Provided by: libexplain-dev_1.4.D001-7_amd64 
NAME
explain_tcsendbreak - explain tcsendbreak(3) errors
SYNOPSIS
#include <libexplain/tcsendbreak.h>
const char *explain_tcsendbreak(int fildes, int duration);
const char *explain_errno_tcsendbreak(int errnum, int fildes, int duration);
void explain_message_tcsendbreak(char *message, int message_size, int fildes, int
duration);
void explain_message_errno_tcsendbreak(char *message, int message_size, int errnum, int
fildes, int duration);
DESCRIPTION
These functions may be used to obtain explanations for errors returned by the
tcsendbreak(3) system call.
explain_tcsendbreak
const char *explain_tcsendbreak(int fildes, int duration);
The explain_tcsendbreak function is used to obtain an explanation of an error returned by
the tcsendbreak(3) system call. The least the message will contain is the value of
strerror(errno), 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.
fildes The original fildes, exactly as passed to the tcsendbreak(3) system call.
duration
The original duration, exactly as passed to the tcsendbreak(3) system call.
Returns:
The message explaining the error. This message buffer is shared by all libexplain
functions which do not supply a buffer in their argument list. This will be
overwritten by the next call to any libexplain function which shares this buffer,
including other threads.
Note: This function is not thread safe, because it shares a return buffer across all
threads, and many other functions in this library.
Example: This function is intended to be used in a fashion similar to the following
example:
if (tcsendbreak(fildes, duration) < 0)
{
fprintf(stderr, "%s\n", explain_tcsendbreak(fildes, duration));
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_tcsendbreak_or_die(3)
function.
explain_errno_tcsendbreak
const char *explain_errno_tcsendbreak(int errnum, int fildes, int duration);
The explain_errno_tcsendbreak function is used to obtain an explanation of an error
returned by the tcsendbreak(3) system call. The least the message will contain is the
value of strerror(errno), but usually it will do much better, and indicate the underlying
cause in more detail.
errnum The error value to be decoded, usually obtained from the errno global variable
just before this function is called. This is necessary if you need to call any
code between the system call to be explained and this function, because many libc
functions will alter the value of errno.
fildes The original fildes, exactly as passed to the tcsendbreak(3) system call.
duration
The original duration, exactly as passed to the tcsendbreak(3) system call.
Returns:
The message explaining the error. This message buffer is shared by all libexplain
functions which do not supply a buffer in their argument list. This will be
overwritten by the next call to any libexplain function which shares this buffer,
including other threads.
Note: This function is not thread safe, because it shares a return buffer across all
threads, and many other functions in this library.
Example: This function is intended to be used in a fashion similar to the following
example:
if (tcsendbreak(fildes, duration) < 0)
{
int err = errno;
fprintf(stderr, "%s\n", explain_errno_tcsendbreak(err, fildes, duration));
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_tcsendbreak_or_die(3)
function.
explain_message_tcsendbreak
void explain_message_tcsendbreak(char *message, int message_size, int fildes, int
duration);
The explain_message_tcsendbreak function is used to obtain an explanation of an error
returned by the tcsendbreak(3) system call. The least the message will contain is the
value of strerror(errno), 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.
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.
fildes The original fildes, exactly as passed to the tcsendbreak(3) system call.
duration
The original duration, exactly as passed to the tcsendbreak(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
if (tcsendbreak(fildes, duration) < 0)
{
char message[3000];
explain_message_tcsendbreak(message, sizeof(message), fildes, duration);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_tcsendbreak_or_die(3)
function.
explain_message_errno_tcsendbreak
void explain_message_errno_tcsendbreak(char *message, int message_size, int errnum, int
fildes, int duration);
The explain_message_errno_tcsendbreak function is used to obtain an explanation of an
error returned by the tcsendbreak(3) system call. The least the message will contain is
the value of strerror(errno), but usually it will do much better, and indicate the
underlying cause in more detail.
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.
errnum The error value to be decoded, usually obtained from the errno global variable
just before this function is called. This is necessary if you need to call any
code between the system call to be explained and this function, because many libc
functions will alter the value of errno.
fildes The original fildes, exactly as passed to the tcsendbreak(3) system call.
duration
The original duration, exactly as passed to the tcsendbreak(3) system call.
Example: This function is intended to be used in a fashion similar to the following
example:
if (tcsendbreak(fildes, duration) < 0)
{
int err = errno;
char message[3000];
explain_message_errno_tcsendbreak(message, sizeof(message), err, fildes,
duration);
fprintf(stderr, "%s\n", message);
exit(EXIT_FAILURE);
}
The above code example is available pre‐packaged as the explain_tcsendbreak_or_die(3)
function.
SEE ALSO
tcsendbreak(3)
send terminal line break
explain_tcsendbreak_or_die(3)
send terminal line break and report errors
COPYRIGHT
libexplain version 1.4
Copyright (C) 2009 Peter Miller
explain_tcsendbreak(3)