libexplain/message/setvbuf.c File Reference

#include <libexplain/ac/errno.h>
#include <libexplain/ac/stdio.h>
#include <libexplain/setvbuf.h>

Go to the source code of this file.

Functions
void	explain_message_setvbuf (char *message, int message_size, FILE *fp, char *data, int mode, size_t size)

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Function Documentation

void explain_message_setvbuf	(	char *	message,
		int	message_size,
		FILE *	fp,
		char *	data,
		int	mode,
		size_t	size
	)

The explain_message_setvbuf function is used to obtain an explanation of an error returned by the setvbuf(3) system call. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail.

The errno global variable will be used to obtain the error value to be decoded.

Parameters:

message	The location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe.
message_size	The size in bytes of the location in which to store the returned message.
fp	The original fp, exactly as passed to the setvbuf(3) system call.
data	The original data, exactly as passed to the setvbuf(3) system call.
mode	The original mode, exactly as passed to the setvbuf(3) system call.
size	The original size, exactly as passed to the setvbuf(3) system call.

Example:

This function is intended to be used in a fashion similar to the following example:

 if (setvbuf(fp, data, mode, size) < 0)
 {
     char message[3000];
     explain_message_setvbuf(message, sizeof(message), fp, data, mode, size);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }

The above code example is available pre-packaged as the explain_setvbuf_or_die function.

Definition at line 26 of file setvbuf.c.