xref: /freebsd/usr.bin/tail/forward.c (revision 76628ce773bf1b5fc444cc38f3490da4b4d1960f)
19b50d902SRodney W. Grimes /*-
29b50d902SRodney W. Grimes  * Copyright (c) 1991, 1993
39b50d902SRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
49b50d902SRodney W. Grimes  *
59b50d902SRodney W. Grimes  * This code is derived from software contributed to Berkeley by
69b50d902SRodney W. Grimes  * Edward Sze-Tyan Wang.
79b50d902SRodney W. Grimes  *
89b50d902SRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
99b50d902SRodney W. Grimes  * modification, are permitted provided that the following conditions
109b50d902SRodney W. Grimes  * are met:
119b50d902SRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
129b50d902SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
139b50d902SRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
149b50d902SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
159b50d902SRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
169b50d902SRodney W. Grimes  * 3. All advertising materials mentioning features or use of this software
179b50d902SRodney W. Grimes  *    must display the following acknowledgement:
189b50d902SRodney W. Grimes  *	This product includes software developed by the University of
199b50d902SRodney W. Grimes  *	California, Berkeley and its contributors.
209b50d902SRodney W. Grimes  * 4. Neither the name of the University nor the names of its contributors
219b50d902SRodney W. Grimes  *    may be used to endorse or promote products derived from this software
229b50d902SRodney W. Grimes  *    without specific prior written permission.
239b50d902SRodney W. Grimes  *
249b50d902SRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
259b50d902SRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
269b50d902SRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
279b50d902SRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
289b50d902SRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
299b50d902SRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
309b50d902SRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
319b50d902SRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
329b50d902SRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
339b50d902SRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
349b50d902SRodney W. Grimes  * SUCH DAMAGE.
359b50d902SRodney W. Grimes  */
369b50d902SRodney W. Grimes 
37814e3a92SMark Murray #include <sys/cdefs.h>
38814e3a92SMark Murray 
39814e3a92SMark Murray __FBSDID("$FreeBSD$");
40814e3a92SMark Murray 
419b50d902SRodney W. Grimes #ifndef lint
42814e3a92SMark Murray static const char sccsid[] = "@(#)forward.c	8.1 (Berkeley) 6/6/93";
43247e7cb1SJeroen Ruigrok van der Werven #endif
449b50d902SRodney W. Grimes 
459b50d902SRodney W. Grimes #include <sys/types.h>
469b50d902SRodney W. Grimes #include <sys/stat.h>
479b50d902SRodney W. Grimes #include <sys/time.h>
489b50d902SRodney W. Grimes #include <sys/mman.h>
4932462e82SJonathan Lemon #include <sys/event.h>
509b50d902SRodney W. Grimes 
51814e3a92SMark Murray #include <err.h>
529b50d902SRodney W. Grimes #include <errno.h>
53814e3a92SMark Murray #include <fcntl.h>
54814e3a92SMark Murray #include <limits.h>
559b50d902SRodney W. Grimes #include <stdio.h>
569b50d902SRodney W. Grimes #include <stdlib.h>
579b50d902SRodney W. Grimes #include <string.h>
58814e3a92SMark Murray #include <unistd.h>
59814e3a92SMark Murray 
609b50d902SRodney W. Grimes #include "extern.h"
619b50d902SRodney W. Grimes 
623f330d7dSWarner Losh static void rlines(FILE *, off_t, struct stat *);
63a2fb00d9SDavid Malone static void show(file_info_t *);
64a2fb00d9SDavid Malone static void set_events(file_info_t *files);
659b50d902SRodney W. Grimes 
66ea9bd2dfSJonathan Lemon /* defines for inner loop actions */
67ea9bd2dfSJonathan Lemon #define USE_SLEEP	0
68ea9bd2dfSJonathan Lemon #define USE_KQUEUE	1
69ea9bd2dfSJonathan Lemon #define ADD_EVENTS	2
70ea9bd2dfSJonathan Lemon 
7115a55f79SPaul Richards struct kevent *ev;
7215a55f79SPaul Richards int action = USE_SLEEP;
7315a55f79SPaul Richards int kq;
7415a55f79SPaul Richards 
7576628ce7SXin LI static const file_info_t *last;
7676628ce7SXin LI 
779b50d902SRodney W. Grimes /*
789b50d902SRodney W. Grimes  * forward -- display the file, from an offset, forward.
