SG_SET_TIMEOUT
The Linux SCSI Generic (sg) HOWTO
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8.19. SG_SET_TIMEOUT

SG_SET_TIMEOUT 0x2201. Assumes 3rd argument points to an int containing the new timeout value for this file descriptor. The unit is a "jiffy". Packets that are already "in flight" will not be affected. The default value is set on open() and is SG_DEFAULT_TIMEOUT (defined in sg.h). This default is currently 1 minute and may not be long enough for formats. Negative values will yield an EIO error. This ioctl() is not relevant to the sg version 3 driver because timeouts are specified explicitly for each command in the sg_io_hdr structure. Only when the sg_header structure is used is the timeout inherited from this value (help on a per file descriptor basis).

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