svlogd: new applet. +9k. Still too big, but it was 12k yesterday.

1 files changed, 880 insertions, 0 deletions

diff --git a/runit/svlogd.c b/runit/svlogd.c
new file mode 100644
index 000000000..8e012d239
--- /dev/null
+++ b/runit/svlogd.c
@@ -0,0 +1,880 @@
+/*
+Copyright (c) 2001-2006, Gerrit Pape
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+   3. The name of the author may not be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
+/* TODO: depends on runit_lib.c - review and reduce/eliminate */
+
+#include <sys/poll.h>
+#include <sys/file.h>
+#include "busybox.h"
+#include "runit_lib.h"
+
+static unsigned verbose;
+static int linemax = 1000;
+static int buflen = 1024;
+static int linelen;
+
+static char **fndir;
+static int fdwdir;
+static int wstat;
+static struct taia trotate;
+
+static char *line;
+static unsigned exitasap;
+static unsigned rotateasap;
+static unsigned reopenasap;
+static unsigned linecomplete = 1;
+static unsigned tmaxflag;
+static iopause_fd in;
+
+static const char *replace = "";
+static char repl;
+
+static struct logdir {
+	char *btmp;
+	/* pattern list to match, in "aa\0bb\0\cc\0\0" form */
+	char *inst;
+	char *processor;
+	char *name;
+	unsigned size;
+	unsigned sizemax;
+	unsigned nmax;
+	unsigned nmin;
+	/* int (not long) because of taia_uint() usage: */
+	unsigned tmax;
+	int ppid;
+	int fddir;
+	int fdcur;
+	int fdlock;
+	struct taia trotate;
+	char fnsave[FMT_PTIME];
+	char match;
+	char matcherr;
+} *dir;
+static unsigned dirn = 0;
+
+#define FATAL "fatal: "
+#define WARNING "warning: "
+#define PAUSE "pausing: "
+#define INFO "info: "
+
+#define usage() bb_show_usage()
+static void fatalx(char *m0)
+{
+	bb_error_msg_and_die(FATAL"%s", m0);
+}
+static void warn(char *m0) {
+	bb_perror_msg(WARNING"%s", m0);
+}
+static void warn2(char *m0, char *m1)
+{
+	bb_perror_msg(WARNING"%s: %s", m0, m1);
+}
+static void warnx(char *m0, char *m1)
+{
+	bb_error_msg(WARNING"%s: %s", m0, m1);
+}
+static void pause_nomem(void)
+{
+	bb_error_msg(PAUSE"out of memory"); sleep(3);
+}
+static void pause1cannot(char *m0)
+{
+	bb_perror_msg(PAUSE"cannot %s", m0); sleep(3);
+}
+static void pause2cannot(char *m0, char *m1)
+{
+	bb_perror_msg(PAUSE"cannot %s %s", m0, m1);
+	sleep(3);
+}
+
+static char* wstrdup(const char *str)
+{
+	char *s;
+	while (!(s = strdup(str))) pause_nomem();
+	return s;
+}
+
+static unsigned processorstart(struct logdir *ld)
+{
+	int pid;
+
+	if (!ld->processor) return 0;
+	if (ld->ppid) {
+		warnx("processor already running", ld->name);
+		return 0;
+	}
+	while ((pid = fork()) == -1)
+		pause2cannot("fork for processor", ld->name);
+	if (!pid) {
+		char *prog[4];
+		int fd;
+
+		/* child */
+		sig_uncatch(sig_term);
+		sig_uncatch(sig_alarm);
+		sig_uncatch(sig_hangup);
+		sig_unblock(sig_term);
+		sig_unblock(sig_alarm);