799b50d902SRodney W. Grimes  *
809b50d902SRodney W. Grimes  * There are eight separate cases for this -- regular and non-regular
819b50d902SRodney W. Grimes  * files, by bytes or lines and from the beginning or end of the file.
829b50d902SRodney W. Grimes  *
839b50d902SRodney W. Grimes  * FBYTES	byte offset from the beginning of the file
849b50d902SRodney W. Grimes  *	REG	seek
859b50d902SRodney W. Grimes  *	NOREG	read, counting bytes
869b50d902SRodney W. Grimes  *
879b50d902SRodney W. Grimes  * FLINES	line offset from the beginning of the file
889b50d902SRodney W. Grimes  *	REG	read, counting lines
899b50d902SRodney W. Grimes  *	NOREG	read, counting lines
909b50d902SRodney W. Grimes  *
919b50d902SRodney W. Grimes  * RBYTES	byte offset from the end of the file
929b50d902SRodney W. Grimes  *	REG	seek
939b50d902SRodney W. Grimes  *	NOREG	cyclically read characters into a wrap-around buffer
949b50d902SRodney W. Grimes  *
959b50d902SRodney W. Grimes  * RLINES
969b50d902SRodney W. Grimes  *	REG	mmap the file and step back until reach the correct offset.
979b50d902SRodney W. Grimes  *	NOREG	cyclically read lines into a wrap-around array of buffers
989b50d902SRodney W. Grimes  */
999b50d902SRodney W. Grimes void
1004bba8e59SPaul Richards forward(FILE *fp, enum STYLE style, off_t off, struct stat *sbp)
1019b50d902SRodney W. Grimes {
102a2fb00d9SDavid Malone 	int ch;
1039b50d902SRodney W. Grimes 
1049b50d902SRodney W. Grimes 	switch(style) {
1059b50d902SRodney W. Grimes 	case FBYTES:
1069b50d902SRodney W. Grimes 		if (off == 0)
1079b50d902SRodney W. Grimes 			break;
1089b50d902SRodney W. Grimes 		if (S_ISREG(sbp->st_mode)) {
1099b50d902SRodney W. Grimes 			if (sbp->st_size < off)
1109b50d902SRodney W. Grimes 				off = sbp->st_size;
111bd9dc975SAndrey A. Chernov 			if (fseeko(fp, off, SEEK_SET) == -1) {
1129b50d902SRodney W. Grimes 				ierr();
1139b50d902SRodney W. Grimes 				return;
1149b50d902SRodney W. Grimes 			}
1159b50d902SRodney W. Grimes 		} else while (off--)
1169b50d902SRodney W. Grimes 			if ((ch = getc(fp)) == EOF) {
1179b50d902SRodney W. Grimes 				if (ferror(fp)) {
1189b50d902SRodney W. Grimes 					ierr();
1199b50d902SRodney W. Grimes 					return;
1209b50d902SRodney W. Grimes 				}
1219b50d902SRodney W. Grimes 				break;
1229b50d902SRodney W. Grimes 			}
1239b50d902SRodney W. Grimes 		break;
1249b50d902SRodney W. Grimes 	case FLINES:
1259b50d902SRodney W. Grimes 		if (off == 0)
1269b50d902SRodney W. Grimes 			break;
1279b50d902SRodney W. Grimes 		for (;;) {
1289b50d902SRodney W. Grimes 			if ((ch = getc(fp)) == EOF) {
1299b50d902SRodney W. Grimes 				if (ferror(fp)) {
1309b50d902SRodney W. Grimes 					ierr();
