157 lines
2.4 KiB
HTML
157 lines
2.4 KiB
HTML
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>SG_SET_FORCE_PACK_ID</TITLE
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NAME="S_PACKID">8.11. SG_SET_FORCE_PACK_ID</H1
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>SG_SET_FORCE_PACK_ID 0x227b. </B
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>Assumes 3rd argument is pointing to an int. 0 (default) instructs read()
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to return the oldest (written) packet if multiple packets are
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waiting to be read. 1 instructs read() to view the sg_io_hdr::pack_id
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(or sg_header::pack_id) as input and return the oldest packet matching
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that pack_id or wait until it arrives. If the file descriptor is in
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O_NONBLOCK state, rather than wait this ioctl() will yield EAGAIN.
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As a special case the pack_id of -1
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given to read() in the mode will match the oldest packet.
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Only the current file descriptor is affected by this command.</P
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