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cups/cups-systemd-socket.patch

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Add socket activation patch
2011-07-04 20:04:49 +00:00
From 1db0a48375836c7e93ac30649007c2391be8b3b2 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 4 Jul 2011 01:37:01 +0200
Subject: [PATCH] systemd: add systemd socket activation and unit files
On newer Linux machines systemd supports launchd-style socket
activation. This patch adds support for this mechanism and also adds
systemd unit files as appropriate to hook this up with systemd.
This includes an MIT-licensed drop-in file that implements the most
basic interfaces needed to get the file descriptors from systemd. Most
of the systemd and Linux-specific code compiles to NOPs on other
systems.
Three triggers to start CUPS are defined: a) if new printer hardware is
plugged in, b) when a client accesses the CUPS socket and c) when a
spool file resides in /var/spool/cups.
---
Makedefs.in | 2 +
config-scripts/cups-systemd.m4 | 25 ++
configure.in | 4 +
data/Makefile | 9 +
data/cups.path.in | 8 +
data/cups.service.in | 9 +
data/cups.socket.in | 9 +
scheduler/Makefile | 9 +
scheduler/main.c | 107 ++++++++
scheduler/sd-daemon.c | 520 ++++++++++++++++++++++++++++++++++++++++
scheduler/sd-daemon.h | 277 +++++++++++++++++++++
11 files changed, 979 insertions(+), 0 deletions(-)
create mode 100644 config-scripts/cups-systemd.m4
create mode 100644 data/cups.path.in
create mode 100644 data/cups.service.in
create mode 100644 data/cups.socket.in
create mode 100644 scheduler/sd-daemon.c
create mode 100644 scheduler/sd-daemon.h
diff --git a/Makedefs.in b/Makedefs.in
index 654eea4..02c43b6 100644
--- a/Makedefs.in
+++ b/Makedefs.in
@@ -143,6 +143,7 @@ CXXFLAGS = @CPPFLAGS@ @CXXFLAGS@
CXXLIBS = @CXXLIBS@
DBUS_NOTIFIER = @DBUS_NOTIFIER@
DBUS_NOTIFIERLIBS = @DBUS_NOTIFIERLIBS@
+SYSTEMD_UNITS = @SYSTEMD_UNITS@
DNSSD_BACKEND = @DNSSD_BACKEND@
DSOFLAGS = -L../cups @DSOFLAGS@
DSOLIBS = @DSOLIBS@ $(COMMONLIBS)
@@ -267,6 +268,7 @@ PAMFILE = @PAMFILE@
DEFAULT_LAUNCHD_CONF = @DEFAULT_LAUNCHD_CONF@
DBUSDIR = @DBUSDIR@
+SYSTEMDUNITDIR = $(BUILDROOT)@systemdsystemunitdir@
#
diff --git a/config-scripts/cups-systemd.m4 b/config-scripts/cups-systemd.m4
new file mode 100644
index 0000000..fead8a9
--- /dev/null
+++ b/config-scripts/cups-systemd.m4
@@ -0,0 +1,25 @@
+dnl
+dnl "$Id$"
+dnl
+dnl systemd stuff for CUPS.
