t_rcvuderr(3xti)
Name
t_rcvuderr − receive a unit error indication
Syntax
#include <xti.h>
int t_rcvuderr(fd, uderr)
int fd;
struct t_uderr *uderr;
Arguments
fdIdentifies the local transport endpoint through which the error report is received.
uderrPoints to a t_uderr structure containing the following members:
struct netbuf addr;
struct netbuf opt;
long error;
On return from this call, the members have the following meanings:
addrSpecifies the destination protocol address of the erroneous data unit.
optIdentifies protocol-specific options that were associated with the data unit.
errorSpecifies a protocol-dependent error code.
Description
This function is used in connectionless mode to receive information concerning an error on a previously sent data unit and should be issued following a unit data error indication. It informs the transport user that a data unit with a specific destination address and protocol options produced an error.
The maxlen field of addr and opt must be set before issuing this function to indicate the maximum size of the buffer for each.
If the user does not care to identify the data unit that produced an error, uderr may be set to NULL, and t_rcvuderr() simply clears the error indication without reporting any information to the user.
| Parameters | Before Call | After Call |
| fd | x | / |
| uderr->addr.maxlen | x | / |
| uderr->addr.len | / | x |
| uderr->addr.buf | x | (x) |
| uderr->opt.maxlen | x | / |
| uderr->opt.len | / | x |
| uderr->opt.buf | x | (x) |
| uderr->error | / | x |
Return Values
Upon successful completion, a value of 0 is returned. On failure, a value of −1 is returned, and t_errno is set to indicate the error.
Diagnostics
On failure, t_errno is set to one of the following:
[BADF] The specified file descriptor does not refer to a transport endpoint.
[TNOUDERR] No unit data error indication currently exists on the specified transport endpoint.
[TBUFOVFLW] The number of bytes allocated for the incoming protocol address or options is not sufficient to store the information. The unit data error information to be returned in uderr will be discarded.
[TNOTSUPPORT] This function is not supported by the underlying transport provider.
[TSYSERR] A system error has occurred during execution of this function.