priod: PoC skeleton
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cca674789b
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B715679E3A361BE6
@ -48,6 +48,9 @@ target_link_libraries (input-switch ${project_libraries})
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add_executable (fancontrol-ng fancontrol-ng.c)
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target_link_libraries (fancontrol-ng ${project_libraries})
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add_executable (priod priod.c)
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target_link_libraries (priod ${project_libraries})
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if (WITH_GDM)
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include_directories (${gdm_INCLUDE_DIRS})
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add_executable (gdm-switch-user gdm-switch-user.c)
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@ -75,11 +78,13 @@ install (FILES ${PROJECT_BINARY_DIR}/fancontrol-ng.service
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install (FILES fancontrol-ng.conf.example
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DESTINATION ${CMAKE_INSTALL_DATADIR}/fancontrol-ng)
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# TODO: priod is also going to need a systemd unit file
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if (WITH_GDM)
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install (TARGETS gdm-switch-user DESTINATION ${CMAKE_INSTALL_BINDIR})
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endif (WITH_GDM)
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install (TARGETS wmstatus brightness input-switch fancontrol-ng siprandom
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install (TARGETS wmstatus brightness input-switch fancontrol-ng priod siprandom
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DESTINATION ${CMAKE_INSTALL_BINDIR})
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install (PROGRAMS shellify DESTINATION ${CMAKE_INSTALL_BINDIR})
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install (FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
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10
README.adoc
10
README.adoc
@ -5,14 +5,16 @@ desktop-tools
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'desktop-tools' is a collection of tools to run my desktop that might be useful
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to other people as well:
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- 'wmstatus' does literally everything my dwm doesn't but I'd like it to. It
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- 'wmstatus' does literally everything my i3 doesn't but I'd like it to. It
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includes PulseAudio volume management and hand-written NUT and MPD clients,
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all in the name of liberation from GPL-licensed software of course.
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- 'brightness' allows me to change the brightness of w/e display device I have.
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- 'input-switch' likewise switches the input source of external displays.
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all in the name of liberation from GPL-licensed software of course
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- 'brightness' allows me to change the brightness of w/e display device I have
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- 'input-switch' likewise switches the input source of external displays
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- 'fancontrol-ng' is a clone of fancontrol that can handle errors on resume
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from suspend instead of setting fans to maximum speed and quitting;
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in general it doesn't handle everything the original does
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- 'priod' sets CPU, I/O and OOM killer priorities for new processes according
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to configuration
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- 'shellify' is a simple script that sets up a shell for commands like vgdb
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and nmcli that are painfully lacking it
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- 'gdm-switch-user' tells the running GDM daemon, if any, to show the switch
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335
priod.c
Normal file
335
priod.c
Normal file
@ -0,0 +1,335 @@
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/*
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* priod.c: process reprioritizing daemon
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*
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* Thanks to http://netsplit.com/the-proc-connector-and-socket-filters
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*
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* Copyright (c) 2017, Přemysl Janouch <p.janouch@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#define _GNU_SOURCE
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#define LIBERTY_WANT_POLLER
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#include "config.h"
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#undef PROGRAM_NAME
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#define PROGRAM_NAME "priod"
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#include "liberty/liberty.c"
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#include <linux/cn_proc.h>
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#include <linux/netlink.h>
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#include <linux/connector.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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// --- Main program ------------------------------------------------------------
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struct app_context
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{
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struct poller poller; ///< Poller
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bool polling; ///< The event loop is running
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int proc_fd; ///< Proc connector FD
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struct poller_fd proc_event; ///< Proc connector read event
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};
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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static void
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log_message_custom (void *user_data, const char *quote, const char *fmt,
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va_list ap)
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{
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(void) user_data;
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FILE *stream = stdout;
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// TODO: sd-daemon.h log level prefixes?