+
+dnl Find whether systemd is available
+
+AC_ARG_WITH([systemdsystemunitdir],
+ AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
+ [], [with_systemdsystemunitdir=$($PKGCONFIG --variable=systemdsystemunitdir systemd)])
+if test "x$with_systemdsystemunitdir" != xno; then
+ AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
+fi
+
+if test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ; then
+ SYSTEMD_UNITS="cups.service cups.socket cups.path"
+else
+ SYSTEMD_UNITS=""
+fi
+
+AC_SUBST(SYSTEMD_UNITS)
+
+dnl
+dnl "$Id$"
+dnl
diff --git a/configure.in b/configure.in
index 560f4f8..b0c19a9 100644
--- a/configure.in
+++ b/configure.in
@@ -37,6 +37,7 @@ sinclude(config-scripts/cups-pam.m4)
sinclude(config-scripts/cups-largefile.m4)
sinclude(config-scripts/cups-dnssd.m4)
sinclude(config-scripts/cups-launchd.m4)
+sinclude(config-scripts/cups-systemd.m4)
sinclude(config-scripts/cups-defaults.m4)
sinclude(config-scripts/cups-pdf.m4)
sinclude(config-scripts/cups-scripting.m4)
@@ -71,6 +72,9 @@ AC_OUTPUT(Makedefs
conf/snmp.conf
cups-config
data/testprint
+ data/cups.service
+ data/cups.socket
+ data/cups.path
desktop/cups.desktop
doc/help/ref-cupsd-conf.html
doc/help/standard.html
diff --git a/data/Makefile b/data/Makefile
index b9de21a..cccab85 100644
--- a/data/Makefile
+++ b/data/Makefile
@@ -112,6 +112,12 @@ install-data:
$(INSTALL_DATA) $$file $(DATADIR)/ppdc; \
done
$(INSTALL_DIR) -m 755 $(DATADIR)/profiles
+ if test "x$(SYSTEMD_UNITS)" != "x" ; then \
+ $(INSTALL_DIR) -m 755 $(SYSTEMDUNITDIR); \
+ for file in $(SYSTEMD_UNITS); do \
+ $(INSTALL_DATA) $$file $(SYSTEMDUNITDIR); \
+ done; \
+ fi
#
@@ -159,6 +165,9 @@ uninstall:
-$(RMDIR) $(DATADIR)/charsets
-$(RMDIR) $(DATADIR)/banners
-$(RMDIR) $(DATADIR)
+ for file in $(SYSTEMD_UNITS); do \
+ $(RM) $(SYSTEMDUNITDIR)/$$file; \
+ done
#
diff --git a/data/cups.path.in b/data/cups.path.in
new file mode 100644
index 0000000..c99e39b
--- /dev/null
+++ b/data/cups.path.in
@@ -0,0 +1,8 @@
+[Unit]
+Description=CUPS Printer Service Spool
+
+[Path]
+DirectoryNotEmpty=@CUPS_REQUESTS@
+
+[Install]
+WantedBy=multi-user.target
diff --git a/data/cups.service.in b/data/cups.service.in
new file mode 100644
index 0000000..007d0e6
--- /dev/null
+++ b/data/cups.service.in
@@ -0,0 +1,9 @@
+[Unit]
+Description=CUPS Printing Service
+
+[Service]
+ExecStart=@sbindir@/cupsd -f
+
+[Install]
+Also=cups.socket cups.path
+WantedBy=printer.target
diff --git a/data/cups.socket.in b/data/cups.socket.in
new file mode 100644
index 0000000..b940096
--- /dev/null
+++ b/data/cups.socket.in
@@ -0,0 +1,9 @@
+[Unit]
+Description=CUPS Printing Service Sockets
+
+[Socket]
+ListenStream=@CUPS_DEFAULT_DOMAINSOCKET@
+ListenStream=631
+
+[Install]
+WantedBy=sockets.target
diff --git a/scheduler/Makefile b/scheduler/Makefile
index 3c7da8e..05152a6 100644
--- a/scheduler/Makefile
+++ b/scheduler/Makefile
@@ -39,6 +39,7 @@ CUPSDOBJS = \
server.o \
statbuf.o \
subscriptions.o \
+ sd-daemon.o \
sysman.o
LIBOBJS = \
filter.o \
@@ -568,6 +569,14 @@ sloc:
#
+# Update sd-daemon.[ch] drop-in file from upstream git
+#
+
+update-systemd:
+ curl http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.c > sd-daemon.c
+ curl http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.h > sd-daemon.h
+
+#
# Dependencies...
#
diff --git a/scheduler/main.c b/scheduler/main.c
index baaa3a1..5a4b8e1 100644
--- a/scheduler/main.c
+++ b/scheduler/main.c
@@ -26,6 +26,8 @@
* launchd_checkin() - Check-in with launchd and collect the listening
* fds.
* launchd_checkout() - Update the launchd KeepAlive file as needed.