1319b50d902SRodney W. Grimes 					return;
1329b50d902SRodney W. Grimes 				}
1339b50d902SRodney W. Grimes 				break;
1349b50d902SRodney W. Grimes 			}
1359b50d902SRodney W. Grimes 			if (ch == '\n' && !--off)
1369b50d902SRodney W. Grimes 				break;
1379b50d902SRodney W. Grimes 		}
1389b50d902SRodney W. Grimes 		break;
1399b50d902SRodney W. Grimes 	case RBYTES:
1409b50d902SRodney W. Grimes 		if (S_ISREG(sbp->st_mode)) {
1419b50d902SRodney W. Grimes 			if (sbp->st_size >= off &&
142bd9dc975SAndrey A. Chernov 			    fseeko(fp, -off, SEEK_END) == -1) {
1439b50d902SRodney W. Grimes 				ierr();
1449b50d902SRodney W. Grimes 				return;
1459b50d902SRodney W. Grimes 			}
1469b50d902SRodney W. Grimes 		} else if (off == 0) {
1479b50d902SRodney W. Grimes 			while (getc(fp) != EOF);
1489b50d902SRodney W. Grimes 			if (ferror(fp)) {
1499b50d902SRodney W. Grimes 				ierr();
1509b50d902SRodney W. Grimes 				return;
1519b50d902SRodney W. Grimes 			}
1529b50d902SRodney W. Grimes 		} else
1536439f56eSAdam David 			if (bytes(fp, off))
1546439f56eSAdam David 				return;
1559b50d902SRodney W. Grimes 		break;
1569b50d902SRodney W. Grimes 	case RLINES:
1579b50d902SRodney W. Grimes 		if (S_ISREG(sbp->st_mode))
1589b50d902SRodney W. Grimes 			if (!off) {
159bd9dc975SAndrey A. Chernov 				if (fseeko(fp, (off_t)0, SEEK_END) == -1) {
1609b50d902SRodney W. Grimes 					ierr();
1619b50d902SRodney W. Grimes 					return;
1629b50d902SRodney W. Grimes 				}
1639b50d902SRodney W. Grimes 			} else
1649b50d902SRodney W. Grimes 				rlines(fp, off, sbp);
1659b50d902SRodney W. Grimes 		else if (off == 0) {
1669b50d902SRodney W. Grimes 			while (getc(fp) != EOF);
1679b50d902SRodney W. Grimes 			if (ferror(fp)) {
1689b50d902SRodney W. Grimes 				ierr();
1699b50d902SRodney W. Grimes 				return;
1709b50d902SRodney W. Grimes 			}
1719b50d902SRodney W. Grimes 		} else
1726439f56eSAdam David 			if (lines(fp, off))
1736439f56eSAdam David 				return;
1749b50d902SRodney W. Grimes 		break;
175814e3a92SMark Murray 	default:
176b77b9b9aSMurray Stokely 		break;
1779b50d902SRodney W. Grimes 	}
1789b50d902SRodney W. Grimes 
1799b50d902SRodney W. Grimes 	while ((ch = getc(fp)) != EOF)
1809b50d902SRodney W. Grimes 		if (putchar(ch) == EOF)
1819b50d902SRodney W. Grimes 			oerr();
1829b50d902SRodney W. Grimes 	if (ferror(fp)) {
1839b50d902SRodney W. Grimes 		ierr();
1849b50d902SRodney W. Grimes 		return;
1859b50d902SRodney W. Grimes 	}
1869b50d902SRodney W. Grimes 	(void)fflush(stdout);
1879b50d902SRodney W. Grimes }
1889b50d902SRodney W. Grimes 
1899b50d902SRodney W. Grimes /*
1909b50d902SRodney W. Grimes  * rlines -- display the last offset lines of the file.
