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-rw-r--r--src/README2
-rw-r--r--src/daemon.h10
-rw-r--r--src/satd-diminished.c104
-rw-r--r--src/satd.c30
4 files changed, 119 insertions, 27 deletions
diff --git a/src/README b/src/README
index d9404d2..c77d17e 100644
--- a/src/README
+++ b/src/README
@@ -9,6 +9,8 @@ satd-add.c The part of satd responding to sat, satd-diminished.c fork–
satd-rm.c The part of satd responding to satrm, satd-diminished.c fork–exec:s to this.
satd-list.c The part of satd responding to satlist, satd-diminished.c fork–exec:s to this.
satd-run.c The part of satd responding to satr, satd-diminished.c fork–exec:s to this.
+satd-timer.c The part of satd responsible for running expired jobs and setting timers
+ to wait for new expirations, satd-diminished.c fork–exec:s to this.
parse_time.[ch] Use by sat.c to parse the time argument.
Only rudimentary parsing is done.
diff --git a/src/daemon.h b/src/daemon.h
index 7567a74..c36e314 100644
--- a/src/daemon.h
+++ b/src/daemon.h
@@ -45,6 +45,16 @@
*/
#define STATE_FILENO 4
+/**
+ * The file descriptor for the CLOCK_BOOTTIME timer.
+ */
+#define BOOT_FILENO 5
+
+/**
+ * The file descriptor for the CLOCK_REALTIME timer.
+ */
+#define REAL_FILENO 6
+
/**
* Command: queue a job.
diff --git a/src/satd-diminished.c b/src/satd-diminished.c
index e2ba0b9..059ca83 100644
--- a/src/satd-diminished.c
+++ b/src/satd-diminished.c
@@ -25,8 +25,11 @@
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
+#include <stdint.h>
#include <sys/wait.h>
#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/timerfd.h>
@@ -38,12 +41,24 @@
*/
#define DAEMON_IMAGE(name) LIBEXECDIR "/" PACKAGE "/satd-" name
+/**
+ * The value on `timer_pid` when there is not "timer" image running.
+ */
+#define NO_TIMER_SPAWED -2 /* Must be negative, but not -1. */
+
/**
* Signal that has been received, 0 if none.
*/
-static volatile sig_atomic_t received_signo = 0;
+static volatile sig_atomic_t received_signo = SIGCHLD; /* Forces the "timer" image to run. */
+
+/**
+ * The PID the "timer" fork, `NO_TIMER_SPAWED` if not running.
+ *
+ * It does not matter that this is lost on a successful SIGHUP.
+ */
+static volatile pid_t timer_pid = NO_TIMER_SPAWED;
@@ -56,8 +71,8 @@ static void
sighandler(int signo)
{
int saved_errno = errno;
- if (signo == SIGCHLD)
- waitpid(-1, NULL, WNOHANG);
+ if ((signo == SIGCHLD) && (waitpid(-1, NULL, WNOHANG) == timer_pid))
+ timer_pid = NO_TIMER_SPAWED;
else
received_signo = (sig_atomic_t)signo;
errno = saved_errno;
@@ -67,8 +82,8 @@ sighandler(int signo)
/**
* Spawn a libexec.
*
- * @param command The command to spawn.
- * @param fd File descriptor to the socket.
+ * @param command The command to spawn, -1 for "timer".
+ * @param fd File descriptor to the socket, -1 iff `command` is -1.
* @param argv `argv` from `main`.
* @param envp `envp` from `main`.
* @return 0 on success, -1 on error.