+		sig_unblock(sig_hangup);
+		
+		if (verbose)
+			bb_error_msg(INFO"processing: %s/%s", ld->name, ld->fnsave);
+		fd = xopen(ld->fnsave, O_RDONLY|O_NDELAY);
+		if (fd_move(0, fd) == -1)
+			bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+		ld->fnsave[26] = 't';
+		fd = xopen3(ld->fnsave, O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT, 0644);
+		if (fd_move(1, fd) == -1)
+			bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+		fd = open_read("state");
+		if (fd == -1) {
+			if (errno != ENOENT)
+				bb_perror_msg_and_die(FATAL"cannot %s processor %s", "open state for", ld->name);
+			close(xopen3("state", O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT, 0644));
+			fd = xopen("state", O_RDONLY|O_NDELAY);
+		}
+		if (fd_move(4, fd) == -1)
+			bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+		fd = xopen3("newstate", O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT, 0644);
+		if (fd_move(5, fd) == -1)
+			bb_perror_msg_and_die(FATAL"cannot %s processor %s", "move filedescriptor for", ld->name);
+
+		prog[0] = "sh";
+		prog[1] = "-c";
+		prog[2] = ld->processor;
+		prog[3] = '\0';
+		execve("/bin/sh", prog, environ);
+		bb_perror_msg_and_die(FATAL"cannot %s processor %s", "run", ld->name);
+	}
+	ld->ppid = pid;
+	return 1;
+}
+
+static unsigned processorstop(struct logdir *ld)
+{
+	char f[28];
+
+	if (ld->ppid) {
+		sig_unblock(sig_hangup);
+		while (wait_pid(&wstat, ld->ppid) == -1)
+			pause2cannot("wait for processor", ld->name);
+		sig_block(sig_hangup);
+		ld->ppid = 0;
+	}
+	if (ld->fddir == -1) return 1;
+	while (fchdir(ld->fddir) == -1)
+		pause2cannot("change directory, want processor", ld->name);
+	if (wait_exitcode(wstat) != 0) {
+		warnx("processor failed, restart", ld->name);
+		ld->fnsave[26] = 't';
+		unlink(ld->fnsave);
+		ld->fnsave[26] = 'u';
+		processorstart(ld);
+		while (fchdir(fdwdir) == -1)
+			pause1cannot("change to initial working directory");
+		return ld->processor ? 0 : 1;
+	}
+	ld->fnsave[26] = 't';
+	memcpy(f, ld->fnsave, 26);
+	f[26] = 's';
+	f[27] = '\0';
+	while (rename(ld->fnsave, f) == -1)
+		pause2cannot("rename processed", ld->name);
+	while (chmod(f, 0744) == -1)
+		pause2cannot("set mode of processed", ld->name);
+	ld->fnsave[26] = 'u';
+	if (unlink(ld->fnsave) == -1)
+		bb_error_msg(WARNING"cannot unlink: %s/%s", ld->name, ld->fnsave);
+	while (rename("newstate", "state") == -1)
+		pause2cannot("rename state", ld->name);
+	if (verbose) bb_error_msg(INFO"processed: %s/%s", ld->name, f);
+	while (fchdir(fdwdir) == -1)
+		pause1cannot("change to initial working directory");
+	return 1;
+}
+
+static void rmoldest(struct logdir *ld)
+{
+	DIR *d;
+	struct dirent *f;
+	char oldest[FMT_PTIME];
+	int n = 0;
+
+	oldest[0] = 'A'; oldest[1] = oldest[27] = 0;
+	while (!(d = opendir(".")))
