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int ioctl ( int  desc,
int  request,
void *  arg 
)

Manipulates device parameters of special files.

Parameters:
desc The file descriptor
request The device-dependent request code.
arg An untyped pointer to memory used to convey request information.
Returns:
Ioctl usually returns zero on success. Some requests return positive values. On failure, it returns -1 and sets errno appropriately.


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