99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <sys/socket.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <sys/types.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <assert.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <time.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <string.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <stdio.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <errno.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <unistd.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <sys/poll.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <sys/epoll.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <sys/un.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include <fcntl.h>

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include "util.h"

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include "log.h"

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include "list.h"

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include "sd-daemon.h"

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#include "tcpwrap.h"

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#define STREAMS_MAX 256

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#define SERVER_FD_MAX 16

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering#define TIMEOUT ((int) (10*MSEC_PER_SEC))

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringtypedef struct Stream Stream;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringtypedef struct Server {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int syslog_fd;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int kmsg_fd;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int epoll_fd;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering unsigned n_server_fd;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering LIST_HEAD(Stream, streams);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering unsigned n_streams;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering} Server;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringtypedef enum StreamTarget {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_SYSLOG,

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_KMSG

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering} StreamTarget;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringtypedef enum StreamState {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_TARGET,

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_PRIORITY,

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_PROCESS,

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_PREFIX,

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering STREAM_RUNNING

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering} StreamState;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringstruct Stream {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering Server *server;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering StreamState state;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int fd;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering StreamTarget target;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int priority;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering char *process;

b040723ea412209e0edf54647fa5aa4287411507Jan Engelhardt pid_t pid;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering uid_t uid;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering gid_t gid;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering bool prefix;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering char buffer[LINE_MAX];

e0e009c067aa7237f9683c46e5845bbb11ec67c2Jan Engelhardt size_t length;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering LIST_FIELDS(Stream, stream);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering};

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poetteringstatic int stream_log(Stream *s, char *p, usec_t ts) {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering char header_priority[16], header_time[64], header_pid[16];

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering struct iovec iovec[5];

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering int priority;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

b040723ea412209e0edf54647fa5aa4287411507Jan Engelhardt assert(s);

e0e009c067aa7237f9683c46e5845bbb11ec67c2Jan Engelhardt assert(p);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering priority = s->priority;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (s->prefix &&

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering p[0] == '<' &&

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering p[1] >= '0' && p[1] <= '7' &&

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering p[2] == '>') {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering /* Detected priority prefix */

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering priority = LOG_MAKEPRI(LOG_FAC(priority), (p[1] - '0'));

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering p += 3;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering }

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (*p == 0)

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering return 0;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering /*

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering snprintf(header_priority, sizeof(header_priority), "<%i>",

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering s->target == STREAM_SYSLOG ? priority : LOG_PRI(priority));

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering char_array_0(header_priority);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (s->target == STREAM_SYSLOG) {

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering time_t t;

494a66821815e8109afa136bd42818b85da38c09Jan Engelhardt struct tm *tm;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

6bb648a16ae4a682ad4784412af706d2e6a3e4daTom Gundersen t = (time_t) (ts / USEC_PER_SEC);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (!(tm = localtime(&t)))

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering return -EINVAL;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering return -EINVAL;

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering }

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) s->pid);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering char_array_0(header_pid);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering zero(iovec);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering IOVEC_SET_STRING(iovec[0], header_priority);

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering

99e0f83e0bcc54dbc2b3a4f3fdd15fcd3033b21eLennart Poettering if (s->target == STREAM_SYSLOG) {

struct msghdr msghdr;

union {

struct cmsghdr cmsghdr;

uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];

} control;

struct ucred *ucred;

zero(control);

control.cmsghdr.cmsg_level = SOL_SOCKET;

control.cmsghdr.cmsg_type = SCM_CREDENTIALS;

control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));

ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);

ucred->pid = s->pid;

ucred->uid = s->uid;

ucred->gid = s->gid;

IOVEC_SET_STRING(iovec[1], header_time);

IOVEC_SET_STRING(iovec[2], s->process);

IOVEC_SET_STRING(iovec[3], header_pid);

IOVEC_SET_STRING(iovec[4], p);

zero(msghdr);

msghdr.msg_iov = iovec;

msghdr.msg_iovlen = ELEMENTSOF(iovec);

msghdr.msg_control = &control;

msghdr.msg_controllen = control.cmsghdr.cmsg_len;

if (sendmsg(s->server->syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)

return -errno;

} else if (s->target == STREAM_KMSG) {

IOVEC_SET_STRING(iovec[1], s->process);

IOVEC_SET_STRING(iovec[2], header_pid);

IOVEC_SET_STRING(iovec[3], p);

