4.3BSD-UWisc/man/cat3/perror.3

PERROR(3)           UNIX Programmer's Manual            PERROR(3)



NAME
     perror, sys_errlist, sys_nerr - system error messages

SYNOPSIS
     perror(s)
     char *s;

     int sys_nerr;
     char *sys_errlist[];

DESCRIPTION
     _P_e_r_r_o_r produces a short error message on the standard error
     file describing the last error encountered during a call to
     the system from a C program.  First the argument string _s is
     printed, then a colon, then the message and a new-line.
     Most usefully, the argument string is the name of the pro-
     gram which incurred the error.  The error number is taken
     from the external variable _e_r_r_n_o (see _i_n_t_r_o(2)), which is
     set when errors occur but not cleared when non-erroneous
     calls are made.

     To simplify variant formatting of messages, the vector of
     message strings _s_y_s__e_r_r_l_i_s_t is provided; _e_r_r_n_o can be used
     as an index in this table to get the message string without
     the newline.  _S_y_s__n_e_r_r is the number of messages provided
     for in the table; it should be checked because new error
     codes may be added to the system before they are added to
     the table.

SEE ALSO
     intro(2), psignal(3)
























Printed 12/27/86          May 15, 1985                          1