GCOV - Varnish Cache


/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006-2011 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
 *
 * Write data to fd
 * We try to use writev() if possible in order to minimize number of
 * syscalls made and packets sent.  It also just might allow the worker
 * thread to complete the request without holding stuff locked.
 *
 * XXX: chunked header (generated in Flush) and Tail (EndChunk)
 *      are not accounted by means of the size_t returned. Obvious ideas:
 *      - add size_t return value to Flush and EndChunk
 *      - base accounting on (struct v1l).cnt
 */

#include "config.h"

#include <sys/uio.h>
#include "cache/cache_varnishd.h"
#include "cache/cache_filter.h"

#include <stdio.h>

#include "cache_http1.h"
#include "vtim.h"

/*--------------------------------------------------------------------*/

struct v1l {
        unsigned                magic;
#define V1L_MAGIC               0x2f2142e5
        int                     *wfd;
        stream_close_t          werr;   /* valid after V1L_Flush() */
        struct iovec            *iov;
        int                     siov;
        int                     niov;
        size_t                  liov;
        size_t                  cliov;
        int                     ciov;   /* Chunked header marker */
        vtim_real               deadline;
        struct vsl_log          *vsl;
        uint64_t                cnt;    /* Flushed byte count */
        struct ws               *ws;
        uintptr_t               ws_snap;
        void                    **vdp_priv;
};

/*--------------------------------------------------------------------
 * for niov == 0, reserve the ws for max number of iovs
 * otherwise, up to niov
 */

struct v1l *
V1L_Open(struct ws *ws, int *fd, struct vsl_log *vsl,
    vtim_real deadline, unsigned niov)
{
        struct v1l *v1l;
        unsigned u;
        uintptr_t ws_snap;
        size_t sz;

        if (WS_Overflowed(ws))
                return (NULL);

        if (niov != 0)
                assert(niov >= 3);

        ws_snap = WS_Snapshot(ws);

        v1l = WS_Alloc(ws, sizeof *v1l);
        if (v1l == NULL)
                return (NULL);
        INIT_OBJ(v1l, V1L_MAGIC);

        v1l->ws = ws;
        v1l->ws_snap = ws_snap;

        u = WS_ReserveLumps(ws, sizeof(struct iovec));
        if (u < 3) {
                /* Must have at least 3 in case of chunked encoding */
                WS_Release(ws, 0);
                WS_MarkOverflow(ws);
                return (NULL);
        }
        if (u > IOV_MAX)
                u = IOV_MAX;
        if (niov != 0 && u > niov)
                u = niov;
        v1l->iov = WS_Reservation(ws);
        v1l->siov = (int)u;
        v1l->ciov = (int)u;
        v1l->wfd = fd;
        v1l->deadline = deadline;
        v1l->vsl = vsl;
        v1l->werr = SC_NULL;

        sz = u * sizeof(struct iovec);
        assert(sz < UINT_MAX);
        WS_Release(ws, (unsigned)sz);
        return (v1l);
}

void
V1L_NoRollback(struct v1l *v1l)
{

        CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
        v1l->ws_snap = 0;
}

stream_close_t
V1L_Close(struct v1l **v1lp, uint64_t *cnt)
{
        struct v1l *v1l;
        struct ws *ws;
        uintptr_t ws_snap;
        stream_close_t sc;

        AN(cnt);
        TAKE_OBJ_NOTNULL(v1l, v1lp, V1L_MAGIC);
        if (v1l->vdp_priv != NULL) {
                assert(*v1l->vdp_priv == v1l);
                *v1l->vdp_priv = NULL;
        }
        sc = V1L_Flush(v1l);
        *cnt = v1l->cnt;
        ws = v1l->ws;
        ws_snap = v1l->ws_snap;
        ZERO_OBJ(v1l, sizeof *v1l);
        if (ws_snap != 0)
                WS_Rollback(ws, ws_snap);
        return (sc);
}

static void
v1l_prune(struct v1l *v1l, ssize_t abytes)
{
        size_t used = 0;
        size_t sz, bytes, used_here;
        int j;

        assert(abytes > 0);
        bytes = (size_t)abytes;

        for (j = 0; j < v1l->niov; j++) {
                if (used + v1l->iov[j].iov_len > bytes) {
                        /* Cutoff is in this iov */
                        used_here = bytes - used;
                        v1l->iov[j].iov_len -= used_here;
                        v1l->iov[j].iov_base =
                            (char*)v1l->iov[j].iov_base + used_here;
                        sz = (unsigned)v1l->niov - (unsigned)j;
                        sz *= sizeof(struct iovec);
                        memmove(v1l->iov, &v1l->iov[j], sz);
                        v1l->niov -= j;
                        assert(v1l->liov >= bytes);
                        v1l->liov -= bytes;
                        return;
                }
                used += v1l->iov[j].iov_len;
        }
        AZ(v1l->liov);
}

stream_close_t
V1L_Flush(struct v1l *v1l)
{
        ssize_t i;
        size_t sz;
        int err;
        char cbuf[32];

        CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
        CHECK_OBJ_NOTNULL(v1l->werr, STREAM_CLOSE_MAGIC);
        AN(v1l->wfd);

        assert(v1l->niov <= v1l->siov);

        if (*v1l->wfd >= 0 && v1l->liov > 0 && v1l->werr == SC_NULL) {
                if (v1l->ciov < v1l->siov && v1l->cliov > 0) {
                        /* Add chunk head & tail */
                        bprintf(cbuf, "00%zx\r\n", v1l->cliov);
                        sz = strlen(cbuf);
                        v1l->iov[v1l->ciov].iov_base = cbuf;
                        v1l->iov[v1l->ciov].iov_len = sz;
                        v1l->liov += sz;

                        /* This is OK, because siov was --'ed */
                        v1l->iov[v1l->niov].iov_base = cbuf + sz - 2;
                        v1l->iov[v1l->niov++].iov_len = 2;
                        v1l->liov += 2;
                } else if (v1l->ciov < v1l->siov) {
                        v1l->iov[v1l->ciov].iov_base = cbuf;
                        v1l->iov[v1l->ciov].iov_len = 0;
                }

                i = 0;
                err = 0;
                do {
                        if (VTIM_real() > v1l->deadline) {
                                VSLb(v1l->vsl, SLT_Debug,
                                    "Hit total send timeout, "
                                    "wrote = %zd/%zd; not retrying",
                                    i, v1l->liov);
                                i = -1;
                                break;
                        }

                        i = writev(*v1l->wfd, v1l->iov, v1l->niov);
                        if (i > 0) {
                                v1l->cnt += (size_t)i;
                                if ((size_t)i == v1l->liov)
                                        break;
                        }

                        /* we hit a timeout, and some data may have been sent:
                         * Remove sent data from start of I/O vector, then retry
                         *
                         * XXX: Add a "minimum sent data per timeout counter to
                         * prevent slowloris attacks
                         */

                        err = errno;

                        if (err == EWOULDBLOCK) {
                                VSLb(v1l->vsl, SLT_Debug,
                                    "Hit idle send timeout, "
                                    "wrote = %zd/%zd; retrying",
                                    i, v1l->liov);
                        }

                        if (i > 0)
                                v1l_prune(v1l, i);
                } while (i > 0 || err == EWOULDBLOCK);

                if (i <= 0) {
                        VSLb(v1l->vsl, SLT_Debug,
                            "Write error, retval = %zd, len = %zd, errno = %s",
                            i, v1l->liov, VAS_errtxt(err));
                        assert(v1l->werr == SC_NULL);
                        if (err == EPIPE)
                                v1l->werr = SC_REM_CLOSE;
                        else
                                v1l->werr = SC_TX_ERROR;
                        errno = err;
                }
        }
        v1l->liov = 0;
        v1l->cliov = 0;
        v1l->niov = 0;
        if (v1l->ciov < v1l->siov)
                v1l->ciov = v1l->niov++;
        CHECK_OBJ_NOTNULL(v1l->werr, STREAM_CLOSE_MAGIC);
        return (v1l->werr);
}

size_t
V1L_Write(struct v1l *v1l, const void *ptr, ssize_t alen)
{
        size_t len = 0;

        CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
        AN(v1l->wfd);
        if (alen == 0 || *v1l->wfd < 0)
                return (0);
        if (alen > 0)
                len = (size_t)alen;
        else if (alen == -1)
                len = strlen(ptr);
        else
                WRONG("alen");

        assert(v1l->niov < v1l->siov);
        v1l->iov[v1l->niov].iov_base = TRUST_ME(ptr);
        v1l->iov[v1l->niov].iov_len = len;
        v1l->liov += len;
        v1l->niov++;
        v1l->cliov += len;
        if (v1l->niov >= v1l->siov) {
                (void)V1L_Flush(v1l);
                VSC_C_main->http1_iovs_flush++;
        }
        return (len);
}

void
V1L_Chunked(struct v1l *v1l)
{

        CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);

        assert(v1l->ciov == v1l->siov);
        assert(v1l->siov >= 3);
        /*
         * If there is no space for chunked header, a chunk of data and
         * a chunk tail, we might as well flush right away.
         */
        if (v1l->niov + 3 >= v1l->siov) {
                (void)V1L_Flush(v1l);
                VSC_C_main->http1_iovs_flush++;
        }
        v1l->siov--;
        v1l->ciov = v1l->niov++;
        v1l->cliov = 0;
        assert(v1l->ciov < v1l->siov);
        assert(v1l->niov < v1l->siov);
}

/*
 * XXX: It is not worth the complexity to attempt to get the
 * XXX: end of chunk into the V1L_Flush(), because most of the time
 * XXX: if not always, that is a no-op anyway, because the calling
 * XXX: code already called V1L_Flush() to release local storage.
 */

void
V1L_EndChunk(struct v1l *v1l)
{

        CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);

        assert(v1l->ciov < v1l->siov);
        (void)V1L_Flush(v1l);
        v1l->siov++;
        v1l->ciov = v1l->siov;
        v1l->niov = 0;
        v1l->cliov = 0;
        (void)V1L_Write(v1l, "0\r\n\r\n", -1);
}

/*--------------------------------------------------------------------
 * VDP using V1L
 */

/* remember priv pointer for V1L_Close() to clear */
static int v_matchproto_(vdp_init_f)
v1l_init(VRT_CTX, struct vdp_ctx *vdc, void **priv)
{
        struct v1l *v1l;

        (void) ctx;
        (void) vdc;
        AN(priv);
        CAST_OBJ_NOTNULL(v1l, *priv, V1L_MAGIC);

        v1l->vdp_priv = priv;
        return (0);
}

static int v_matchproto_(vdp_bytes_f)
v1l_bytes(struct vdp_ctx *vdc, enum vdp_action act, void **priv,
    const void *ptr, ssize_t len)
{
        size_t wl = 0;

        CHECK_OBJ_NOTNULL(vdc, VDP_CTX_MAGIC);
        AN(priv);

        AZ(vdc->nxt);           /* always at the bottom of the pile */

        if (len > 0)
                wl = V1L_Write(*priv, ptr, len);
        if (act > VDP_NULL && V1L_Flush(*priv) != SC_NULL)
                return (-1);
        if ((size_t)len != wl)
                return (-1);
        return (0);
}

const struct vdp * const VDP_v1l = &(struct vdp){
        .name =         "V1B",
        .init =         v1l_init,
        .bytes =        v1l_bytes,
};