+		pause2cannot("open directory, want rotate", ld->name);
+	errno = 0;
+	while ((f = readdir(d))) {
+		if ((f->d_name[0] == '@') && (strlen(f->d_name) == 27)) {
+			if (f->d_name[26] == 't') {
+				if (unlink(f->d_name) == -1)
+					warn2("cannot unlink processor leftover", f->d_name);
+			} else {
+				++n;
+				if (strcmp(f->d_name, oldest) < 0)
+					memcpy(oldest, f->d_name, 27);
+			}
+			errno = 0;
+		}
+	}
+	if (errno) warn2("cannot read directory", ld->name);
+	closedir(d);
+
+	if (ld->nmax && (n > ld->nmax)) {
+		if (verbose) bb_error_msg(INFO"delete: %s/%s", ld->name, oldest);
+		if ((*oldest == '@') && (unlink(oldest) == -1))
+			warn2("cannot unlink oldest logfile", ld->name);
+	}
+}
+
+static unsigned rotate(struct logdir *ld)
+{
+	struct stat st;
+	struct taia now;
+
+	if (ld->fddir == -1) {
+		ld->tmax = 0;
+		return 0;
+	}
+	if (ld->ppid)
+		while(!processorstop(ld))
+			/* wait */;
+
+	while (fchdir(ld->fddir) == -1)
+		pause2cannot("change directory, want rotate", ld->name);
+
+	/* create new filename */
+	ld->fnsave[25] = '.';
+	ld->fnsave[26] = 's';
+	if (ld->processor)
+		ld->fnsave[26] = 'u';
+	ld->fnsave[27] = '\0';
+	do {
+		taia_now(&now);
+		fmt_taia(ld->fnsave, &now);
+		errno = 0;
+	} while ((stat(ld->fnsave, &st) != -1) || (errno != ENOENT));
+
+	if (ld->tmax && taia_less(&ld->trotate, &now)) {
+		taia_uint(&ld->trotate, ld->tmax);
+		taia_add(&ld->trotate, &now, &ld->trotate);
+		if (taia_less(&ld->trotate, &trotate))
+			trotate = ld->trotate;
+	}
+
+	if (ld->size > 0) {
+		while (fsync(ld->fdcur) == -1)
+			pause2cannot("fsync current logfile", ld->name);
+		while (fchmod(ld->fdcur, 0744) == -1)
+			pause2cannot("set mode of current", ld->name);
+		close(ld->fdcur);
+		if (verbose) {
+			bb_error_msg(INFO"rename: %s/current %s %u", ld->name,
+					ld->fnsave, ld->size);
+		}
+		while (rename("current", ld->fnsave) == -1)
+			pause2cannot("rename current", ld->name);
+		while ((ld->fdcur = open("current", O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600)) == -1)
+			pause2cannot("create new current", ld->name);
+		coe(ld->fdcur);
+		ld->size = 0;
+		while (fchmod(ld->fdcur, 0644) == -1)
+			pause2cannot("set mode of current", ld->name);
+		rmoldest(ld);
+		processorstart(ld);
+	}
+
+	while (fchdir(fdwdir) == -1)
+		pause1cannot("change to initial working directory");
+	return 1;
+}
+
+static int buffer_pwrite(int n, char *s, unsigned len)
+{
+	int i;
+	struct logdir *ld = &dir[n];
+
+	if (ld->sizemax) {
+		if (ld->size >= ld->sizemax)
+			rotate(ld);
+		if (len > (ld->sizemax - ld->size))
+			len = ld->sizemax - ld->size;
+	}
+	while ((i = write(ld->fdcur, s, len)) == -1) {
+		if ((errno == ENOSPC) && (ld->nmin < ld->nmax)) {
+			DIR *d;
+			struct dirent *f;
+			char oldest[FMT_PTIME];
+			int j = 0;
+
+			while (fchdir(ld->fddir) == -1)
+				pause2cannot("change directory, want remove old logfile",
+							 ld->name);
+			oldest[0] = 'A';
+			oldest[1] = oldest[27] = '\0';
+			while (!(d = opendir(".")))