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fputs (quote, stream);
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vfprintf (stream, fmt, ap);
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fputs ("\n", stream);
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}
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// --- Signals -----------------------------------------------------------------
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static int g_signal_pipe[2]; ///< A pipe used to signal... signals
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static void
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sigterm_handler (int signum)
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{
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(void) signum;
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int original_errno = errno;
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if (write (g_signal_pipe[1], "", 1) == -1)
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soft_assert (errno == EAGAIN);
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errno = original_errno;
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}
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static void
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setup_signal_handlers (void)
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{
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if (pipe (g_signal_pipe) == -1)
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exit_fatal ("%s: %s", "pipe", strerror (errno));
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set_cloexec (g_signal_pipe[0]);
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set_cloexec (g_signal_pipe[1]);
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// So that the pipe cannot overflow; it would make write() block within
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// the signal handler, which is something we really don't want to happen.
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// The same holds true for read().
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set_blocking (g_signal_pipe[0], false);
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set_blocking (g_signal_pipe[1], false);
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(void) signal (SIGPIPE, SIG_IGN);
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struct sigaction sa;
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sa.sa_flags = SA_RESTART;
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sa.sa_handler = sigterm_handler;
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sigemptyset (&sa.sa_mask);
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if (sigaction (SIGINT, &sa, NULL) == -1
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|| sigaction (SIGTERM, &sa, NULL) == -1)
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exit_fatal ("sigaction: %s", strerror (errno));
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}
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// --- Main program ------------------------------------------------------------
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// IO priorities are a sort-of-private kernel API with no proper headers
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enum
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{
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IOPRIO_CLASS_NONE,
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IOPRIO_CLASS_RT,
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IOPRIO_CLASS_BE,
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IOPRIO_CLASS_IDLE,
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};
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enum
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{
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IOPRIO_WHO_PROCESS = 1,
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IOPRIO_WHO_PGRP,
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IOPRIO_WHO_USER,
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};
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#define IOPRIO_CLASS_SHIFT 13
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static void
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on_exec_name (struct app_context *ctx, int pid, const char *name)
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{
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print_status ("exec %d %s", pid, name);
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if (true)
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return;
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setpriority (PRIO_PROCESS, pid, 0 /* TODO -20..20 */);
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// TODO: this is per thread, and there's an inherent race condition;
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// keep going through /proc/%d/task and reprioritize all threads;
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// stop trying after N-th try
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syscall (SYS_ioprio_set, IOPRIO_WHO_PROCESS,
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IOPRIO_CLASS_BE << IOPRIO_CLASS_SHIFT | 0 /* TODO 0..7 */);
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char *path = xstrdup_printf ("/proc/%d/oom_score_adj", pid);
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struct error *e = NULL;
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// TODO: figure out the contents
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if (!write_file (path, "", 0, &e))
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{
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print_error ("%s", e->message);
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error_free (e);
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}
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free (path);
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}
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static void
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on_exec (struct app_context *ctx, int pid)
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{
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char *path = xstrdup_printf ("/proc/%d/cmdline", pid);
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struct str cmdline;
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str_init (&cmdline);
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struct error *e = NULL;
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if (read_file (path, &cmdline, &e))
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on_exec_name (ctx, pid, cmdline.str);
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else
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{
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print_debug ("%s", e->message);
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error_free (e);
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}
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free (path);
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str_free (&cmdline);
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}
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static void
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on_netlink_message (struct app_context *ctx, struct nlmsghdr *mh)
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{
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if (mh->nlmsg_type == NLMSG_ERROR
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|| mh->nlmsg_type == NLMSG_NOOP)
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return;
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struct cn_msg *m = NLMSG_DATA (mh);
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if (m->id.idx != CN_IDX_PROC
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|| m->id.val != CN_VAL_PROC)
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return;
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struct proc_event *e = (struct proc_event *) m->data;
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if (e->what == PROC_EVENT_EXEC)
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on_exec (ctx, e->event_data.exit.process_tgid);
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}
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static void
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on_event (const struct pollfd *pfd, struct app_context *ctx)
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{
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char buf[4096];
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struct sockaddr_nl addr;
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while (true)
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{
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socklen_t addr_len = sizeof addr;
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ssize_t len = recvfrom (pfd->fd, buf, sizeof buf, 0,
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(struct sockaddr *) &addr, &addr_len);