		varnish-cache/bin/varnishd/http1/cache_http1_line.c
0		/*-
1		* Copyright (c) 2006 Verdens Gang AS
2		* Copyright (c) 2006-2011 Varnish Software AS
3		* All rights reserved.
4		*
5		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
6		*
7		* SPDX-License-Identifier: BSD-2-Clause
8		*
9		* Redistribution and use in source and binary forms, with or without
10		* modification, are permitted provided that the following conditions
11		* are met:
12		* 1. Redistributions of source code must retain the above copyright
13		* notice, this list of conditions and the following disclaimer.
14		* 2. Redistributions in binary form must reproduce the above copyright
15		* notice, this list of conditions and the following disclaimer in the
16		* documentation and/or other materials provided with the distribution.
17		*
18		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
22		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28		* SUCH DAMAGE.
29		*
30		* Write data to fd
31		* We try to use writev() if possible in order to minimize number of
32		* syscalls made and packets sent. It also just might allow the worker
33		* thread to complete the request without holding stuff locked.
34		*
35		* XXX: chunked header (generated in Flush) and Tail (EndChunk)
36		* are not accounted by means of the size_t returned. Obvious ideas:
37		* - add size_t return value to Flush and EndChunk
38		* - base accounting on (struct v1l).cnt
39		*/
40
41		#include "config.h"
42
43		#include <sys/uio.h>
44		#include "cache/cache_varnishd.h"
45		#include "cache/cache_filter.h"
46
47		#include <stdio.h>
48
49		#include "cache_http1.h"
50		#include "vtim.h"
51
52		/--------------------------------------------------------------------/
53
54		struct v1l {
55		unsigned magic;
56		#define V1L_MAGIC 0x2f2142e5
57		int *wfd;
58		stream_close_t werr; /* valid after V1L_Flush() */
59		struct iovec *iov;
60		int siov;
61		int niov;
62		size_t liov;
63		size_t cliov;
64		int ciov; /* Chunked header marker */
65		vtim_real deadline;
66		struct vsl_log *vsl;
67		uint64_t cnt; /* Flushed byte count */
68		struct ws *ws;
69		uintptr_t ws_snap;
70		void **vdp_priv;
71		};
72
73		/*--------------------------------------------------------------------
74		* for niov == 0, reserve the ws for max number of iovs
75		* otherwise, up to niov
76		*/
77
78		struct v1l *
79	20664	V1L_Open(struct ws ws, int fd, struct vsl_log *vsl,
80		vtim_real deadline, unsigned niov)
81		{
82		struct v1l *v1l;
83		unsigned u;
84		uintptr_t ws_snap;
85		size_t sz;
86
87	20664	if (WS_Overflowed(ws))
88	0	return (NULL);
89
90	20664	if (niov != 0)
91	12188	assert(niov >= 3);
92
93	20664	ws_snap = WS_Snapshot(ws);
94
95	20664	v1l = WS_Alloc(ws, sizeof *v1l);
96	20664	if (v1l == NULL)
97	4	return (NULL);
98	20660	INIT_OBJ(v1l, V1L_MAGIC);
99
100	20660	v1l->ws = ws;
101	20660	v1l->ws_snap = ws_snap;
102
103	20660	u = WS_ReserveLumps(ws, sizeof(struct iovec));
104	20660	if (u < 3) {
105		/* Must have at least 3 in case of chunked encoding */
106	0	WS_Release(ws, 0);
107	0	WS_MarkOverflow(ws);
108	0	return (NULL);
109		}
110	20660	if (u > IOV_MAX)
111	128	u = IOV_MAX;
112	20660	if (niov != 0 && u > niov)
113	11884	u = niov;
114	20660	v1l->iov = WS_Reservation(ws);
115	20660	v1l->siov = (int)u;
116	20660	v1l->ciov = (int)u;
117	20660	v1l->wfd = fd;
118	20660	v1l->deadline = deadline;
119	20660	v1l->vsl = vsl;
120	20660	v1l->werr = SC_NULL;
121
122	20660	sz = u * sizeof(struct iovec);
123	20660	assert(sz < UINT_MAX);
124	20660	WS_Release(ws, (unsigned)sz);
125	20660	return (v1l);
126	20664	}
127
128		void
129	128	V1L_NoRollback(struct v1l *v1l)
130		{
131