@@ -77,9 +92,10 @@ static int
spawn(int command, int fd, char *argv[], char *envp[])
{
const char *image;
+ pid_t pid;
fork_again:
- switch (fork()) {
+ switch ((pid = fork())) {
case -1:
if (errno != EAGAIN)
return -1;
@@ -87,27 +103,53 @@ fork_again:
goto fork_again;
case 0:
switch (command) {
- case SAT_QUEUE: image = DAEMON_IMAGE("add"); break;
- case SAT_REMOVE: image = DAEMON_IMAGE("rm"); break;
- case SAT_PRINT: image = DAEMON_IMAGE("list"); break;
- case SAT_RUN: image = DAEMON_IMAGE("run"); break;
+ case SAT_QUEUE: image = DAEMON_IMAGE("add"); break;
+ case SAT_REMOVE: image = DAEMON_IMAGE("rm"); break;
+ case SAT_PRINT: image = DAEMON_IMAGE("list"); break;
+ case SAT_RUN: image = DAEMON_IMAGE("run"); break;
+ case -1: image = DAEMON_IMAGE("timer"); break;
default:
fprintf(stderr, "%s: invalid command received.\n", argv[0]);
goto child_fail;
}
- if (dup2(fd, SOCK_FILENO) != -1)
- close(fd), fd = SOCK_FILENO, execve(image, argv, envp);
+ if (command < 0) {
+ close(SOCK_FILENO);
+ execve(image, argv, envp);
+ } else {
+ close(BOOT_FILENO), close(REAL_FILENO);
+ if (dup2(fd, SOCK_FILENO) != -1)
+ close(fd), fd = SOCK_FILENO, execve(image, argv, envp);
+ }
perror(argv[0]);
child_fail:
close(fd);
exit(1);
default:
+ if (command < 0)
+ timer_pid = pid;
return 0;
}
}
/**
+ * Determine whether a timer is set.
+ *
+ * @param fd The file descriptor of the timer.
+ * @return 1 if set, 0 if unset, -1 on error.
+ */
+static int
+is_timer_set(int fd)
+{
+ struct itimerspec spec;
+ if (timerfd_gettime(fd, &spec))
+ return -1;
+ return (spec.it_interval.tv_sec || spec.it_value.tv_sec ||
+ spec.it_interval.tv_nsec || spec.it_value.tv_nsec);
+}
+
+
+/**
* The sat daemon.
*
* @param argc Should be 3.
@@ -120,38 +162,59 @@ fork_again:
int
main(int argc, char *argv[], char *envp[])
{
- int fd = -1, rc = 0;
- char type;
+ int fd = -1, rc = 0, accepted = 0, r;
+ unsigned char type;
+ fd_set fdset;
+ int64_t _overrun;
/* Set up signal handlers. */
t (signal(SIGHUP, sighandler) == SIG_ERR);
t (signal(SIGCHLD, sighandler) == SIG_ERR);
/* The magnificent loop. */
-accept_again:
+again:
+ if (accepted && (timer_pid == NO_TIMER_SPAWED)) {
+ t (r = is_timer_set(BOOT_FILENO), r < 0); if (r) goto not_done;
+ t (r = is_timer_set(REAL_FILENO), r < 0); if (r) goto not_done;
+ goto done;
+ }
+not_done:
if (received_signo == SIGHUP) {
execve(DAEMON_IMAGE("diminished"), argv, envp);
perror(argv[0]);
+ } else if (received_signo == SIGCHLD) {
+ t (spawn(-1, -1, argv, envp));
}
received_signo = 0;
- /* TODO run jobs */
+ FD_ZERO(&fdset);
+ FD_SET(SOCK_FILENO, &fdset);
+ FD_SET(BOOT_FILENO, &fdset);
+ FD_SET(REAL_FILENO, &fdset); /* This is the highest one. */
+ if (select(REAL_FILENO + 1, &fdset, NULL, NULL, NULL) == -1) {
+ t (errno != EINTR);
+ }
+ if (FD_ISSET(BOOT_FILENO, &fdset)) t (read(BOOT_FILENO, &_overrun, (size_t)8) < 8);
+ if (FD_ISSET(REAL_FILENO, &fdset)) t (read(REAL_FILENO, &_overrun, (size_t)8) < 8);