1919b50d902SRodney W. Grimes  */
1929b50d902SRodney W. Grimes static void
1939b50d902SRodney W. Grimes rlines(fp, off, sbp)
1949b50d902SRodney W. Grimes 	FILE *fp;
195bd9dc975SAndrey A. Chernov 	off_t off;
1969b50d902SRodney W. Grimes 	struct stat *sbp;
1979b50d902SRodney W. Grimes {
198726098d3SDavid Malone 	struct mapinfo map;
199726098d3SDavid Malone 	off_t curoff, size;
200726098d3SDavid Malone 	int i;
2019b50d902SRodney W. Grimes 
2029b50d902SRodney W. Grimes 	if (!(size = sbp->st_size))
2039b50d902SRodney W. Grimes 		return;
204726098d3SDavid Malone 	map.start = NULL;
205726098d3SDavid Malone 	map.fd = fileno(fp);
206726098d3SDavid Malone 	map.mapoff = map.maxoff = size;
2079b50d902SRodney W. Grimes 
2086bea9ab4SAndrey A. Chernov 	/*
209726098d3SDavid Malone 	 * Last char is special, ignore whether newline or not. Note that
210726098d3SDavid Malone 	 * size == 0 is dealt with above, and size == 1 sets curoff to -1.
2116bea9ab4SAndrey A. Chernov 	 */
212726098d3SDavid Malone 	curoff = size - 2;
213726098d3SDavid Malone 	while (curoff >= 0) {
214726098d3SDavid Malone 		if (curoff < map.mapoff && maparound(&map, curoff) != 0) {
2159b50d902SRodney W. Grimes 			ierr();
2169b50d902SRodney W. Grimes 			return;
2179b50d902SRodney W. Grimes 		}
218726098d3SDavid Malone 		for (i = curoff - map.mapoff; i >= 0; i--)
219726098d3SDavid Malone 			if (map.start[i] == '\n' && --off == 0)
220726098d3SDavid Malone 				break;
221726098d3SDavid Malone 		/* `i' is either the map offset of a '\n', or -1. */
222726098d3SDavid Malone 		curoff = map.mapoff + i;
223726098d3SDavid Malone 		if (i >= 0)
224726098d3SDavid Malone 			break;
225726098d3SDavid Malone 	}
226726098d3SDavid Malone 	curoff++;
227726098d3SDavid Malone 	if (mapprint(&map, curoff, size - curoff) != 0) {
228726098d3SDavid Malone 		ierr();
229726098d3SDavid Malone 		exit(1);
230726098d3SDavid Malone 	}
231726098d3SDavid Malone 
232726098d3SDavid Malone 	/* Set the file pointer to reflect the length displayed. */
233a74da62eSAndrey A. Chernov 	if (fseeko(fp, sbp->st_size, SEEK_SET) == -1) {
234726098d3SDavid Malone 		ierr();
235726098d3SDavid Malone 		return;
236726098d3SDavid Malone 	}
237726098d3SDavid Malone 	if (map.start != NULL && munmap(map.start, map.maplen)) {
23844cf272fSAdam David 		ierr();
2399b50d902SRodney W. Grimes 		return;
2409b50d902SRodney W. Grimes 	}
2419b50d902SRodney W. Grimes }
24215a55f79SPaul Richards 
243a2fb00d9SDavid Malone static void
24415a55f79SPaul Richards show(file_info_t *file)
24515a55f79SPaul Richards {
2469e777bc6SBrian Somers     int ch;
24715a55f79SPaul Richards 
24815a55f79SPaul Richards     while ((ch = getc(file->fp)) != EOF) {
2499e777bc6SBrian Somers 	if (last != file && no_files > 1) {
25015a55f79SPaul Richards 		(void)printf("\n==> %s <==\n", file->file_name);
2519e777bc6SBrian Somers 		last = file;
25215a55f79SPaul Richards 	}
25315a55f79SPaul Richards 	if (putchar(ch) == EOF)
25415a55f79SPaul Richards 		oerr();
25515a55f79SPaul Richards     }
25615a55f79SPaul Richards     (void)fflush(stdout);