+ * systemd_checkin() - Check-in with systemd and collect the
+ * listening fds.
* parent_handler() - Catch USR1/CHLD signals...
* process_children() - Process all dead children...
* select_timeout() - Calculate the select timeout value.
@@ -62,6 +64,8 @@
# endif /* !LAUNCH_JOBKEY_SERVICEIPC */
#endif /* HAVE_LAUNCH_H */
+#include "sd-daemon.h"
+
#if defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO)
# include <malloc.h>
#endif /* HAVE_MALLOC_H && HAVE_MALLINFO */
@@ -78,6 +82,7 @@
static void launchd_checkin(void);
static void launchd_checkout(void);
#endif /* HAVE_LAUNCHD */
+static void systemd_checkin(void);
static void parent_handler(int sig);
static void process_children(void);
static void sigchld_handler(int sig);
@@ -520,6 +525,11 @@ main(int argc, /* I - Number of command-line args */
#endif /* HAVE_LAUNCHD */
/*
+ * If we were started by systemd get the listen sockets file descriptors...
+ */
+ systemd_checkin();
+
+ /*
* Startup the server...
*/
@@ -731,6 +741,12 @@ main(int argc, /* I - Number of command-line args */
#endif /* HAVE_LAUNCHD */
/*
+ * If we were started by systemd get the listen sockets file descriptors...
+ */
+
+ systemd_checkin();
+
+ /*
* Startup the server...
*/
@@ -1535,6 +1551,97 @@ launchd_checkout(void)
}
#endif /* HAVE_LAUNCHD */
+static void
+systemd_checkin(void)
+{
+ int n, fd;
+
+ n = sd_listen_fds(1);
+ if (n < 0)
+ {
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "systemd_checkin: Failed to acquire sockets from systemd - %s",
+ strerror(-n));
+ exit(EXIT_FAILURE);
+ return;
+ }
+
+ if (n == 0)
+ return;
+
+ for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
+ {
+ http_addr_t addr;
+ socklen_t addrlen;
+ int r;
+ cupsd_listener_t *lis;
+ char s[256];
+
+ r = sd_is_socket(fd, AF_UNSPEC, SOCK_STREAM, 1);
+ if (r < 0) {
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "systemd_checkin: Unable to verify socket type - %s",
+ strerror(-r));
+ continue;
+ }
+
+ if (!r) {
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "systemd_checkin: Socket not of the right type");
+ continue;
+ }
+
+ if (getsockname(fd, (struct sockaddr*) &addr, &addrlen))
+ {
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "systemd_checkin: Unable to get local address - %s",
+ strerror(errno));
+ continue;
+ }
+
+ /*
+ * Try to match the systemd socket address to one of the listeners...
+ */
+
+ for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
+ lis;
+ lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
+ if (httpAddrEqual(&lis->address, &addr))
+ break;
+
+ if (lis)
+ {
+ cupsdLogMessage(CUPSD_LOG_DEBUG,
+ "systemd_checkin: Matched existing listener %s with fd %d...",
+ httpAddrString(&(lis->address), s, sizeof(s)), fd);
+ }
+ else
+ {
+ cupsdLogMessage(CUPSD_LOG_DEBUG,
+ "systemd_checkin: Adding new listener %s with fd %d...",
+ httpAddrString(&addr, s, sizeof(s)), fd);
+
+ if ((lis = calloc(1, sizeof(cupsd_listener_t))) == NULL)
+ {
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "systemd_checkin: Unable to allocate listener - "
+ "%s.", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ cupsArrayAdd(Listeners, lis);
+
+ memcpy(&lis->address, &addr, sizeof(lis->address));
+ }
+
+ lis->fd = fd;
+
+# ifdef HAVE_SSL
+ if (_httpAddrPort(&(lis->address)) == 443)
+ lis->encryption = HTTP_ENCRYPT_ALWAYS;
+# endif /* HAVE_SSL */
+ }
+}
/*
* 'parent_handler()' - Catch USR1/CHLD signals...
