http://plan9.bell-labs.com/sources/plan9/sys/src/libc/9sys/writev.c http://plan9.bell-labs.com/sources/plan9/sys/src/libc/9sys/w... In other words, writev on p

http://plan9.bell-labs.com/sources/plan9/sys/src/libc/9sys/writev.c http://plan9.bell-labs.com/sources/plan9/sys/src/libc/9sys/w... In other words, writev on plan9 isn't a system call -- it does the same copying that echo.c does. Also, echo.c probably predates writev.c.