NAME
ttymsg —
ttymsg utility function
LIBRARY
library “libutil”
SYNOPSIS
#include
<util.h>
char *
ttymsg(struct
iovec *iov, int
iovlen, const char
*tty, int
tmout);
DESCRIPTION
Thettymsg()
function is used by programs such as
talkd(8),
syslogd(8), wall(1), etc., to display the contents of a uio structure on a
terminal. ttymsg() forks and finishes in the child if
the write would block after waiting up to tmout seconds.
RETURN VALUES
ttymsg() returns a pointer to an error
string on unexpected error; the string is not newline-terminated. Various
"normal" errors are ignored (exclusive-use, lack of permission,
etc.).
SEE ALSO
BUGS
ttymsg could grow some flags and a
username/uid who is the expected owner of the tty. If the flags say so then
the owner should be checked against the tty owner, and the message should
not be sent if there is a mismatch. Also another flag could say check
against group writable, and don't send a message.