diff --git a/scheduler/sd-daemon.c b/scheduler/sd-daemon.c
new file mode 100644
index 0000000..a2ec74c
--- /dev/null
+++ b/scheduler/sd-daemon.c
@@ -0,0 +1,520 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/fcntl.h>
+#include <netinet/in.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <limits.h>
+
+#if defined(__linux__)
+#include <mqueue.h>
+#endif
+
+#include "sd-daemon.h"
+
+#if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
+#define _sd_hidden_ __attribute__ ((visibility("hidden")))
+#else
+#define _sd_hidden_
+#endif
+
+_sd_hidden_ int sd_listen_fds(int unset_environment) {
+
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+ return 0;
+#else
+ int r, fd;
+ const char *e;
+ char *p = NULL;
+ unsigned long l;
+
+ if (!(e = getenv("LISTEN_PID"))) {
+ r = 0;
+ goto finish;
+ }
+
+ errno = 0;
+ l = strtoul(e, &p, 10);
+
+ if (errno != 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (!p || *p || l <= 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ /* Is this for us? */
+ if (getpid() != (pid_t) l) {
+ r = 0;
+ goto finish;
+ }
+
+ if (!(e = getenv("LISTEN_FDS"))) {
+ r = 0;
+ goto finish;
+ }
+
+ errno = 0;
+ l = strtoul(e, &p, 10);
+
+ if (errno != 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (!p || *p) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
+ int flags;
+
+ if ((flags = fcntl(fd, F_GETFD)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (flags & FD_CLOEXEC)
+ continue;
+
+ if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
+ r = -errno;
+ goto finish;
+ }
+ }
+
+ r = (int) l;
+
+finish:
+ if (unset_environment) {
+ unsetenv("LISTEN_PID");
+ unsetenv("LISTEN_FDS");
+ }
+
+ return r;
+#endif
+}
+
+_sd_hidden_ int sd_is_fifo(int fd, const char *path) {
+ struct stat st_fd;
+
+ if (fd < 0)
+ return -EINVAL;
+
+ memset(&st_fd, 0, sizeof(st_fd));
+ if (fstat(fd, &st_fd) < 0)
+ return -errno;
+
+ if (!S_ISFIFO(st_fd.st_mode))
+ return 0;
+
+ if (path) {
+ struct stat st_path;
+
+ memset(&st_path, 0, sizeof(st_path));
+ if (stat(path, &st_path) < 0) {
+
+ if (errno == ENOENT || errno == ENOTDIR)
+ return 0;
+
+ return -errno;
+ }
+
+ return
+ st_path.st_dev == st_fd.st_dev &&
+ st_path.st_ino == st_fd.st_ino;
+ }
+
+ return 1;
+}
+
+_sd_hidden_ int sd_is_special(int fd, const char *path) {
+ struct stat st_fd;
+
+ if (fd < 0)
+ return -EINVAL;
+
+ if (fstat(fd, &st_fd) < 0)
+ return -errno;
+
+ if (!S_ISREG(st_fd.st_mode) && !S_ISCHR(st_fd.st_mode))
+ return 0;
+
+ if (path) {
+ struct stat st_path;
+
+ if (stat(path, &st_path) < 0) {
+
+ if (errno == ENOENT || errno == ENOTDIR)
+ return 0;
+
+ return -errno;
+ }
+
+ if (S_ISREG(st_fd.st_mode) && S_ISREG(st_path.st_mode))
+ return
+ st_path.st_dev == st_fd.st_dev &&
+ st_path.st_ino == st_fd.st_ino;
+ else if (S_ISCHR(st_fd.st_mode) && S_ISCHR(st_path.st_mode))
+ return st_path.st_rdev == st_fd.st_rdev;
+ else
+ return 0;
+ }
+
+ return 1;
+}
+
+static int sd_is_socket_internal(int fd, int type, int listening) {
+ struct stat st_fd;
+
+ if (fd < 0 || type < 0)
+ return -EINVAL;
+
+ if (fstat(fd, &st_fd) < 0)
+ return -errno;
+
+ if (!S_ISSOCK(st_fd.st_mode))
+ return 0;
+
+ if (type != 0) {
+ int other_type = 0;
+ socklen_t l = sizeof(other_type);