+ if (!FD_ISSET(SOCK_FILENO, &fdset))
+ goto again;
if (fd = accept(SOCK_FILENO, NULL, NULL), fd == -1) {
switch (errno) {
case ECONNABORTED:
case EINTR:
- goto accept_again;
+ goto again;
default:
/* Including EMFILE, ENFILE, and ENOMEM
* because of potential resource leak. */
goto fail;
}
}
- if (read(fd, &type, sizeof(char)) <= 0)
+ accepted = 1;
+ if (read(fd, &type, sizeof(type)) <= 0)
perror(argv[0]);
else
- t (spawn(type, fd, argv, envp));
+ t (spawn((int)type, fd, argv, envp));
close(fd), fd = -1;
- goto accept_again;
+ goto again;
fail:
perror(argv[0]);
@@ -159,6 +222,7 @@ fail:
close(fd);
rc = 1;
done:
+ while (waitpid(-1, NULL, 0) > 0);
unlink(argv[1]);
if (!rc)
unlink(argv[2]);
diff --git a/src/satd.c b/src/satd.c
index be50082..df2cda9 100644
--- a/src/satd.c
+++ b/src/satd.c
@@ -29,6 +29,7 @@
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/file.h>
+#include <sys/timerfd.h>
@@ -195,8 +196,9 @@ int
main(int argc, char *argv[])
{
struct sockaddr_un address;
- int sock = -1, state = -1, foreground = 0;
+ int sock = -1, state = -1, boot = -1, real = -1, foreground = 0;
char *path = NULL;
+ struct itimerspec spec;
const char *dir;
/* Parse command line. */
@@ -222,17 +224,30 @@ main(int argc, char *argv[])
t (state = open(path, O_RDWR | O_CREAT /* but not O_EXCL */, S_IRWXU), state == -1);
free(path), path = NULL;
- /* The state fill shall be on fd STATE_FILENO. */
+ /* The state file shall be on fd STATE_FILENO. */
t (dup2_and_null(state, STATE_FILENO) == -1);
state = STATE_FILENO;
/* Create socket. */
t (sock = create_socket(&address), sock == -1);
-
- /* Socket shall be on fd SOCK_FILENO. */
t (dup2_and_null(sock, SOCK_FILENO) == -1);
sock = SOCK_FILENO;
+ /* Create CLOCK_BOOTTIME timer. */
+ t (boot = timerfd_create(CLOCK_BOOTTIME, 0), boot == -1);
+ t (dup2_and_null(boot, BOOT_FILENO) == -1);
+ boot = BOOT_FILENO;
+
+ /* Create CLOCK_REALTIME timer. */
+ t (real = timerfd_create(CLOCK_REALTIME, 0), real == -1);
+ t (dup2_and_null(real, BOOT_FILENO) == -1);
+ real = BOOT_FILENO;
+
+ /* Configure timers. */
+ memset(&spec, 0, sizeof(spec));
+ t (timerfd_settime(boot, TFD_TIMER_ABSTIME, &spec, NULL));
+ t (timerfd_settime(real, TFD_TIMER_ABSTIME, &spec, NULL));
+
/* Listen for incoming conections. */
#if SOMAXCONN < SATD_BACKLOG
t (listen(sock, SOMAXCONN));
@@ -241,7 +256,7 @@ main(int argc, char *argv[])
#endif
/* Daemonise. */
- t (foreground ? 0 : daemonise("satd", DAEMONISE_KEEP_FDS, sock, -1));
+ t (foreground ? 0 : daemonise("satd", DAEMONISE_KEEP_FDS, 3, 4, 5, 6, -1));
/* Change to a process image without all this initialisation text. */
execl(LIBEXECDIR "/" PACKAGE "/satd-diminished", argv0, address.sun_path, NULL);
@@ -254,8 +269,9 @@ fail:
unlink(address.sun_path);
close(sock);
}
- if (state >= 0)
- close(state);
+ if (state >= 0) close(state);
+ if (boot >= 0) close(boot);
+ if (real >= 0) close(real);
undaemonise();
return 1;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-14 05:10:09 +0000