I'm using https://filippo.io/linux-syscall-table/ Linux syscalls reference, but can't found recv and send functions here. What's syscall numbers for these functions?

recvfrom() and sendto() ?
64bit are right there
32bit are right here http://docs.cs.up.ac.za/programming/asm/derick_tut/syscalls.html

bdw if you need 64bit ones, i got a .inc for it, just ask

rbprsp, afaik if you don't need to specify flags (in recv/send) calls, you can use read/write calls.

gens, can recvfrom/sendto be used for TCP sockets (like recv/send)? Aren't they UDP only?

it seems to be documented like that
i didnt know that

there is no syscall number for it, so i did a little digging
"The recv() call is normally used only on a connected socket (see connect(2)) and is identical to recvfrom() with a NULL from parameter."

so i guess it's recvfrom() with last two parameters being null
(or just the "from", as then "fromlen" wouldnt be checked anyway)

Thanks, dear colleagues! I'll publish my syscall tests at this thread later.

Sorry for offtopic, but can anyone explain how to convert FAS symbols to gdb format?