+
+ if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
+ return -errno;
+
+ if (l != sizeof(other_type))
+ return -EINVAL;
+
+ if (other_type != type)
+ return 0;
+ }
+
+ if (listening >= 0) {
+ int accepting = 0;
+ socklen_t l = sizeof(accepting);
+
+ if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
+ return -errno;
+
+ if (l != sizeof(accepting))
+ return -EINVAL;
+
+ if (!accepting != !listening)
+ return 0;
+ }
+
+ return 1;
+}
+
+union sockaddr_union {
+ struct sockaddr sa;
+ struct sockaddr_in in4;
+ struct sockaddr_in6 in6;
+ struct sockaddr_un un;
+ struct sockaddr_storage storage;
+};
+
+_sd_hidden_ int sd_is_socket(int fd, int family, int type, int listening) {
+ int r;
+
+ if (family < 0)
+ return -EINVAL;
+
+ if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+ return r;
+
+ if (family > 0) {
+ union sockaddr_union sockaddr;
+ socklen_t l;
+
+ memset(&sockaddr, 0, sizeof(sockaddr));
+ l = sizeof(sockaddr);
+
+ if (getsockname(fd, &sockaddr.sa, &l) < 0)
+ return -errno;
+
+ if (l < sizeof(sa_family_t))
+ return -EINVAL;
+
+ return sockaddr.sa.sa_family == family;
+ }
+
+ return 1;
+}
+
+_sd_hidden_ int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
+ union sockaddr_union sockaddr;
+ socklen_t l;
+ int r;
+
+ if (family != 0 && family != AF_INET && family != AF_INET6)
+ return -EINVAL;
+
+ if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+ return r;
+
+ memset(&sockaddr, 0, sizeof(sockaddr));
+ l = sizeof(sockaddr);
+
+ if (getsockname(fd, &sockaddr.sa, &l) < 0)
+ return -errno;
+
+ if (l < sizeof(sa_family_t))
+ return -EINVAL;
+
+ if (sockaddr.sa.sa_family != AF_INET &&
+ sockaddr.sa.sa_family != AF_INET6)
+ return 0;
+
+ if (family > 0)
+ if (sockaddr.sa.sa_family != family)
+ return 0;
+
+ if (port > 0) {
+ if (sockaddr.sa.sa_family == AF_INET) {
+ if (l < sizeof(struct sockaddr_in))
+ return -EINVAL;
+
+ return htons(port) == sockaddr.in4.sin_port;
+ } else {
+ if (l < sizeof(struct sockaddr_in6))
+ return -EINVAL;
+
+ return htons(port) == sockaddr.in6.sin6_port;
+ }
+ }
+
+ return 1;
+}
+
+_sd_hidden_ int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
+ union sockaddr_union sockaddr;
+ socklen_t l;
+ int r;
+
+ if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+ return r;
+
+ memset(&sockaddr, 0, sizeof(sockaddr));
+ l = sizeof(sockaddr);
+
+ if (getsockname(fd, &sockaddr.sa, &l) < 0)
+ return -errno;
+
+ if (l < sizeof(sa_family_t))
+ return -EINVAL;
+
+ if (sockaddr.sa.sa_family != AF_UNIX)
+ return 0;
+
+ if (path) {
+ if (length <= 0)
+ length = strlen(path);
+
+ if (length <= 0)
+ /* Unnamed socket */
+ return l == offsetof(struct sockaddr_un, sun_path);
+
+ if (path[0])
+ /* Normal path socket */
+ return
+ (l >= offsetof(struct sockaddr_un, sun_path) + length + 1) &&
+ memcmp(path, sockaddr.un.sun_path, length+1) == 0;
+ else
+ /* Abstract namespace socket */
+ return
+ (l == offsetof(struct sockaddr_un, sun_path) + length) &&
+ memcmp(path, sockaddr.un.sun_path, length) == 0;
+ }
+
+ return 1;
+}
+
+_sd_hidden_ int sd_is_mq(int fd, const char *path) {
+#if !defined(__linux__)
+ return 0;
+#else
+ struct mq_attr attr;
+
+ if (fd < 0)
+ return -EINVAL;
+
+ if (mq_getattr(fd, &attr) < 0)
