Hi,
Sorry if this is explained somewhere already. I couldn't find an
answer, so here we go.
Considering the `print' function of libc, we see that it calls
`vfprint', which in turn calls `fmtFdFlush', which finally calls
`write' with 3 parameters.
write(2) says that the source is to be found in /sys/src/libc/
9syscall, but the mkfile in there defines `_write' which in turn does
nothing but push the value 20 on the accumulator and call the
interrupt 0x64.
a) Where is `write' actually defined? (Or does `write' simply call
`_write'?)
b) Why do some syscalls have `_' prefixes while others do not?
c) How are the parameters to the libc syscall wrapper passed onto the
actual kernel-side implementation?
Thank you for your time.
Cheers,
Anant
