Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

put_fd_write_ready(2) OSS System Calls Reference Manual
[EINTR] A signal was received via pthread_kill() and is not blocked, ignored, or han-
dled.
[EINVAL] Invalid function argument.
[EBADF] File descriptor was not open for writing or was closed while being waited on.
[ENOTSUP] Operation was not supported on file descriptor.
[ETIMEDOUT]
timeout has occurred.
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