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if (len == 0)
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exit_fatal ("socket closed");
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if (len < 0 && errno == EAGAIN)
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return;
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if (len < 0)
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exit_fatal ("recvfrom: %s", strerror (errno));
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// Make sure it comes from the kernel
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if (addr.nl_pid)
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continue;
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for (struct nlmsghdr *mh = (struct nlmsghdr *) buf;
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NLMSG_OK (mh, len); mh = NLMSG_NEXT (mh, len))
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on_netlink_message (ctx, mh);
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}
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}
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static void
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on_signal_pipe_readable (const struct pollfd *fd, struct app_context *ctx)
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{
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char id = 0;
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(void) read (fd->fd, &id, 1);
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ctx->polling = false;
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}
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static const char *
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parse_program_arguments (int argc, char **argv)
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{
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static const struct opt opts[] =
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{
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{ 'd', "debug", NULL, 0, "run in debug mode" },
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{ 'h', "help", NULL, 0, "display this help and exit" },
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{ 'V', "version", NULL, 0, "output version information and exit" },
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{ 0, NULL, NULL, 0, NULL }
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};
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struct opt_handler oh;
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opt_handler_init (&oh, argc, argv, opts, "CONFIG", "Fan controller.");
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int c;
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while ((c = opt_handler_get (&oh)) != -1)
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switch (c)
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{
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case 'd':
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g_debug_mode = true;
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break;
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case 'h':
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opt_handler_usage (&oh, stdout);
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exit (EXIT_SUCCESS);
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case 'V':
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printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
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exit (EXIT_SUCCESS);
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default:
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print_error ("wrong options");
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opt_handler_usage (&oh, stderr);
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exit (EXIT_FAILURE);
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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{
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opt_handler_usage (&oh, stderr);
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exit (EXIT_FAILURE);
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}
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opt_handler_free (&oh);
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return argv[0];
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}
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int
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main (int argc, char *argv[])
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{
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g_log_message_real = log_message_custom;
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const char *config_path = parse_program_arguments (argc, argv);
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struct app_context ctx;
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memset (&ctx, 0, sizeof ctx);
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poller_init (&ctx.poller);
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setup_signal_handlers ();
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struct poller_fd signal_event;
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poller_fd_init (&signal_event, &ctx.poller, g_signal_pipe[0]);
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signal_event.dispatcher = (poller_fd_fn) on_signal_pipe_readable;
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signal_event.user_data = &ctx;
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poller_fd_set (&signal_event, POLLIN);
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// TODO: load configuration so that we know what to do with the events
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ctx.proc_fd = socket (PF_NETLINK,
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SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, NETLINK_CONNECTOR);
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if (ctx.proc_fd < 0)
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exit_fatal ("cannot make a proc connector: %s", strerror (errno));
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struct sockaddr_nl addr = { .nl_family = AF_NETLINK, .nl_pid = getpid (),
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.nl_groups = CN_IDX_PROC };
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if (bind (ctx.proc_fd, (struct sockaddr *) &addr, sizeof addr) < 0)
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exit_fatal ("cannot make a proc connector: %s", strerror (errno));
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struct
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{
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// Beware of padding between fields, shouldn't be any on x86-64
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union { struct nlmsghdr netlink; char align[NLMSG_HDRLEN]; };
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struct cn_msg connector;
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enum proc_cn_mcast_op op;
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}
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subscription =
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{
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.netlink.nlmsg_len = sizeof subscription,
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.netlink.nlmsg_type = NLMSG_DONE,
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.netlink.nlmsg_pid = getpid (),
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.connector.id.idx = CN_IDX_PROC,
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.connector.id.val = CN_VAL_PROC,
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.connector.len = sizeof subscription.op,
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.op = PROC_CN_MCAST_LISTEN,
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};
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if (write (ctx.proc_fd, &subscription, sizeof subscription) < 0)
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exit_fatal ("failed to subscribe for events: %s", strerror (errno));
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poller_fd_init (&ctx.proc_event, &ctx.poller, ctx.proc_fd);
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ctx.proc_event.dispatcher = (poller_fd_fn) on_event;
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ctx.proc_event.user_data = &ctx;
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poller_fd_set (&ctx.proc_event, POLLIN);
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ctx.polling = true;
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while (ctx.polling)
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poller_run (&ctx.poller);
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poller_free (&ctx.poller);
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xclose (ctx.proc_fd);
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return EXIT_SUCCESS;
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}
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