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

Go to the source code of this file.

Functions

void explain_message_sethostname (char *message, int message_size, const char *name, size_t name_size)

Function Documentation

void explain_message_sethostname ( char *  message,
int  message_size,
const char *  name,
size_t  name_size 
)

The explain_message_sethostname function is used to obtain an explanation of an error returned by the sethostname(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.

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

 if (sethostname(name, name_size) < 0)
 {
     char message[3000];
     explain_message_sethostname(message, sizeof(message), name, name_size);
     fprintf(stderr, "%s\n", message);
     exit(EXIT_FAILURE);
 }

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

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.
nameThe original name, exactly as passed to the sethostname(2) system call.
name_sizeThe original name_size, exactly as passed to the sethostname(2) system call.

Definition at line 26 of file sethostname.c.