perror() function

perror(3)                                                           perror(3)



NAME
  perror -  Writes a message explaining a function error

LIBRARY

  Standard C Library (libc.a)

SYNOPSIS

  #include <errno.h>

  void perror (
          const char *string );
  extern char *sys_errlist[ ];
  extern int sys_nerr;

PARAMETERS

  string    A parameter string that contains the name of the program that
            caused the error. The ensuing printed message contains this
            string, a colon, and an explanation of the error.

DESCRIPTION

  The perror() function writes a message on the standard error output that
  describes the last error encountered by a function or library function. The
  error message includes the string parameter string followed by a : (colon),
  a blank, the message, and a newline character. The string parameter string
  should include the name of the program that caused the error. The error
  number is taken from errno, which is set when an error occurs, but is not
  cleared when a successful call is made.

  Use errno as an index into this table to get the message string without the
  newline character. The largest message number provided in the table is
  sys_nerr. Be sure to check sys_nerr because new error codes can be added to
  the system before they are added to the table.

NOTES

  AES Support Level:
                 Full use

RELATED INFORMATION

  Functions: printf(3) delim off