+ return -errno;
+
+ if (path) {
+ char fpath[PATH_MAX];
+ struct stat a, b;
+
+ if (path[0] != '/')
+ return -EINVAL;
+
+ if (fstat(fd, &a) < 0)
+ return -errno;
+
+ strncpy(stpcpy(fpath, "/dev/mqueue"), path, sizeof(fpath) - 12);
+ fpath[sizeof(fpath)-1] = 0;
+
+ if (stat(fpath, &b) < 0)
+ return -errno;
+
+ if (a.st_dev != b.st_dev ||
+ a.st_ino != b.st_ino)
+ return 0;
+ }
+
+ return 1;
+#endif
+}
+
+_sd_hidden_ int sd_notify(int unset_environment, const char *state) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__) || !defined(SOCK_CLOEXEC)
+ return 0;
+#else
+ int fd = -1, r;
+ struct msghdr msghdr;
+ struct iovec iovec;
+ union sockaddr_union sockaddr;
+ const char *e;
+
+ if (!state) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (!(e = getenv("NOTIFY_SOCKET")))
+ return 0;
+
+ /* Must be an abstract socket, or an absolute path */
+ if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ memset(&sockaddr, 0, sizeof(sockaddr));
+ sockaddr.sa.sa_family = AF_UNIX;
+ strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
+
+ if (sockaddr.un.sun_path[0] == '@')
+ sockaddr.un.sun_path[0] = 0;
+
+ memset(&iovec, 0, sizeof(iovec));
+ iovec.iov_base = (char*) state;
+ iovec.iov_len = strlen(state);
+
+ memset(&msghdr, 0, sizeof(msghdr));
+ msghdr.msg_name = &sockaddr;
+ msghdr.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(e);
+
+ if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
+ msghdr.msg_namelen = sizeof(struct sockaddr_un);
+
+ msghdr.msg_iov = &iovec;
+ msghdr.msg_iovlen = 1;
+
+ if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ r = 1;
+
+finish:
+ if (unset_environment)
+ unsetenv("NOTIFY_SOCKET");
+
+ if (fd >= 0)
+ close(fd);
+
+ return r;
+#endif
+}
+
+_sd_hidden_ int sd_notifyf(int unset_environment, const char *format, ...) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+ return 0;
+#else
+ va_list ap;
+ char *p = NULL;
+ int r;
+
+ va_start(ap, format);
+ r = vasprintf(&p, format, ap);
+ va_end(ap);
+
+ if (r < 0 || !p)
+ return -ENOMEM;
+
+ r = sd_notify(unset_environment, p);
+ free(p);
+
+ return r;
+#endif
+}
+
+_sd_hidden_ int sd_booted(void) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+ return 0;
+#else
+
+ struct stat a, b;
+
+ /* We simply test whether the systemd cgroup hierarchy is
+ * mounted */
+
+ if (lstat("/sys/fs/cgroup", &a) < 0)
+ return 0;
+
+ if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
+ return 0;
+
+ return a.st_dev != b.st_dev;
+#endif
+}
diff --git a/scheduler/sd-daemon.h b/scheduler/sd-daemon.h
new file mode 100644
index 0000000..46dc7fd
--- /dev/null
+++ b/scheduler/sd-daemon.h
@@ -0,0 +1,277 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosddaemonhfoo
+#define foosddaemonhfoo
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#include <sys/types.h>
+#include <inttypes.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ Reference implementation of a few systemd related interfaces for
+ writing daemons. These interfaces are trivial to implement. To
+ simplify porting we provide this reference implementation.
+ Applications are welcome to reimplement the algorithms described
+ here if they do not want to include these two source files.