132	128	CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
133	128	v1l->ws_snap = 0;
134	128	}
135
136		stream_close_t
137	20661	V1L_Close(struct v1l *v1lp, uint64_t cnt)
138		{
139		struct v1l *v1l;
140		struct ws *ws;
141		uintptr_t ws_snap;
142		stream_close_t sc;
143
144	20661	AN(cnt);
145	20661	TAKE_OBJ_NOTNULL(v1l, v1lp, V1L_MAGIC);
146	20661	if (v1l->vdp_priv != NULL) {
147	16192	assert(*v1l->vdp_priv == v1l);
148	16192	*v1l->vdp_priv = NULL;
149	16192	}
150	20661	sc = V1L_Flush(v1l);
151	20661	*cnt = v1l->cnt;
152	20661	ws = v1l->ws;
153	20661	ws_snap = v1l->ws_snap;
154	20661	ZERO_OBJ(v1l, sizeof *v1l);
155	20661	if (ws_snap != 0)
156	20533	WS_Rollback(ws, ws_snap);
157	20661	return (sc);
158		}
159
160		static void
161	74	v1l_prune(struct v1l *v1l, ssize_t abytes)
162		{
163	74	size_t used = 0;
164		size_t sz, bytes, used_here;
165		int j;
166
167	74	assert(abytes > 0);
168	74	bytes = (size_t)abytes;
169
170	318	for (j = 0; j < v1l->niov; j++) {
171	318	if (used + v1l->iov[j].iov_len > bytes) {
172		/* Cutoff is in this iov */
173	74	used_here = bytes - used;
174	74	v1l->iov[j].iov_len -= used_here;
175	74	v1l->iov[j].iov_base =
176	74	(char*)v1l->iov[j].iov_base + used_here;
177	74	sz = (unsigned)v1l->niov - (unsigned)j;
178	74	sz *= sizeof(struct iovec);
179	74	memmove(v1l->iov, &v1l->iov[j], sz);
180	74	v1l->niov -= j;
181	74	assert(v1l->liov >= bytes);
182	74	v1l->liov -= bytes;
183	74	return;
184		}
185	244	used += v1l->iov[j].iov_len;
186	244	}
187	0	AZ(v1l->liov);
188	74	}
189
190		stream_close_t
191	41304	V1L_Flush(struct v1l *v1l)
192		{
193		ssize_t i;
194		size_t sz;
195		int err;
196		char cbuf[32];
197
198	41304	CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
199	41304	CHECK_OBJ_NOTNULL(v1l->werr, STREAM_CLOSE_MAGIC);
200	41304	AN(v1l->wfd);
201
202	41304	assert(v1l->niov <= v1l->siov);
203
204	41304	if (*v1l->wfd >= 0 && v1l->liov > 0 && v1l->werr == SC_NULL) {
205	27863	if (v1l->ciov < v1l->siov && v1l->cliov > 0) {
206		/* Add chunk head & tail */
207	4272	bprintf(cbuf, "00%zx\r\n", v1l->cliov);
208	4272	sz = strlen(cbuf);
209	4272	v1l->iov[v1l->ciov].iov_base = cbuf;
210	4272	v1l->iov[v1l->ciov].iov_len = sz;
211	4272	v1l->liov += sz;
212
213		/* This is OK, because siov was --'ed */
214	4272	v1l->iov[v1l->niov].iov_base = cbuf + sz - 2;
215	4272	v1l->iov[v1l->niov++].iov_len = 2;
216	4272	v1l->liov += 2;
217	27863	} else if (v1l->ciov < v1l->siov) {
218	251	v1l->iov[v1l->ciov].iov_base = cbuf;
219	251	v1l->iov[v1l->ciov].iov_len = 0;
220	251	}
221
222	27863	i = 0;
223	27863	err = 0;
224	27863	do {
225	28046	if (VTIM_real() > v1l->deadline) {
226	32	VSLb(v1l->vsl, SLT_Debug,
227		"Hit total send timeout, "
228		"wrote = %zd/%zd; not retrying",
229	16	i, v1l->liov);
230	16	i = -1;
231	16	break;
232		}
233
234	28030	i = writev(*v1l->wfd, v1l->iov, v1l->niov);
235	28030	if (i > 0) {
236	27890	v1l->cnt += (size_t)i;
237	27890	if ((size_t)i == v1l->liov)
238	27816	break;
239	74	}
240
241		/* we hit a timeout, and some data may have been sent:
242		* Remove sent data from start of I/O vector, then retry
243		*
244		* XXX: Add a "minimum sent data per timeout counter to
245		* prevent slowloris attacks
246		*/
247
248	214	err = errno;
249
250	214	if (err == EWOULDBLOCK) {
251	216	VSLb(v1l->vsl, SLT_Debug,
252		"Hit idle send timeout, "
253		"wrote = %zd/%zd; retrying",
254	108	i, v1l->liov);
255	108	}
256
257	214	if (i > 0)
258	74	v1l_prune(v1l, i);
259	214	} while (i > 0 \|\| err == EWOULDBLOCK);
260
261	27863	if (i <= 0) {
262	96	VSLb(v1l->vsl, SLT_Debug,
263		"Write error, retval = %zd, len = %zd, errno = %s",
264	48	i, v1l->liov, VAS_errtxt(err));
265	48	assert(v1l->werr == SC_NULL);