+				pause2cannot("open directory, want remove old logfile",
+							 ld->name);
+			errno = 0;
+			while ((f = readdir(d)))
+				if ((f->d_name[0] == '@') && (strlen(f->d_name) == 27)) {
+					++j;
+					if (strcmp(f->d_name, oldest) < 0)
+						memcpy(oldest, f->d_name, 27);
+				}
+			if (errno) warn2("cannot read directory, want remove old logfile",
+					ld->name);
+			closedir(d);
+			errno = ENOSPC;
+			if (j > ld->nmin) {
+				if (*oldest == '@') {
+					bb_error_msg(WARNING"out of disk space, delete: %s/%s",
+							ld->name, oldest);
+					errno = 0;
+					if (unlink(oldest) == -1) {
+						warn2("cannot unlink oldest logfile", ld->name);
+						errno = ENOSPC;
+					}
+					while (fchdir(fdwdir) == -1)
+						pause1cannot("change to initial working directory");
+				}
+			}
+		}
+		if (errno) pause2cannot("write to current", ld->name);
+	}
+
+	ld->size += i;
+	if (ld->sizemax)
+		if (s[i-1] == '\n')
+			if (ld->size >= (ld->sizemax - linemax))
+				rotate(ld);
+	return i;
+}
+
+static void logdir_close(struct logdir *ld)
+{
+	if (ld->fddir == -1)
+		return;
+	if (verbose)
+		bb_error_msg(INFO"close: %s", ld->name);
+	close(ld->fddir);
+	ld->fddir = -1;
+	if (ld->fdcur == -1)
+		return; /* impossible */
+	while (fsync(ld->fdcur) == -1)
+		pause2cannot("fsync current logfile", ld->name);
+	while (fchmod(ld->fdcur, 0744) == -1)
+		pause2cannot("set mode of current", ld->name);
+	close(ld->fdcur);
+	ld->fdcur = -1;
+	if (ld->fdlock == -1)
+		return; /* impossible */
+	close(ld->fdlock);
+	ld->fdlock = -1;
+	free(ld->processor);
+	ld->processor = NULL;
+}
+
+static unsigned logdir_open(struct logdir *ld, const char *fn)
+{
+	char buf[128];
+	struct taia now;
+	char *new, *s, *np;
+	int i;
+	struct stat st;
+
+	ld->fddir = open(fn, O_RDONLY|O_NDELAY);
+	if (ld->fddir == -1) {
+		warn2("cannot open log directory", (char*)fn);
+		return 0;
+	}
+	coe(ld->fddir);
+	if (fchdir(ld->fddir) == -1) {
+		logdir_close(ld);
+		warn2("cannot change directory", (char*)fn);
+		return 0;
+	}
+	ld->fdlock = open("lock", O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
+	if ((ld->fdlock == -1)
+	 || (lock_exnb(ld->fdlock) == -1)
+	) {
+		logdir_close(ld);
+		warn2("cannot lock directory", (char*)fn);
+		while (fchdir(fdwdir) == -1)
+			pause1cannot("change to initial working directory");
+		return 0;
+	}
+	coe(ld->fdlock);
+
+	ld->size = 0;
+	ld->sizemax = 1000000;
+	ld->nmax = ld->nmin = 10;
+	ld->tmax = 0;
+	ld->name = (char*)fn;
+	ld->ppid = 0;
+	ld->match = '+';
+	free(ld->inst); ld->inst = NULL;
+	free(ld->processor); ld->processor = NULL;
+
+	/* read config */
+	i = open_read_close("config", buf, sizeof(buf));
+	if (i < 0)
+		warn2("cannot read config", ld->name);
+	if (i > 0) {
+		if (verbose) bb_error_msg(INFO"read: %s/config", ld->name);
+		s = buf;
+		while (s) {
+			np = strchr(s, '\n');
+			if (np) *np++ = '\0';
+			switch (s[0]) {
+			case '+':
+			case '-':
+			case 'e':
+			case 'E':
+				while (1) {
+					int l = asprintf(&new, "%s%s\n", ld->inst?:"", s);
+					if (l >= 0 && new) break;
+					pause_nomem();
+				}
+				free(ld->inst);
+				ld->inst = new;
+				break;
+			case 's': {
+				static const struct suffix_mult km_suffixes[] = {
