libexplain/message/ustat.c File Reference

#include <libexplain/ac/errno.h>
#include <libexplain/ac/linux/types.h>
#include <libexplain/ac/sys/types.h>
#include <libexplain/ac/ustat.h>
#include <libexplain/ustat.h>

Go to the source code of this file.

Functions
void	explain_message_ustat (char *message, int message_size, dev_t dev, struct ustat *ubuf)

---

Function Documentation

void explain_message_ustat	(	char *	message,
		int	message_size,
		dev_t	dev,
		struct ustat *	data
	)

The explain_message_ustat function is used to obtain an explanation of an error returned by the ustat(2) 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.
dev	The original dev, exactly as passed to the ustat(2) system call.
data	The original data, exactly as passed to the ustat(2) system call.

Example:

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

 if (ustat(dev, data) < 0)
 {
     char message[3000];
     explain_message_ustat(message, sizeof(message), dev, data);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }

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

Definition at line 28 of file ustat.c.