which is set
22 when errors occur but not cleared when non-erroneous calls are made.
23 To simplify variant formatting of messages, the vector of message
25 strings sys_errlist is provided; errno can be used as an index in this
26 table to get the message string without the newline. Sys_nerr is the
27 number of messages provided for in the table; it should be checked
28 because new error codes may be added to the system before they are
29 added to the table.
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32 intro(2)
33 PERROR(3)