libexplain  1.4.D001
Functions
libexplain/message/truncate.c File Reference
#include <libexplain/ac/errno.h>
#include <libexplain/ac/unistd.h>
#include <libexplain/truncate.h>

Go to the source code of this file.

Functions

void explain_message_truncate (char *message, int message_size, const char *pathname, off_t length)

Function Documentation

void explain_message_truncate ( char *  message,
int  message_size,
const char *  pathname,
off_t  length 
)

The explain_message_truncate function is used to obtain an explanation of an error returned by the truncate(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:
messageThe location in which to store the returned message. If a suitable message return buffer is supplied, this function is thread safe.
message_sizeThe size in bytes of the location in which to store the returned message.
pathnameThe original pathname, exactly as passed to the truncate(2) system call.
lengthThe original length, exactly as passed to the truncate(2) system call.
Example:
This function is intended to be used in a fashion similar to the following example:
 if (truncate(pathname, length) < 0)
 {
     char message[3000];
     explain_message_truncate(message, sizeof(message), pathname, length);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }
The above code example is available pre-packaged as the explain_truncate_or_die function.

Definition at line 26 of file truncate.c.