Open System Services System Calls Reference Manual (G06.28+, H06.05+)

System Functions (s and S) spt_recvmsgx(2)
#define SPT_THREAD_AWARE_PRAGMA_NONBLOCK
When data is available, a call to the select() function indicates that the file descriptor for the
socket is ready for reading.
RETURN VALUES
Upon successful completion, the spt_recvmsgx() function returns the length of the received
message in bytes. If no data is available and the peer socket has performed an orderly shutdown,
0 (zero) is returned.
If the spt_recvmsgx() function call fails, the value -1 is returned, and errno is set to indicate the
error.
If the socket becomes invalid (is closed by another thread), -1 is returned with an errno value of
[EBADF]. If a signal is received via the pthread_kill() function and is not blocked, ignored, or
handled, -1 is returned with an errno value of [EINTR].
ERRORS
If any of these conditions occur, the spt_recvmsgx() function sets errno to the corresponding
value:
[EBADF] The socket parameter is not a valid file descriptor.
[ECONNRESET]
One of these conditions occurred:
— The transport-provider process for this socket is no longer avail-
able.
— The TCP/IP subsystem for this socket is no longer available.
— The connection was forcibly closed by the peer socket.
The socket can only be closed.
[EFAULT] A user-supplied memory buffer cannot be accessed or written.
[EINTR] A signal interrupted the function before any data was available.
[EINVAL] One of these conditions occurred:
— The MSG_OOB value is specified in the flags parameter, and no
out-of-band data is available.
— The sum of the values specified for the msg_iovlen field of the
msghdr structure is too large for a data item of type ssize_t.
— The socket belongs to the AF_INET or AF_INET6 domain, and
the function call requested msg_control data.
— The socket belongs to the AF_UNIX domain, and the size of
msg_controllen is less than the size of the cmsghdr structure
plus one file descriptor.
[EIO] An input or output error occurred.
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