/*
* Wall function.
*/
void wall(const char *text, int remote)
{
FILE *tp;
struct sigaction sa;
struct utmp *utmp;
time_t t;
char term[UT_LINESIZE+ strlen(_PATH_DEV) + 1];
char line[81];
char hostname[HOST_NAME_MAX+1];
char *date, *p;
char *user, *tty;
int fd, flags;
/*
* Make sure tp and fd aren't in a register. Some versions
* of gcc clobber those after longjmp (or so I understand).
*/
(void) &tp;
(void) &fd;
getuidtty(&user, &tty);
/* Get and report current hostname, to make it easier to find
out which machine is being shut down. */
if (0 != gethostname(hostname, sizeof(hostname))) {
strncpy(hostname, "[unknown]", sizeof(hostname)-1);
}
/* If hostname is truncated, it is unspecified if the string
is null terminated or not. Make sure we know it is null
terminated. */
hostname[sizeof(hostname)-1] = 0;
/* Get the time */
time(&t);
date = ctime(&t);
for(p = date; *p && *p != '\n'; p++)
;
*p = 0;
if (remote) {
snprintf(line, sizeof(line),
"\007\r\nRemote broadcast message (%s):\r\n\r\n",
date);
} else {
snprintf(line, sizeof(line),
"\007\r\nBroadcast message from %s@%s %s(%s):\r\n\r\n",
user, hostname, tty, date);
}
/*
* Fork to avoid us hanging in a write()
*/
if (fork() != 0)
return;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGALRM, &sa, NULL);
setutent();
while ((utmp = getutent()) != NULL) {
if(utmp->ut_type != USER_PROCESS ||
utmp->ut_user[0] == 0) continue;
if (strncmp(utmp->ut_line, _PATH_DEV, strlen(_PATH_DEV)) == 0) {
term[0] = 0;
strncat(term, utmp->ut_line, sizeof(term)-1);
} else
snprintf(term, sizeof(term), _PATH_DEV "%.*s",
UT_LINESIZE, utmp->ut_line);
if (strstr(term, "/../")) continue;
fd = -1;
tp = NULL;
/*
* Open it non-delay
*/
if (sigsetjmp(jbuf, 1) == 0) {
alarm(2);
flags = O_WRONLY|O_NDELAY|O_NOCTTY;
if (file_isatty(term) &&
(fd = open(term, flags)) >= 0) {
if (isatty(fd) &&
(tp = fdopen(fd, "w")) != NULL) {
fputs(line, tp);
feputs(text, tp);
fflush(tp);
}
}
}
alarm(0);
if (fd >= 0) close(fd);
if (tp != NULL) fclose(tp);
}
endutent();
exit(0);
}
/*
* Wall function.
*/
void wall(char *text, int fromshutdown, int remote)
{
FILE *tp;
struct sigaction sa;
struct utmp *utmp;
time_t t;
char term[UT_LINESIZE+6];
char line[81];
char *date, *p;
char *user, *tty;
int fd, flags;
/*
* Make sure tp and fd aren't in a register. Some versions
* of gcc clobber those after longjmp (or so I understand).
*/
(void) &tp;
(void) &fd;
getuidtty(&user, &tty);
/* Get the time */
time(&t);
date = ctime(&t);
for(p = date; *p && *p != '\n'; p++)
;
*p = 0;
if (remote) {
snprintf(line, sizeof(line),
"\007\r\nRemote broadcast message (%s):\r\n\r\n",
date);
} else {
snprintf(line, sizeof(line),
"\007\r\nBroadcast message from %s %s(%s):\r\n\r\n",
user, tty, date);
}
/*
* Fork to avoid us hanging in a write()
*/
if (fork() != 0)
return;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGALRM, &sa, NULL);
setutent();
while ((utmp = getutent()) != NULL) {
if(utmp->ut_type != USER_PROCESS ||
utmp->ut_user[0] == 0) continue;
if (strncmp(utmp->ut_line, "/dev/", 5) == 0) {
term[0] = 0;
strncat(term, utmp->ut_line, UT_LINESIZE);
} else
snprintf(term, sizeof(term), "/dev/%.*s",
UT_LINESIZE, utmp->ut_line);
if (strstr(term, "/../")) continue;
fd = -1;
tp = NULL;
/*
* Open it non-delay
*/
if (sigsetjmp(jbuf, 1) == 0) {
alarm(2);
flags = O_WRONLY|O_NDELAY|O_NOCTTY;
if (file_isatty(term) &&
(fd = open(term, flags)) >= 0) {
if (isatty(fd) &&
(tp = fdopen(fd, "w")) != NULL) {
fputs(line, tp);
feputs(text, tp);
fflush(tp);
}
}
}
alarm(0);
if (fd >= 0) close(fd);
if (tp != NULL) fclose(tp);
}
endutent();
exit(0);
}