IOVEC_SET_STRING(iovec[4], (char*) "\n");

if (writev(s->server->kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)

return -errno;

} else

assert_not_reached("Unknown log target");

return 0;

}

static int stream_line(Stream *s, char *p, usec_t ts) {

int r;

assert(s);

assert(p);

p = strstrip(p);

switch (s->state) {

case STREAM_TARGET:

if (streq(p, "syslog"))

s->target = STREAM_SYSLOG;

else if (streq(p, "kmsg")) {

if (s->server->kmsg_fd >= 0 && s->uid == 0)

s->target = STREAM_KMSG;

else {

log_warning("/dev/kmsg logging not available.");

return -EPERM;

}

} else {

log_warning("Failed to parse log target line.");

return -EBADMSG;

}

s->state = STREAM_PRIORITY;

return 0;

case STREAM_PRIORITY:

if ((r = safe_atoi(p, &s->priority)) < 0) {

log_warning("Failed to parse log priority line: %m");

return r;

}

if (s->priority < 0) {

log_warning("Log priority negative: %m");

return -ERANGE;

}

s->state = STREAM_PROCESS;

return 0;

case STREAM_PROCESS:

if (!(s->process = strdup(p)))

return -ENOMEM;

s->state = STREAM_PREFIX;

return 0;

case STREAM_PREFIX:

if ((r = parse_boolean(p)) < 0)

return r;

s->prefix = r;

s->state = STREAM_RUNNING;

return 0;

case STREAM_RUNNING:

return stream_log(s, p, ts);

}

assert_not_reached("Unknown stream state");

}

static int stream_scan(Stream *s, usec_t ts) {

char *p;

size_t remaining;

int r = 0;

assert(s);

p = s->buffer;

remaining = s->length;

for (;;) {

char *newline;

if (!(newline = memchr(p, '\n', remaining)))

break;

*newline = 0;

if ((r = stream_line(s, p, ts)) >= 0) {

remaining -= newline-p+1;

p = newline+1;

}

}

if (p > s->buffer) {

memmove(s->buffer, p, remaining);

s->length = remaining;

}

return r;

}

static int stream_process(Stream *s, usec_t ts) {

ssize_t l;

int r;

assert(s);

if ((l = read(s->fd, s->buffer+s->length, LINE_MAX-s->length)) < 0) {

if (errno == EAGAIN)

return 0;

log_warning("Failed to read from stream: %m");

return -1;

}

if (l == 0)

return 0;

s->length += l;

r = stream_scan(s, ts);

if (r < 0)

return r;

return 1;

}

static void stream_free(Stream *s) {

assert(s);

if (s->server) {

assert(s->server->n_streams > 0);

s->server->n_streams--;

LIST_REMOVE(Stream, stream, s->server->streams, s);

}

if (s->fd >= 0) {

if (s->server)

epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);

close_nointr_nofail(s->fd);

}

free(s->process);

free(s);

}

static int stream_new(Server *s, int server_fd) {

Stream *stream;

int fd;

struct ucred ucred;

socklen_t len = sizeof(ucred);

struct epoll_event ev;

int r;

assert(s);

if ((fd = accept4(server_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC)) < 0)

return -errno;

if (s->n_streams >= STREAMS_MAX) {

log_warning("Too many connections, refusing connection.");

close_nointr_nofail(fd);

return 0;

}

if (!socket_tcpwrap(fd, "systemd-logger")) {

close_nointr_nofail(fd);

return 0;

}

if (!(stream = new0(Stream, 1))) {

close_nointr_nofail(fd);

return -ENOMEM;

}

stream->fd = fd;

if (getsockopt(stream->fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len) < 0) {

r = -errno;

goto fail;

}

if (shutdown(fd, SHUT_WR) < 0) {

r = -errno;

goto fail;

}

zero(ev);

ev.data.ptr = stream;

ev.events = EPOLLIN;

if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {

r = -errno;

goto fail;

}

stream->pid = ucred.pid;

stream->uid = ucred.uid;

stream->gid = ucred.gid;

stream->server = s;

LIST_PREPEND(Stream, stream, s->streams, stream);

s->n_streams ++;

return 0;

fail:

stream_free(stream);

return r;

}

static void server_done(Server *s) {

unsigned i;

assert(s);

while (s->streams)

stream_free(s->streams);

for (i = 0; i < s->n_server_fd; i++)

close_nointr_nofail(SD_LISTEN_FDS_START+i);

if (s->syslog_fd >= 0)

close_nointr_nofail(s->syslog_fd);

if (s->epoll_fd >= 0)

close_nointr_nofail(s->epoll_fd);

if (s->kmsg_fd >= 0)

close_nointr_nofail(s->kmsg_fd);