+						{ "k", 1024 },
+						{ "m", 1024*1024 },
+						{ NULL, 0 }
+				};
+				ld->sizemax = xatou_sfx(&s[1], km_suffixes);
+				break;
+			}
+			case 'n':
+				ld->nmax = xatoi_u(&s[1]);
+				break;
+			case 'N':
+				ld->nmin = xatoi_u(&s[1]);
+				break;
+			case 't': {
+				static const struct suffix_mult mh_suffixes[] = {
+						{ "m", 60 },
+						{ "h", 60*60 },
+						/*{ "d", 24*60*60 },*/
+						{ NULL, 0 }
+				};
+				ld->tmax = xatou_sfx(&s[1], mh_suffixes);
+				if (ld->tmax) {
+					taia_uint(&ld->trotate, ld->tmax);
+					taia_add(&ld->trotate, &now, &ld->trotate);
+					if (!tmaxflag || taia_less(&ld->trotate, &trotate))
+						trotate = ld->trotate;
+					tmaxflag = 1;
+				}
+				break;
+			}
+			case '!':
+				if (s[1]) {
+					free(ld->processor);
+					ld->processor = wstrdup(s);
+				}
+				break;
+			}
+			s = np;
+		}
+		/* Convert "aa\nbb\ncc\n\0" to "aa\0bb\0cc\0\0" */
+		s = ld->inst;
+		while (s) {
+			np = strchr(s, '\n');
+			if (np) *np++ = '\0';
+			s = np;
+		}
+	}
+
+	/* open current */
+	i = stat("current", &st);
+	if (i != -1) {
+		if (st.st_size && ! (st.st_mode & S_IXUSR)) {
+			ld->fnsave[25] = '.';
+			ld->fnsave[26] = 'u';
+			ld->fnsave[27] = '\0';
+			do {
+				taia_now(&now);
+				fmt_taia(ld->fnsave, &now);
+				errno = 0;
+			} while ((stat(ld->fnsave, &st) != -1) || (errno != ENOENT));
+			while (rename("current", ld->fnsave) == -1)
+				pause2cannot("rename current", ld->name);
+			rmoldest(ld);
+			i = -1;
+		} else {
+			/* Be paranoid: st.st_size can be not just bigger, but WIDER! */
+			/* (bug in original svlogd. remove this comment when fixed there) */
+			ld->size = (st.st_size > ld->sizemax) ? ld->sizemax : st.st_size;
+		}
+	} else {
+		if (errno != ENOENT) {
+			logdir_close(ld);
+			warn2("cannot stat current", ld->name);
+			while (fchdir(fdwdir) == -1)
+				pause1cannot("change to initial working directory");
+			return 0;
+		}
+	}
+	while ((ld->fdcur = open("current", O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600)) == -1)
+		pause2cannot("open current", ld->name);
+	coe(ld->fdcur);
+	while (fchmod(ld->fdcur, 0644) == -1)
+		pause2cannot("set mode of current", ld->name);
+	
+	if (verbose) {
+		if (i == 0) bb_error_msg(INFO"append: %s/current", ld->name);
+		else bb_error_msg(INFO"new: %s/current", ld->name);
+	}
+	
+	while (fchdir(fdwdir) == -1)
+		pause1cannot("change to initial working directory");
+	return 1;
+}
+
+static void logdirs_reopen(void)
+{
+	struct taia now;
+	int l;
+	int ok = 0;
+
+	tmaxflag = 0;
+	taia_now(&now);
+	for (l = 0; l < dirn; ++l) {
+		logdir_close(&dir[l]);    
+		if (logdir_open(&dir[l], fndir[l])) ok = 1;
+	}
+	if (!ok) fatalx("no functional log directories");
+}
+
+/* Used for reading stdin */
+static int buffer_pread(int fd, char *s, unsigned len)
+{
+	struct taia now;
+	int i;
+
+	if (rotateasap) {
+		for (i = 0; i < dirn; ++i)
+			rotate(dir+i);
+		rotateasap = 0;
+	}
+	if (exitasap) {
+		if (linecomplete)
+			return 0;
+		len = 1;
+	}
+	if (reopenasap) {
+		logdirs_reopen();
+		reopenasap = 0;
+	}
+	taia_now(&now);
+	taia_uint(&trotate, 2744);
+	taia_add(&trotate, &now, &trotate);
+	for (i = 0; i < dirn; ++i)
+		if (dir[i].tmax) {
