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- (djm) [channels.c serverloop.c] Fix so-called "hang on exit" (bz #52)

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when closing a tty session when a background process still holds tty
   fds open. Great detective work and patch by Marc Aurele La France,
   slightly tweaked by me; ok dtucker@
This commit is contained in:
Damien Miller 2007-01-29 10:16:28 +11:00
parent 07877ca680
commit e42bd24b22
3 changed files with 29 additions and 9 deletions
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8
ChangeLog
View File

@ -1,3 +1,9 @@
20070128
- (djm) [channels.c serverloop.c] Fix so-called "hang on exit" (bz #52)
when closing a tty session when a background process still holds tty
fds open. Great detective work and patch by Marc Aurele La France,
slightly tweaked by me; ok dtucker@
20070123
- (dtucker) [openbsd-compat/bsd-snprintf.c] Static declarations for public
library interfaces aren't very helpful. Fix up the DOPR_OUTCH macro
@ -2686,4 +2692,4 @@
OpenServer 6 and add osr5bigcrypt support so when someone migrates
passwords between UnixWare and OpenServer they will still work. OK dtucker@
$Id: ChangeLog,v 1.4608 2007/01/23 13:07:29 dtucker Exp $
$Id: ChangeLog,v 1.4609 2007/01/28 23:16:28 djm Exp $

10
channels.c
View File

@ -1449,10 +1449,11 @@ channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
int len;
if (c->rfd != -1 &&
FD_ISSET(c->rfd, readset)) {
(c->detach_close || FD_ISSET(c->rfd, readset))) {
errno = 0;
len = read(c->rfd, buf, sizeof(buf));
if (len < 0 && (errno == EINTR || errno == EAGAIN))
if (len < 0 && (errno == EINTR ||
(errno == EAGAIN && !(c->isatty && c->detach_close))))
return 1;
#ifndef PTY_ZEROREAD
if (len <= 0) {
@ -1604,11 +1605,12 @@ channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
c->local_consumed += len;
}
} else if (c->extended_usage == CHAN_EXTENDED_READ &&
FD_ISSET(c->efd, readset)) {
(c->detach_close || FD_ISSET(c->efd, readset))) {
len = read(c->efd, buf, sizeof(buf));
debug2("channel %d: read %d from efd %d",
c->self, len, c->efd);
if (len < 0 && (errno == EINTR || errno == EAGAIN))
if (len < 0 && (errno == EINTR ||
(errno == EAGAIN && !c->detach_close)))
return 1;
if (len <= 0) {
debug2("channel %d: closing read-efd %d",

20
serverloop.c
View File

@ -280,6 +280,7 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
struct timeval tv, *tvp;
int ret;
int client_alive_scheduled = 0;
int program_alive_scheduled = 0;
/*
* if using client_alive, set the max timeout accordingly,
@ -317,6 +318,7 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
* the client, try to get some more data from the program.
*/
if (packet_not_very_much_data_to_write()) {
program_alive_scheduled = child_terminated;
if (!fdout_eof)
FD_SET(fdout, *readsetp);
if (!fderr_eof)
@ -362,8 +364,16 @@ wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
memset(*writesetp, 0, *nallocp);
if (errno != EINTR)
error("select: %.100s", strerror(errno));
} else if (ret == 0 && client_alive_scheduled)
client_alive_check();
} else {
if (ret == 0 && client_alive_scheduled)
client_alive_check();
if (!compat20 && program_alive_scheduled && fdin_is_tty) {
if (!fdout_eof)
FD_SET(fdout, *readsetp);
if (!fderr_eof)
FD_SET(fderr, *readsetp);
}
}
notify_done(*readsetp);
}
@ -407,7 +417,8 @@ process_input(fd_set *readset)
if (!fdout_eof && FD_ISSET(fdout, readset)) {
errno = 0;
len = read(fdout, buf, sizeof(buf));
if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
if (len < 0 && (errno == EINTR ||
(errno == EAGAIN && !child_terminated))) {
/* do nothing */
#ifndef PTY_ZEROREAD
} else if (len <= 0) {
@ -425,7 +436,8 @@ process_input(fd_set *readset)
if (!fderr_eof && FD_ISSET(fderr, readset)) {
errno = 0;
len = read(fderr, buf, sizeof(buf));
if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
if (len < 0 && (errno == EINTR ||
(errno == EAGAIN && !child_terminated))) {
/* do nothing */
#ifndef PTY_ZEROREAD
} else if (len <= 0) {