diff options
Diffstat (limited to 'debian/patches/gpg-agent-idling/agent-Create-framework-of-scheduled-timers.patch')
| -rw-r--r-- | debian/patches/gpg-agent-idling/agent-Create-framework-of-scheduled-timers.patch | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/debian/patches/gpg-agent-idling/agent-Create-framework-of-scheduled-timers.patch b/debian/patches/gpg-agent-idling/agent-Create-framework-of-scheduled-timers.patch new file mode 100644 index 0000000..5b6e1ff --- /dev/null +++ b/debian/patches/gpg-agent-idling/agent-Create-framework-of-scheduled-timers.patch @@ -0,0 +1,191 @@ +From: Daniel Kahn Gillmor <dkg@fifthhorseman.net> +Date: Mon, 31 Oct 2016 21:27:36 -0400 +Subject: agent: Create framework of scheduled timers. + +agent/gpg-agent.c (handle_tick): Remove intermittent call to +check_own_socket. +(tv_is_set): Add inline helper function for readability. +(handle_connections) Create general table of pending scheduled +timeouts. + +-- + +handle_tick() does fine-grained, rapid activity. check_own_socket() +is supposed to happen at a different interval. + +Mixing the two of them makes it a requirement that one interval be a +multiple of the other, which isn't ideal if there are different delay +strategies that we might want in the future. + +Creating an extensible regular timer framework in handle_connections +should make it possible to have any number of cadenced timers fire +regularly, without requiring that they happen in cadences related to +each other. + +It should also make it possible to dynamically change the cadence of +any regularly-scheduled timeout. + +Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net> +--- + agent/gpg-agent.c | 84 +++++++++++++++++++++++++++++++++++++------------------ + 1 file changed, 57 insertions(+), 27 deletions(-) + +diff --git a/agent/gpg-agent.c b/agent/gpg-agent.c +index 3f7aaae..309e87c 100644 +--- a/agent/gpg-agent.c ++++ b/agent/gpg-agent.c +@@ -2377,12 +2377,8 @@ create_directories (void) + static void + handle_tick (void) + { +- static time_t last_minute; + struct stat statbuf; + +- if (!last_minute) +- last_minute = time (NULL); +- + /* Check whether the scdaemon has died and cleanup in this case. */ + agent_scd_check_aliveness (); + +@@ -2402,15 +2398,6 @@ handle_tick (void) + } + #endif /*HAVE_W32_SYSTEM*/ + +- /* Code to be run from time to time. */ +-#if CHECK_OWN_SOCKET_INTERVAL > 0 +- if (last_minute + CHECK_OWN_SOCKET_INTERVAL <= time (NULL)) +- { +- check_own_socket (); +- last_minute = time (NULL); +- } +-#endif +- + /* Need to check for expired cache entries. */ + agent_cache_housekeeping (); + +@@ -2821,6 +2808,15 @@ start_connection_thread_ssh (void *arg) + } + + ++/* helper function for readability: test whether a given struct ++ timespec is set to all-zeros */ ++static inline int ++tv_is_set (struct timespec tv) ++{ ++ return tv.tv_sec || tv.tv_nsec; ++} ++ ++ + /* Connection handler loop. Wait for connection requests and spawn a + thread after accepting a connection. */ + static void +@@ -2838,9 +2834,11 @@ handle_connections (gnupg_fd_t listen_fd, + gnupg_fd_t fd; + int nfd; + int saved_errno; ++ int idx; + struct timespec abstime; + struct timespec curtime; + struct timespec timeout; ++ struct timespec *select_timeout; + #ifdef HAVE_W32_SYSTEM + HANDLE events[2]; + unsigned int events_set; +@@ -2857,6 +2855,14 @@ handle_connections (gnupg_fd_t listen_fd, + { "browser", start_connection_thread_browser }, + { "ssh", start_connection_thread_ssh } + }; ++ struct { ++ struct timespec interval; ++ void (*func) (void); ++ struct timespec next; ++ } timertbl[] = { ++ { { TIMERTICK_INTERVAL, 0 }, handle_tick }, ++ { { CHECK_OWN_SOCKET_INTERVAL, 0 }, check_own_socket } ++ }; + + + ret = npth_attr_init(&tattr); +@@ -2964,9 +2970,6 @@ handle_connections (gnupg_fd_t listen_fd, + listentbl[2].l_fd = listen_fd_browser; + listentbl[3].l_fd = listen_fd_ssh; + +- npth_clock_gettime (&abstime); +- abstime.tv_sec += TIMERTICK_INTERVAL; +- + for (;;) + { + /* Shutdown test. */ +@@ -3001,18 +3004,46 @@ handle_connections (gnupg_fd_t listen_fd, + thus a simple assignment is fine to copy the entire set. */ + read_fdset = fdset; + ++ /* loop through all timers, fire any registered functions, and ++ plan next timer to trigger */ + npth_clock_gettime (&curtime); +- if (!(npth_timercmp (&curtime, &abstime, <))) +- { +- /* Timeout. */ +- handle_tick (); +- npth_clock_gettime (&abstime); +- abstime.tv_sec += TIMERTICK_INTERVAL; +- } +- npth_timersub (&abstime, &curtime, &timeout); ++ abstime.tv_sec = abstime.tv_nsec = 0; ++ for (idx=0; idx < DIM(timertbl); idx++) ++ { ++ /* schedule any unscheduled timers */ ++ if ((!tv_is_set (timertbl[idx].next)) && tv_is_set (timertbl[idx].interval)) ++ npth_timeradd (&timertbl[idx].interval, &curtime, &timertbl[idx].next); ++ /* if a timer is due, fire it ... */ ++ if (tv_is_set (timertbl[idx].next)) ++ { ++ if (!(npth_timercmp (&curtime, &timertbl[idx].next, <))) ++ { ++ timertbl[idx].func (); ++ npth_clock_gettime (&curtime); ++ /* ...and reschedule it, if desired: */ ++ if (tv_is_set (timertbl[idx].interval)) ++ npth_timeradd (&timertbl[idx].interval, &curtime, &timertbl[idx].next); ++ else ++ timertbl[idx].next.tv_sec = timertbl[idx].next.tv_nsec = 0; ++ } ++ } ++ /* accumulate next timer to come due in abstime: */ ++ if (tv_is_set (timertbl[idx].next) && ++ ((!tv_is_set (abstime)) || ++ (npth_timercmp (&abstime, &timertbl[idx].next, >)))) ++ abstime = timertbl[idx].next; ++ } ++ /* choose a timeout for the select loop: */ ++ if (tv_is_set (abstime)) ++ { ++ npth_timersub (&abstime, &curtime, &timeout); ++ select_timeout = &timeout; ++ } ++ else ++ select_timeout = NULL; + + #ifndef HAVE_W32_SYSTEM +- ret = npth_pselect (nfd+1, &read_fdset, NULL, NULL, &timeout, ++ ret = npth_pselect (nfd+1, &read_fdset, NULL, NULL, select_timeout, + npth_sigev_sigmask ()); + saved_errno = errno; + +@@ -3022,7 +3053,7 @@ handle_connections (gnupg_fd_t listen_fd, + handle_signal (signo); + } + #else +- ret = npth_eselect (nfd+1, &read_fdset, NULL, NULL, &timeout, ++ ret = npth_eselect (nfd+1, &read_fdset, NULL, NULL, select_timeout, + events, &events_set); + saved_errno = errno; + +@@ -3067,7 +3098,6 @@ handle_connections (gnupg_fd_t listen_fd, + + if (!shutdown_pending) + { +- int idx; + ctrl_t ctrl; + npth_t thread; + |