+			if (taia_less(&dir[i].trotate, &now))
+				rotate(dir+i);
+			if (taia_less(&dir[i].trotate, &trotate))
+				trotate = dir[i].trotate;
+		}
+
+	while (1) {
+		/* Comment? */
+		sig_unblock(sig_term);
+		sig_unblock(sig_child);
+		sig_unblock(sig_alarm);
+		sig_unblock(sig_hangup);
+		iopause(&in, 1, &trotate, &now);
+		sig_block(sig_term);
+		sig_block(sig_child);
+		sig_block(sig_alarm);
+		sig_block(sig_hangup);
+		i = safe_read(fd, s, len);
+		if (i >= 0) break;
+		if (errno != EAGAIN) {
+			warn("cannot read standard input");
+			break;
+		}
+		/* else: EAGAIN - normal, repeat silently */
+	}
+
+	if (i > 0) {
+		int cnt;
+		linecomplete = (s[i-1] == '\n');
+		if (!repl) return i;
+
+		cnt = i;
+		while (--cnt >= 0) {
+			char ch = *s;
+			if (ch != '\n') {
+				if (ch < 32 || ch > 126)
+					*s = repl;
+				else {
+					int j;
+					for (j = 0; replace[j]; ++j) {
+						if (ch == replace[j]) {
+							*s = repl;
+							break;
+						}
+					}
+				}
+			}
+			s++;
+		}
+	}
+	return i;
+}
+
+
+static void sig_term_handler(int sig_no)
+{
+	if (verbose)
+		bb_error_msg(INFO"sig%s received", "term");
+	exitasap = 1;
+}
+
+static void sig_child_handler(int sig_no)
+{
+	int pid, l;
+
+	if (verbose)
+		bb_error_msg(INFO"sig%s received", "child");
+	while ((pid = wait_nohang(&wstat)) > 0)
+		for (l = 0; l < dirn; ++l)
+			if (dir[l].ppid == pid) {
+				dir[l].ppid = 0;
+				processorstop(&dir[l]);
+				break;
+			}
+}
+
+static void sig_alarm_handler(int sig_no)
+{
+	if (verbose)
+		bb_error_msg(INFO"sig%s received", "alarm");
+	rotateasap = 1;
+}
+
+static void sig_hangup_handler(int sig_no)
+{
+	if (verbose)
+		bb_error_msg(INFO"sig%s received", "hangup");
+	reopenasap = 1;
+}
+
+static void logmatch(struct logdir *ld)
+{
+	char *s;
+
+	ld->match = '+';
+	ld->matcherr = 'E';
+	s = ld->inst;
+	while (s && s[0]) {
+		switch (s[0]) {
+		case '+':
+		case '-':
+			if (pmatch(s+1, line, linelen))
+				ld->match = s[0];
+			break;
+		case 'e':
+		case 'E':
+			if (pmatch(s+1, line, linelen))
+				ld->matcherr = s[0];
+			break;
+		}
+		s += strlen(s) + 1;
+	}
+}
+
+int svlogd_main(int argc, char **argv)
+{
+	struct taia now;
+	char *r,*l,*b;
+	ssize_t stdin_cnt = 0;
+	int i;
+	unsigned opt;
+	unsigned timestamp = 0;
+
+	opt_complementary = "tt:vv";
+	opt = getopt32(argc, argv, "r:R:l:b:tv",
+			&r, &replace, &l, &b, &timestamp, &verbose);
+	if (opt & 1) { // -r
+		repl = r[0];
+		if (!repl || r[1]) usage();
+	}
+	if (opt & 2) if (!repl) repl = '_'; // -R
+	if (opt & 4) { // -l
+		linemax = xatou_range(l, 0, 1000);
+		if (linemax == 0) linemax = 1000;
+		if (linemax < 256) linemax = 256;
+	}
+	if (opt & 8) { // -b
+		buflen = xatoi_u(b);
+		if (buflen == 0) buflen = 1024;
+	}
+	//if (opt & 0x10) timestamp++; // -t
+	//if (opt & 0x20) verbose++; // -v
+	if (timestamp > 2) timestamp = 2;
+	argv += optind;
+	argc -= optind;
+
+	dirn = argc;
+	if (dirn <= 0) usage();
+	if (buflen <= linemax) usage();
+	fdwdir = xopen(".", O_RDONLY|O_NDELAY);
+	coe(fdwdir);
+	dir = xmalloc(dirn * sizeof(struct logdir));
+	for (i = 0; i < dirn; ++i) {
+		dir[i].fddir = -1;
+		dir[i].fdcur = -1;
+		dir[i].btmp = xmalloc(buflen);
+		dir[i].ppid = 0;
+	}