25715a55f79SPaul Richards     if (ferror(file->fp)) {
25815a55f79SPaul Richards 	    file->fp = NULL;
25915a55f79SPaul Richards 	    ierr();
26015a55f79SPaul Richards     } else
26115a55f79SPaul Richards 	    clearerr(file->fp);
26215a55f79SPaul Richards }
26315a55f79SPaul Richards 
264a2fb00d9SDavid Malone static void
26515a55f79SPaul Richards set_events(file_info_t *files)
26615a55f79SPaul Richards {
26715a55f79SPaul Richards 	int i, n = 0;
26815a55f79SPaul Richards 	file_info_t *file;
26915a55f79SPaul Richards 	struct timespec ts;
27015a55f79SPaul Richards 
27115a55f79SPaul Richards 	ts.tv_sec = 0;
27215a55f79SPaul Richards 	ts.tv_nsec = 0;
27315a55f79SPaul Richards 
27415a55f79SPaul Richards 	action = USE_KQUEUE;
27515a55f79SPaul Richards 	for (i = 0, file = files; i < no_files; i++, file++) {
27615a55f79SPaul Richards 		if (! file->fp)
27715a55f79SPaul Richards 			continue;
27815a55f79SPaul Richards 		if (Fflag && fileno(file->fp) != STDIN_FILENO) {
27915a55f79SPaul Richards 			EV_SET(&ev[n], fileno(file->fp), EVFILT_VNODE,
28015a55f79SPaul Richards 			    EV_ADD | EV_ENABLE | EV_CLEAR,
28115a55f79SPaul Richards 			    NOTE_DELETE | NOTE_RENAME, 0, 0);
28215a55f79SPaul Richards 			n++;
28315a55f79SPaul Richards 		}
28415a55f79SPaul Richards 		EV_SET(&ev[n], fileno(file->fp), EVFILT_READ,
28515a55f79SPaul Richards 		    EV_ADD | EV_ENABLE | EV_CLEAR, 0, 0, 0);
28615a55f79SPaul Richards 		n++;
28715a55f79SPaul Richards 	}
28815a55f79SPaul Richards 
28915a55f79SPaul Richards 	if (kevent(kq, ev, n, NULL, 0, &ts) < 0) {
29015a55f79SPaul Richards 		action = USE_SLEEP;
29115a55f79SPaul Richards 	}
29215a55f79SPaul Richards }
29315a55f79SPaul Richards 
29476628ce7SXin LI /*
29576628ce7SXin LI  * follow -- display the file, from an offset, forward.
29676628ce7SXin LI  *
29776628ce7SXin LI  */
29815a55f79SPaul Richards void
29915a55f79SPaul Richards follow(file_info_t *files, enum STYLE style, off_t off)
30015a55f79SPaul Richards {
30115a55f79SPaul Richards 	int active, i, n = -1;
30215a55f79SPaul Richards 	struct stat sb2;
30315a55f79SPaul Richards 	file_info_t *file;
30415a55f79SPaul Richards 	struct timespec ts;
30515a55f79SPaul Richards 
30615a55f79SPaul Richards 	/* Position each of the files */
30715a55f79SPaul Richards 
30815a55f79SPaul Richards 	file = files;
30915a55f79SPaul Richards 	active = 0;
31015a55f79SPaul Richards 	n = 0;
31115a55f79SPaul Richards 	for (i = 0; i < no_files; i++, file++) {
31215a55f79SPaul Richards 		if (file->fp) {
31315a55f79SPaul Richards 			active = 1;
31415a55f79SPaul Richards 			n++;
31515a55f79SPaul Richards 			if (no_files > 1)
31615a55f79SPaul Richards 				(void)printf("\n==> %s <==\n", file->file_name);
31715a55f79SPaul Richards 			forward(file->fp, style, off, &file->st);
31815a55f79SPaul Richards 			if (Fflag && fileno(file->fp) != STDIN_FILENO)
31915a55f79SPaul Richards 			    n++;
32015a55f79SPaul Richards 		}
32115a55f79SPaul Richards 	}
32215a55f79SPaul Richards 	if (! active)
32315a55f79SPaul Richards 		return;
32415a55f79SPaul Richards 
32576628ce7SXin LI 	last = --file;
