setsockopt SOCKET,LEVEL,OPTNAME,OPTVAL Sets the socket option requested. Returns undef on error. Use integer constants provided by the Socket module for LEVEL and OPNAME. Values for LEVEL can also be obtained from getprotobyname. OPTVAL might either be a packed string or an integer. An integer OPTVAL is shorthand for pack("i", OPTVAL). An example disabling Nagle's algorithm on a socket: use Socket qw(IPPROTO_TCP TCP_NODELAY); setsockopt($socket, IPPROTO_TCP, TCP_NODELAY, 1); Portability issues

setservent STAYOPEN

setpwent

setprotoent STAYOPEN

setpriority WHICH,WHO,PRIORITY Sets the current priority for a process, a process group, or a user. (See setpriority(2).) Raises an exception when used on a machine that doesn't implement setpriority(2). Portability issues: setpriority in perlport.

setpgrp PID,PGRP Sets the current process group for the specified PID, 0 for the current process. Raises an exception when used on a machine that doesn't implement POSIX setpgid(2) or BSD setpgrp(2). If the arguments are omitted, it defaults to 0,0 . Note that the BSD 4.2 version of setpgrp does not accept any arguments, so only setpgrp(0,0) is portable. See also POSIX::setsid() . Portability issues: setpgrp in perlport.

setnetent STAYOPEN

sethostent STAYOPEN

setgrent

send SOCKET,MSG,FLAGS,TO send SOCKET,MSG,FLAGS Sends a message on a socket. Attempts to send the scalar MSG to the SOCKET filehandle. Takes the same flags as the system call of the same name. On unconnected sockets, you must specify a destination to send to, in which case it does a sendto(2) syscall. Returns the number of characters sent, or the undefined value on error. The sendmsg(2) syscall is currently unimplemented. See UDP: Message Passing in perlipc for examples. Note the characters: dep