void
extstart(void)
{
#ifndef NOFIFO
char *disp;
char *user;
int fd;
int flags;
user = getuser();
disp = getenv("DISPLAY");
if (disp) {
exname = (char *)alloc(4 + 6 + strlen(user) + 1 + strlen(disp) + 1);
sprint(exname, "/tmp/.sam.%s.%s", user, disp);
} else {
exname = (char *)alloc(4 + 6 + strlen(user) + 1);
sprint(exname, "/tmp/.sam.%s", user);
}
/* Make the named pipe. Multiple sams with the same user/display share the same pipe */
if (mkfifo(exname, 0600) == -1) {
struct stat statb;
extern int errno;
if (errno != EEXIST || stat(exname, &statb) == -1)
return;
if (!S_ISFIFO(statb.st_mode)) {
removeextern();
if (mkfifo(exname, 0600) == -1)
return;
}
}
fd = open(exname, O_RDONLY | O_NONBLOCK);
if (fd == -1) {
removeextern();
return;
}
/*
* Turn off no-delay and provide ourselves as a lingering
* writer so as not to get end of file on read.
*/
flags = fcntl(fd, F_GETFL, 0);
if (flags == -1 || fcntl(fd, F_SETFL, flags & ~O_NONBLOCK) == -1
|| open(exname, O_WRONLY) == -1) {
(void)close(fd);
removeextern();
return;
}
estart(Eextern, fd, 8192);
atexit(removeextern);
#endif
}
void
extstart(void)
{
char *user, *disp;
int fd, flags;
static void *arg[2];
user = getenv("USER");
if(user == nil)
return;
disp = getenv("DISPLAY");
if(disp)
exname = smprint("/tmp/.sam.%s.%s", user, disp);
else
exname = smprint("/tmp/.sam.%s", user);
if(exname == nil){
fprint(2, "not posting for B: out of memory\n");
return;
}
if(mkfifo(exname, 0600) < 0){
struct stat st;
if(errno != EEXIST || stat(exname, &st) < 0)
return;
if(!S_ISFIFO(st.st_mode)){
removeextern();
if(mkfifo(exname, 0600) < 0)
return;
}
}
fd = open(exname, OREAD|ONONBLOCK);
if(fd == -1){
removeextern();
return;
}
/*
* Turn off no-delay and provide ourselves as a lingering
* writer so as not to get end of file on read.
*/
flags = fcntl(fd, F_GETFL, 0);
if(flags<0 || fcntl(fd, F_SETFL, flags&~O_NONBLOCK)<0
||open(exname, OWRITE) < 0){
close(fd);
removeextern();
return;
}
plumbc = chancreate(sizeof(int), 0);
chansetname(plumbc, "plumbc");
arg[0] = plumbc;
arg[1] = (void*)(uintptr)fd;
proccreate(extproc, arg, STACK);
atexit(removeextern);
}