32676628ce7SXin LI 
32715a55f79SPaul Richards 	kq = kqueue();
32815a55f79SPaul Richards 	if (kq < 0)
32915a55f79SPaul Richards 		err(1, "kqueue");
33015a55f79SPaul Richards 	ev = malloc(n * sizeof(struct kevent));
33115a55f79SPaul Richards 	if (! ev)
33215a55f79SPaul Richards 	    err(1, "Couldn't allocate memory for kevents.");
33315a55f79SPaul Richards 	set_events(files);
33415a55f79SPaul Richards 
33515a55f79SPaul Richards 	for (;;) {
33615a55f79SPaul Richards 		for (i = 0, file = files; i < no_files; i++, file++) {
33715a55f79SPaul Richards 			if (! file->fp)
33815a55f79SPaul Richards 				continue;
33915a55f79SPaul Richards 			if (Fflag && file->fp && fileno(file->fp) != STDIN_FILENO) {
34015a55f79SPaul Richards 				if (stat(file->file_name, &sb2) != 0) {
34115a55f79SPaul Richards 					/* file was rotated, skip it until it reappears */
34215a55f79SPaul Richards 					continue;
34315a55f79SPaul Richards 				}
34415a55f79SPaul Richards 				if (sb2.st_ino != file->st.st_ino ||
34515a55f79SPaul Richards 				    sb2.st_dev != file->st.st_dev ||
34615a55f79SPaul Richards 				    sb2.st_nlink == 0) {
34715a55f79SPaul Richards 					file->fp = freopen(file->file_name, "r", file->fp);
34815a55f79SPaul Richards 					if (file->fp == NULL) {
34915a55f79SPaul Richards 						ierr();
35015a55f79SPaul Richards 						continue;
35115a55f79SPaul Richards 					} else {
35215a55f79SPaul Richards 						memcpy(&file->st, &sb2, sizeof(struct stat));
35315a55f79SPaul Richards 						set_events(files);
35415a55f79SPaul Richards 					}
35515a55f79SPaul Richards 				}
35615a55f79SPaul Richards 			}
35715a55f79SPaul Richards 			show(file);
35815a55f79SPaul Richards 		}
35915a55f79SPaul Richards 
36015a55f79SPaul Richards 		switch (action) {
36115a55f79SPaul Richards 		case USE_KQUEUE:
36215a55f79SPaul Richards 			ts.tv_sec = 1;
36315a55f79SPaul Richards 			ts.tv_nsec = 0;
36415a55f79SPaul Richards 			/*
36515a55f79SPaul Richards 			 * In the -F case we set a timeout to ensure that
36615a55f79SPaul Richards 			 * we re-stat the file at least once every second.
36715a55f79SPaul Richards 			 */
36815a55f79SPaul Richards 			n = kevent(kq, NULL, 0, ev, 1, Fflag ? &ts : NULL);
36915a55f79SPaul Richards 			if (n < 0)
37015a55f79SPaul Richards 				err(1, "kevent");
37115a55f79SPaul Richards 			if (n == 0) {
37215a55f79SPaul Richards 				/* timeout */
37315a55f79SPaul Richards 				break;
37415a55f79SPaul Richards 			} else if (ev->filter == EVFILT_READ && ev->data < 0) {
37515a55f79SPaul Richards 				 /* file shrank, reposition to end */
37615a55f79SPaul Richards 				if (lseek(ev->ident, (off_t)0, SEEK_END) == -1) {
37715a55f79SPaul Richards 					ierr();
37815a55f79SPaul Richards 					continue;
37915a55f79SPaul Richards 				}
38015a55f79SPaul Richards 			}
38115a55f79SPaul Richards 			break;
38215a55f79SPaul Richards 
38315a55f79SPaul Richards 		case USE_SLEEP:
38415a55f79SPaul Richards 			(void) usleep(250000);
38515a55f79SPaul Richards 			break;
38615a55f79SPaul Richards 		}
38715a55f79SPaul Richards 	}
38815a55f79SPaul Richards }
389