266	48	if (err == EPIPE)
267	32	v1l->werr = SC_REM_CLOSE;
268		else
269	16	v1l->werr = SC_TX_ERROR;
270	48	errno = err;
271	48	}
272	27863	}
273	41304	v1l->liov = 0;
274	41304	v1l->cliov = 0;
275	41304	v1l->niov = 0;
276	41304	if (v1l->ciov < v1l->siov)
277	8300	v1l->ciov = v1l->niov++;
278	41298	CHECK_OBJ_NOTNULL(v1l->werr, STREAM_CLOSE_MAGIC);
279	41298	return (v1l->werr);
280		}
281
282		size_t
283	462026	V1L_Write(struct v1l v1l, const void ptr, ssize_t alen)
284		{
285	462026	size_t len = 0;
286
287	462026	CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
288	462026	AN(v1l->wfd);
289	462026	if (alen == 0 \|\| *v1l->wfd < 0)
290	200	return (0);
291	462026	if (alen > 0)
292	227533	len = (size_t)alen;
293	234493	else if (alen == -1)
294	234493	len = strlen(ptr);
295		else
296	0	WRONG("alen");
297
298	462026	assert(v1l->niov < v1l->siov);
299	462026	v1l->iov[v1l->niov].iov_base = TRUST_ME(ptr);
300	462026	v1l->iov[v1l->niov].iov_len = len;
301	462026	v1l->liov += len;
302	462026	v1l->niov++;
303	462026	v1l->cliov += len;
304	462026	if (v1l->niov >= v1l->siov) {
305	440	(void)V1L_Flush(v1l);
306	440	VSC_C_main->http1_iovs_flush++;
307	440	}
308	462026	return (len);
309	462026	}
310
311		void
312	1109	V1L_Chunked(struct v1l *v1l)
313		{
314
315	1109	CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
316
317	1109	assert(v1l->ciov == v1l->siov);
318	1109	assert(v1l->siov >= 3);
319		/*
320		* If there is no space for chunked header, a chunk of data and
321		* a chunk tail, we might as well flush right away.
322		*/
323	1109	if (v1l->niov + 3 >= v1l->siov) {
324	0	(void)V1L_Flush(v1l);
325	0	VSC_C_main->http1_iovs_flush++;
326	0	}
327	1109	v1l->siov--;
328	1109	v1l->ciov = v1l->niov++;
329	1109	v1l->cliov = 0;
330	1109	assert(v1l->ciov < v1l->siov);
331	1109	assert(v1l->niov < v1l->siov);
332	1109	}
333
334		/*
335		* XXX: It is not worth the complexity to attempt to get the
336		* XXX: end of chunk into the V1L_Flush(), because most of the time
337		* XXX: if not always, that is a no-op anyway, because the calling
338		* XXX: code already called V1L_Flush() to release local storage.
339		*/
340
341		void
342	1025	V1L_EndChunk(struct v1l *v1l)
343		{
344
345	1025	CHECK_OBJ_NOTNULL(v1l, V1L_MAGIC);
346
347	1025	assert(v1l->ciov < v1l->siov);
348	1025	(void)V1L_Flush(v1l);
349	1025	v1l->siov++;
350	1025	v1l->ciov = v1l->siov;
351	1025	v1l->niov = 0;
352	1025	v1l->cliov = 0;
353	1025	(void)V1L_Write(v1l, "0\r\n\r\n", -1);
354	1025	}
355
356		/*--------------------------------------------------------------------
357		* VDP using V1L
358		*/
359
360		/* remember priv pointer for V1L_Close() to clear */
361		static int v_matchproto_(vdp_init_f)
362	16192	v1l_init(VRT_CTX, struct vdp_ctx vdc, void *priv)
363		{
364		struct v1l *v1l;
365
366	16192	(void) ctx;
367	16192	(void) vdc;
368	16192	AN(priv);
369	16192	CAST_OBJ_NOTNULL(v1l, *priv, V1L_MAGIC);
370
371	16192	v1l->vdp_priv = priv;
372	16192	return (0);
373		}
374
375		static int v_matchproto_(vdp_bytes_f)
376	19634	v1l_bytes(struct vdp_ctx vdc, enum vdp_action act, void *priv,
377		const void *ptr, ssize_t len)
378		{
379	19634	size_t wl = 0;
380
381	19634	CHECK_OBJ_NOTNULL(vdc, VDP_CTX_MAGIC);
382	19634	AN(priv);
383
384	19634	AZ(vdc->nxt); /* always at the bottom of the pile */
385
386	19634	if (len > 0)
387	14229	wl = V1L_Write(*priv, ptr, len);
388	19634	if (act > VDP_NULL && V1L_Flush(*priv) != SC_NULL)
389	48	return (-1);
390	19586	if ((size_t)len != wl)
391	0	return (-1);
392	19586	return (0);
393	19634	}
394
395		const struct vdp * const VDP_v1l = &(struct vdp){
396		.name = "V1B",
397		.init = v1l_init,
398		.bytes = v1l_bytes,
399		};