Contents|Index|Previous|Next

perror
[print an error message on standard error]

SYNOPSIS
#include <stdio.h>
void perror(char *prefix);
void _perror_r(void *reent, char *prefix);

DESCRIPTION
Use perror to print (on standard error) an error message corresponding to the current value of the global variable, errno.

Unless you use NULL as the value of the argument prefix, the error message will begin with the string at prefix, followed by a colon and a space (: ). The remainder of the error message is one of the strings described for strerror.

The alternate function, _perror_r, is a reentrant version. The extra argument, reent, is a pointer to a reentrancy structure.

RETURNS
perror returns no result.

COMPLIANCE
ANSI C requires perror, but the strings issued vary from one implementation to another.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.