Blocking I/O calls in Linux

Question

Are all blocking I/O calls in Linux somehow wrapped around read() and write() (http://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html)?

My use case will then be to intercept these functions calls and execute code before and after them to count how I/O is utilized in a sample program.

Disk I/O, socket I/O, etc.. Basically any blocking I/O calls that a basic multithreaded server would make :) — Curious, Dec 28 '15 at 23:32
You should check the manual page for the write/read family of functions, however I'm not 100% certain that this covers all I/O calls. — SystemFun, Dec 29 '15 at 04:02

score 0 · Answer 1 · answered Feb 02 '18 at 15:03

Are all blocking I/O calls in Linux somehow wrapped around read() and write() (http://www.gnu.org/software/libc/manual/html_node/I_002fO-Primitives.html)?

No. Since you have in mind also socket I/O, cf. Transferring Data (from the same manual):

There are also some I/O modes that are specific to socket operations. In order to specify these modes, you must use the recv and send functions instead of the more generic read and write functions.

Blocking I/O calls in Linux

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