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.\" -*- nroff -*- .\" .TH UMAD_POLL 3 "October 23, 2007" "OpenIB" "OpenIB Programmer\'s Manual" .SH "NAME" umad_poll \- poll umad .SH "SYNOPSIS" .nf .B #include <infiniband/umad.h> .sp .BI "int umad_poll(int " "portid" ", int " "timeout_ms"); .fi .SH "DESCRIPTION" .B umad_poll() waits up to .I timeout_ms\fR milliseconds for a packet to be received from the port specified by .I portid\fR. Once a packet is ready to be read, the function returns 0. After that the packet can be read using .B umad_recv(). Otherwise, \-ETIMEDOUT is returned. Note that successfully polling a port does not guarantee that the subsequent .B umad_recv() will be non blocking when several threads are using the same port. Instead, use a .I timeout_ms\fR parameter of zero to .B umad_recv() to ensure a non-blocking read. .SH "RETURN VALUE" .B umad_poll() returns 0 on success, and a negative value on error as follows: -EINVAL invalid port handle or agentid -ETIMEDOUT poll operation timed out -EIO poll operation failed .SH "SEE ALSO" .BR umad_recv (3) .SH "AUTHOR" .TP Hal Rosenstock <halr@voltaire.com>