+	line = xmalloc(linemax + (timestamp ? 26 : 0));
+	fndir = argv;
+	in.fd = 0;
+	in.events = IOPAUSE_READ;
+	ndelay_on(in.fd);
+
+	sig_block(sig_term);
+	sig_block(sig_child);
+	sig_block(sig_alarm);
+	sig_block(sig_hangup);
+	sig_catch(sig_term, sig_term_handler);
+	sig_catch(sig_child, sig_child_handler);
+	sig_catch(sig_alarm, sig_alarm_handler);
+	sig_catch(sig_hangup, sig_hangup_handler);
+
+	logdirs_reopen();
+
+	/* Each iteration processes one line */
+	while (1) {
+		int printlen;
+		char *lineptr = line;
+		char *np;
+		char ch;
+
+		/* Prepare timestamp if needed */
+		if (timestamp) {
+			char stamp[FMT_PTIME];
+			taia_now(&now);
+			switch (timestamp) {
+			case 1:
+				fmt_taia(stamp, &now);
+				break;
+			default: /* case 2: */
+				fmt_ptime(stamp, &now);
+				break;
+			}
+			memcpy(line, stamp, 25);
+			line[25] = ' ';
+			lineptr += 26;
+		}
+
+		/* lineptr[0..linemax-1] - buffer for stdin */
+		/* (possibly has some unprocessed data from prev loop) */
+
+		/* Refill the buffer if needed */
+		np = memchr(lineptr, '\n', stdin_cnt);
+		i = linemax - stdin_cnt; /* avail. bytes at tail */
+		if (i >= 128 && !exitasap && !np) {
+			int sz = buffer_pread(0, lineptr + stdin_cnt, i);
+			if (sz <= 0) /* EOF or error on stdin */
+				exitasap = 1;
+			else {
+				stdin_cnt += sz;
+				np = memchr(lineptr, '\n', stdin_cnt);
+			}
+		}
+		if (stdin_cnt <= 0 && exitasap)
+			break;
+
+		/* Search for '\n' (in fact, np already holds the result) */
+		linelen = stdin_cnt;
+		if (np) linelen = np - lineptr + 1;
+		/* linelen == no of chars incl. '\n' (or == stdin_cnt) */
+		ch = lineptr[linelen-1];
+
+		printlen = linelen + (timestamp ? 26 : 0);
+		/* write out line[0..printlen-1] to each log destination */
+		for (i = 0; i < dirn; ++i) {
+			struct logdir *ld = &dir[i];
+			if (ld->fddir == -1) continue;
+			if (ld->inst)
+				logmatch(ld);
+			if (ld->matcherr == 'e') {
+				fprintf(stderr, "%.*s%s",
+						printlen, line,
+						(ch != '\n') ? "...\n" : ""
+				);
+			}
+			if (ld->match != '+') continue;
+			buffer_pwrite(i, line, printlen);
+		}
+
+		/* If we didn't see '\n' (long input line), */
+		/* read/write repeatedly until we see it */
+		while (ch != '\n') {
+			/* lineptr is emptied now, safe to use as buffer */
+			stdin_cnt = exitasap ? -1 : buffer_pread(0, lineptr, linemax);
+			if (stdin_cnt <= 0) { /* EOF or error on stdin */
+				lineptr[0] = ch = '\n';
+				linelen = 1;
+				exitasap = 1;
+				stdin_cnt = 1;
+			} else {
+				linelen = stdin_cnt;
+				np = memchr(lineptr, '\n', stdin_cnt);
+				if (np) linelen = np - lineptr + 1;
+				ch = lineptr[linelen-1];
+			}
+			/* linelen == no of chars incl. '\n' (or == stdin_cnt) */
+			for (i = 0; i < dirn; ++i) {
+				if (dir[i].fddir == -1) continue;
+				if (dir[i].match != '+') continue;
+				buffer_pwrite(i, lineptr, linelen);
+			}
+		}
+
+		/* Move unprocessed data to the front of line */
+		stdin_cnt -= linelen;
+		if (stdin_cnt > 0) /* TODO: slow if buffer is big */
+			memmove(lineptr, &lineptr[linelen], stdin_cnt);
+	}
+
+	for (i = 0; i < dirn; ++i) {
+		if (dir[i].ppid)
+			while (!processorstop(&dir[i]))
+				/* repeat */;
+		logdir_close(&dir[i]);
+	}
+	_exit(0);
+}