+
+ The following functionality is provided:
+
+ - Support for logging with log levels on stderr
+ - File descriptor passing for socket-based activation
+ - Daemon startup and status notification
+ - Detection of systemd boots
+
+ You may compile this with -DDISABLE_SYSTEMD to disable systemd
+ support. This makes all those calls NOPs that are directly related to
+ systemd (i.e. only sd_is_xxx() will stay useful).
+
+ Since this is drop-in code we don't want any of our symbols to be
+ exported in any case. Hence we declare hidden visibility for all of
+ them.
+
+ You may find an up-to-date version of these source files online:
+
+ http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.h
+ http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.c
+
+ This should compile on non-Linux systems, too, but with the
+ exception of the sd_is_xxx() calls all functions will become NOPs.
+
+ See sd-daemon(7) for more information.
+*/
+
+#ifndef _sd_printf_attr_
+#if __GNUC__ >= 4
+#define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
+#else
+#define _sd_printf_attr_(a,b)
+#endif
+#endif
+
+/*
+ Log levels for usage on stderr:
+
+ fprintf(stderr, SD_NOTICE "Hello World!\n");
+
+ This is similar to printk() usage in the kernel.
+*/
+#define SD_EMERG "<0>" /* system is unusable */
+#define SD_ALERT "<1>" /* action must be taken immediately */
+#define SD_CRIT "<2>" /* critical conditions */
+#define SD_ERR "<3>" /* error conditions */
+#define SD_WARNING "<4>" /* warning conditions */
+#define SD_NOTICE "<5>" /* normal but significant condition */
+#define SD_INFO "<6>" /* informational */
+#define SD_DEBUG "<7>" /* debug-level messages */
+
+/* The first passed file descriptor is fd 3 */
+#define SD_LISTEN_FDS_START 3
+
+/*
+ Returns how many file descriptors have been passed, or a negative
+ errno code on failure. Optionally, removes the $LISTEN_FDS and
+ $LISTEN_PID file descriptors from the environment (recommended, but
+ problematic in threaded environments). If r is the return value of
+ this function you'll find the file descriptors passed as fds
+ SD_LISTEN_FDS_START to SD_LISTEN_FDS_START+r-1. Returns a negative
+ errno style error code on failure. This function call ensures that
+ the FD_CLOEXEC flag is set for the passed file descriptors, to make
+ sure they are not passed on to child processes. If FD_CLOEXEC shall
+ not be set, the caller needs to unset it after this call for all file
+ descriptors that are used.
+
+ See sd_listen_fds(3) for more information.
+*/
+int sd_listen_fds(int unset_environment);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is a FIFO in the file system stored under the
+ specified path, 0 otherwise. If path is NULL a path name check will
+ not be done and the call only verifies if the file descriptor
+ refers to a FIFO. Returns a negative errno style error code on
+ failure.
+
+ See sd_is_fifo(3) for more information.
+*/
+int sd_is_fifo(int fd, const char *path);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is a special character device on the file
+ system stored under the specified path, 0 otherwise.
+ If path is NULL a path name check will not be done and the call
+ only verifies if the file descriptor refers to a special character.
+ Returns a negative errno style error code on failure.
+
+ See sd_is_special(3) for more information.
+*/
+int sd_is_special(int fd, const char *path);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is a socket of the specified family (AF_INET,
+ ...) and type (SOCK_DGRAM, SOCK_STREAM, ...), 0 otherwise. If
+ family is 0 a socket family check will not be done. If type is 0 a
+ socket type check will not be done and the call only verifies if
+ the file descriptor refers to a socket. If listening is > 0 it is
+ verified that the socket is in listening mode. (i.e. listen() has
+ been called) If listening is == 0 it is verified that the socket is
+ not in listening mode. If listening is < 0 no listening mode check
+ is done. Returns a negative errno style error code on failure.
+
+ See sd_is_socket(3) for more information.
+*/
+int sd_is_socket(int fd, int family, int type, int listening);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is an Internet socket, of the specified family
+ (either AF_INET or AF_INET6) and the specified type (SOCK_DGRAM,
+ SOCK_STREAM, ...), 0 otherwise. If version is 0 a protocol version
+ check is not done. If type is 0 a socket type check will not be
+ done. If port is 0 a socket port check will not be done. The
+ listening flag is used the same way as in sd_is_socket(). Returns a
+ negative errno style error code on failure.