}

static int server_init(Server *s, unsigned n_sockets) {

int r;

unsigned i;

union {

struct sockaddr sa;

struct sockaddr_un un;

} sa;

assert(s);

assert(n_sockets > 0);

zero(*s);

s->n_server_fd = n_sockets;

s->syslog_fd = -1;

s->kmsg_fd = -1;

if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {

r = -errno;

log_error("Failed to create epoll object: %m");

goto fail;

}

for (i = 0; i < n_sockets; i++) {

struct epoll_event ev;

int fd;

fd = SD_LISTEN_FDS_START+i;

if ((r = sd_is_socket(fd, AF_UNSPEC, SOCK_STREAM, 1)) < 0) {

log_error("Failed to determine file descriptor type: %s", strerror(-r));

goto fail;

}

if (!r) {

log_error("Wrong file descriptor type.");

r = -EINVAL;

goto fail;

}

/* We use ev.data.ptr instead of ev.data.fd here,

zero(ev);

ev.events = EPOLLIN;

ev.data.ptr = INT_TO_PTR(fd);

if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {

r = -errno;

log_error("Failed to add server fd to epoll object: %m");

goto fail;

}

}

if ((s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {

r = -errno;

log_error("Failed to create log fd: %m");

goto fail;

}

zero(sa);

sa.un.sun_family = AF_UNIX;

strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));

if (connect(s->syslog_fd, &sa.sa, sizeof(sa)) < 0) {

r = -errno;

log_error("Failed to connect log socket to /dev/log: %m");

goto fail;

}

/* /dev/kmsg logging is strictly optional */

if ((s->kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)

log_warning("Failed to open /dev/kmsg for logging, disabling kernel log buffer support: %m");

return 0;

fail:

server_done(s);

return r;

}

static int process_event(Server *s, struct epoll_event *ev) {

int r;

assert(s);

/* Yes, this is a bit ugly, we assume that that valid pointers

if (PTR_TO_INT(ev->data.ptr) >= SD_LISTEN_FDS_START &&

PTR_TO_INT(ev->data.ptr) < SD_LISTEN_FDS_START+(int)s->n_server_fd) {

if (ev->events != EPOLLIN) {

log_info("Got invalid event from epoll. (1)");

return -EIO;

}

if ((r = stream_new(s, PTR_TO_INT(ev->data.ptr))) < 0) {

log_info("Failed to accept new connection: %s", strerror(-r));

return r;

}

} else {

usec_t ts;

Stream *stream = ev->data.ptr;

ts = now(CLOCK_REALTIME);

if (!(ev->events & EPOLLIN)) {

log_info("Got invalid event from epoll. (2)");

stream_free(stream);

return 0;

}

if ((r = stream_process(stream, ts)) <= 0) {

if (r < 0)

log_info("Got error on stream: %s", strerror(-r));

stream_free(stream);

return 0;

}

}

return 0;

}

int main(int argc, char *argv[]) {

Server server;

int r = 3, n;

if (getppid() != 1) {

log_error("This program should be invoked by init only.");

return 1;

}

if (argc > 1) {

log_error("This program does not take arguments.");

return 1;

}

log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);

log_parse_environment();

log_open();

if ((n = sd_listen_fds(true)) < 0) {

log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));

return 1;

}

if (n <= 0 || n > SERVER_FD_MAX) {

log_error("No or too many file descriptors passed.");

return 2;

}

if (server_init(&server, (unsigned) n) < 0)

return 3;

log_debug("systemd-logger running as pid %lu", (unsigned long) getpid());

sd_notify(false,

"READY=1\n"

"STATUS=Processing requests...");

for (;;) {

struct epoll_event event;

int k;

if ((k = epoll_wait(server.epoll_fd,

&event, 1,

server.n_streams <= 0 ? TIMEOUT : -1)) < 0) {

if (errno == EINTR)

continue;

log_error("epoll_wait() failed: %m");

goto fail;

}

if (k <= 0)

break;

if (process_event(&server, &event) < 0)

goto fail;

}

r = 0;

log_debug("systemd-logger stopped as pid %lu", (unsigned long) getpid());

fail:

sd_notify(false,

"STATUS=Shutting down...");

server_done(&server);

return r;

}