[Solved] What is this operation in C?

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Assuming ICANON is a bit-mask, i.e. an integer with bits set to represent some feature, that statement will make sure those bits are not set in c_lflag.

This is often called “masking off” those bits.

The operation is a bitwise AND with the bitwise inverse (~ is bitwise inverse).

So, if the value of c_lflag is 3 (binary 112) before the operation, and ICANON has the value 2 (binary 102), it will become 1 since it’s bitwise-AND:ed with the value ~2 which has all bits set except bit number 1 (binary …111012).

It could also be written more verbosely as

term.c_lflag = term.c_lflag & ~ICANON;

The parentheses around ICANON should not be needed.

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solved What is this operation in C?