+
+ See sd_is_socket_inet(3) for more information.
+*/
+int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is an AF_UNIX socket of the specified type
+ (SOCK_DGRAM, SOCK_STREAM, ...) and path, 0 otherwise. If type is 0
+ a socket type check will not be done. If path is NULL a socket path
+ check will not be done. For normal AF_UNIX sockets set length to
+ 0. For abstract namespace sockets set length to the length of the
+ socket name (including the initial 0 byte), and pass the full
+ socket path in path (including the initial 0 byte). The listening
+ flag is used the same way as in sd_is_socket(). Returns a negative
+ errno style error code on failure.
+
+ See sd_is_socket_unix(3) for more information.
+*/
+int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);
+
+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is a POSIX Message Queue of the specified name,
+ 0 otherwise. If path is NULL a message queue name check is not
+ done. Returns a negative errno style error code on failure.
+*/
+int sd_is_mq(int fd, const char *path);
+
+/*
+ Informs systemd about changed daemon state. This takes a number of
+ newline separated environment-style variable assignments in a
+ string. The following variables are known:
+
+ READY=1 Tells systemd that daemon startup is finished (only
+ relevant for services of Type=notify). The passed
+ argument is a boolean "1" or "0". Since there is
+ little value in signaling non-readiness the only
+ value daemons should send is "READY=1".
+
+ STATUS=... Passes a single-line status string back to systemd
+ that describes the daemon state. This is free-from
+ and can be used for various purposes: general state
+ feedback, fsck-like programs could pass completion
+ percentages and failing programs could pass a human
+ readable error message. Example: "STATUS=Completed
+ 66% of file system check..."
+
+ ERRNO=... If a daemon fails, the errno-style error code,
+ formatted as string. Example: "ERRNO=2" for ENOENT.
+
+ BUSERROR=... If a daemon fails, the D-Bus error-style error
+ code. Example: "BUSERROR=org.freedesktop.DBus.Error.TimedOut"
+
+ MAINPID=... The main pid of a daemon, in case systemd did not
+ fork off the process itself. Example: "MAINPID=4711"
+
+ Daemons can choose to send additional variables. However, it is
+ recommended to prefix variable names not listed above with X_.
+
+ Returns a negative errno-style error code on failure. Returns > 0
+ if systemd could be notified, 0 if it couldn't possibly because
+ systemd is not running.
+
+ Example: When a daemon finished starting up, it could issue this
+ call to notify systemd about it:
+
+ sd_notify(0, "READY=1");
+
+ See sd_notifyf() for more complete examples.
+
+ See sd_notify(3) for more information.
+*/
+int sd_notify(int unset_environment, const char *state);
+
+/*
+ Similar to sd_notify() but takes a format string.
+
+ Example 1: A daemon could send the following after initialization:
+
+ sd_notifyf(0, "READY=1\n"
+ "STATUS=Processing requests...\n"
+ "MAINPID=%lu",
+ (unsigned long) getpid());
+
+ Example 2: A daemon could send the following shortly before
+ exiting, on failure:
+
+ sd_notifyf(0, "STATUS=Failed to start up: %s\n"
+ "ERRNO=%i",
+ strerror(errno),
+ errno);
+
+ See sd_notifyf(3) for more information.
+*/
+int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_attr_(2,3);
+
+/*
+ Returns > 0 if the system was booted with systemd. Returns < 0 on
+ error. Returns 0 if the system was not booted with systemd. Note
+ that all of the functions above handle non-systemd boots just
+ fine. You should NOT protect them with a call to this function. Also
+ note that this function checks whether the system, not the user
+ session is controlled by systemd. However the functions above work
+ for both user and system services.
+
+ See sd_booted(3) for more information.
+*/
+int sd_booted(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
1.7.6
Reference in New Issue Copy Permalink