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Diffstat (limited to 'toys/pending/telnetd.c')
-rw-r--r--toys/pending/telnetd.c67
1 files changed, 31 insertions, 36 deletions
diff --git a/toys/pending/telnetd.c b/toys/pending/telnetd.c
index 115b3840..3c0f8e39 100644
--- a/toys/pending/telnetd.c
+++ b/toys/pending/telnetd.c
@@ -33,7 +33,6 @@ GLOBALS(
long w_sec;
int gmax_fd;
- int sig;
pid_t fork_pid;
)
@@ -110,7 +109,7 @@ static void get_sockaddr(char *host, void *buf)
else ((struct sockaddr_in6*)buf)->sin6_port = port_num;
}
-static void utmp_entry(void)
+static void utmp_entry(void)
{
struct utmp entry;
struct utmp *utp_ptr;
@@ -302,36 +301,6 @@ static int dup_iacs(char *start, int fd, int len)
return ret;
}
-static void kill_session(void)
-{
- int status;
- struct term_session *tm, *prev = NULL;
- pid_t pid = wait(&status);
- TT.sig = 0; //ASAP
-
- tm = session_list;
- if (toys.optflags & FLAG_i) exit(EXIT_SUCCESS);
-
- if (pid < 0) return;
- while (tm) {
- if (tm->child_pid == pid) break;
- prev = tm;
- tm = tm->next;
- }
- if (!tm) return; //paranoia
- if (!prev) session_list = session_list->next;
- else prev->next = tm->next;
- utmp_entry();
- xclose(tm->pty_fd);
- xclose(tm->new_fd);
- free(tm);
-}
-
-static void session_handler(int sig)
-{
- TT.sig = sig;
-}
-
void telnetd_main(void)
{
errno = 0;
@@ -339,9 +308,8 @@ void telnetd_main(void)
struct term_session *tm = NULL;
struct timeval tv, *tv_ptr = NULL;
int pty_fd, new_fd, c = 0, w, master_fd = 0;
- int inetd_m = (toys.optflags & FLAG_i);
+ int inetd_m = toys.optflags & FLAG_i;
- TT.sig = 0;
if (!(toys.optflags & FLAG_l)) TT.login_path = "/bin/login";
if (!(toys.optflags & FLAG_f)) TT.issue_path = "/etc/issue.net";
if (toys.optflags & FLAG_w) toys.optflags |= FLAG_F;
@@ -368,7 +336,7 @@ void telnetd_main(void)
tv.tv_usec = 0;
tv_ptr = &tv;
}
- signal(SIGCHLD, session_handler);
+ signal(SIGCHLD, generic_signal);
for (;;) {
FD_ZERO(&rd);
@@ -446,6 +414,33 @@ void telnetd_main(void)
tm->buff2_written = tm->buff2_avail = 0;
fflush(NULL);
}
- if (TT.sig) kill_session();
+
+ // Loop to handle (unknown number of) SIGCHLD notifications
+ while (toys.signal) {
+ int status;
+ struct term_session *prev = NULL;
+ pid_t pid;
+
+ // funny little dance to avoid race conditions.
+ toys.signal = 0;
+ pid = waitpid(-1, &status, WNOHANG);
+ if (pid < 0) break;
+ toys.signal++;
+
+
+ for (tm = session_list; tm; tm = tm->next) {
+ if (tm->child_pid == pid) break;
+ prev = tm;
+ }
+ if (!tm) return; // reparented child we don't care about
+
+ if (toys.optflags & FLAG_i) exit(EXIT_SUCCESS);
+ if (!prev) session_list = session_list->next;
+ else prev->next = tm->next;
+ utmp_entry();
+ xclose(tm->pty_fd);
+ xclose(tm->new_fd);
+ free(tm);
+ }
}
}