tprof.c revision 1.1 
1/*	$NetBSD: tprof.c,v 1.1 2008/01/01 21:33:26 yamt Exp $	*/
2
3/*-
4 * Copyright (c)2008 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#ifndef lint
31__RCSID("$NetBSD: tprof.c,v 1.1 2008/01/01 21:33:26 yamt Exp $");
32#endif /* not lint */
33
34#include <sys/ioctl.h>
35#include <sys/wait.h>
36
37#include <dev/tprof/tprof_ioctl.h>
38
39#include <err.h>
40#include <errno.h>
41#include <fcntl.h>
42#include <inttypes.h>
43#include <pthread.h>
44#include <signal.h>
45#include <stdbool.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50
51#define	_PATH_TPROF	"/dev/tprof"
52
53int devfd;
54int outfd;
55
56static void
57usage(void)
58{
59
60	fprintf(stderr, "%s [-c] [-o outfile] command ...\n", getprogname());
61
62	exit(EXIT_FAILURE);
63}
64
65static void *
66process_samples(void *dummy)
67{
68
69	for (;;) {
70		char buf[4096];
71		const char *cp;
72		ssize_t ssz;
73
74		ssz = read(devfd, buf, sizeof(buf));
75		if (ssz == -1) {
76			err(EXIT_FAILURE, "read");
77		}
78		if (ssz == 0) {
79			break;
80		}
81		cp = buf;
82		while (ssz) {
83			ssize_t wsz;
84
85			wsz = write(outfd, cp, ssz);
86			if (wsz == -1) {
87				err(EXIT_FAILURE, "write");
88			}
89			ssz -= wsz;
90			cp += wsz;
91		}
92	}
93	return NULL;
94}
95
96int
97main(int argc, char *argv[])
98{
99	struct tprof_param param;
100	struct tprof_stat ts;
101	const char *outfile = "tprof.out";
102	bool cflag = false;
103	pid_t pid;
104	pthread_t pt;
105	int error;
106	int ret;
107	int ch;
108	int version;
109
110	while ((ch = getopt(argc, argv, "co:")) != -1) {
111		switch (ch) {
112		case 'c':
113			cflag = true;
114			break;
115		case 'o':
116			outfile = optarg;
117			break;
118		default:
119			usage();
120		}
121	}
122	argc -= optind;
123	argv += optind;
124	if (argc == 0) {
125		usage();
126	}
127
128	if (cflag) {
129		outfd = STDOUT_FILENO;
130	} else {
131		outfd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
132		if (outfd == -1) {
133			err(EXIT_FAILURE, "%s", optarg);
134		}
135	}
136
137	devfd = open(_PATH_TPROF, O_RDWR);
138	if (devfd == -1) {
139		err(EXIT_SUCCESS, "%s", _PATH_TPROF);
140	}
141
142	ret = ioctl(devfd, TPROF_IOC_GETVERSION, &version);
143	if (ret == -1) {
144		err(EXIT_SUCCESS, "TPROF_IOC_GETVERSION");
145	}
146	if (version != TPROF_VERSION) {
147		errx(EXIT_SUCCESS, "version mismatch: version=%d, expected=%d",
148		    version, TPROF_VERSION);
149	}
150
151	memset(&param, 0, sizeof(param));
152	ret = ioctl(devfd, TPROF_IOC_START, &param);
153	if (ret == -1) {
154		err(EXIT_SUCCESS, "TPROF_IOC_START");
155	}
156
157	pid = fork();
158	switch (pid) {
159	case -1:
160		err(EXIT_FAILURE, "fork");
161	case 0:
162		close(devfd);
163		execvp(argv[0], argv);
164		_Exit(EXIT_FAILURE);
165	}
166
167	signal(SIGINT, SIG_IGN);
168
169	error = pthread_create(&pt, NULL, process_samples, NULL);
170	if (error != 0) {
171		errx(1, "pthread_create: %s", strerror(error));
172	}
173
174	for (;;) {
175		int status;
176
177		pid = wait4(-1, &status, 0, NULL);
178		if (pid == -1) {
179			if (errno == ECHILD) {
180				break;
181			}
182			err(EXIT_FAILURE, "wait4");
183		}
184		if (pid != 0 && WIFEXITED(status)) {
185			break;
186		}
187	}
188
189	ret = ioctl(devfd, TPROF_IOC_STOP, NULL);
190	if (ret == -1) {
191		err(EXIT_FAILURE, "TPROF_IOC_STOP");
192	}
193
194	pthread_join(pt, NULL);
195
196	ret = ioctl(devfd, TPROF_IOC_GETSTAT, &ts);
197	if (ret == -1) {
198		err(EXIT_FAILURE, "TPROF_IOC_GETSTAT");
199	}
200
201	fprintf(stderr, "\n%s statistics:\n", getprogname());
202	fprintf(stderr, "\tsample %" PRIu64 "\n", ts.ts_sample);
203	fprintf(stderr, "\toverflow %" PRIu64 "\n", ts.ts_overflow);
204	fprintf(stderr, "\tbuf %" PRIu64 "\n", ts.ts_buf);
205	fprintf(stderr, "\temptybuf %" PRIu64 "\n", ts.ts_emptybuf);
206	fprintf(stderr, "\tdropbuf %" PRIu64 "\n", ts.ts_dropbuf);
207	fprintf(stderr, "\tdropbuf_sample %" PRIu64 "\n", ts.ts_dropbuf_sample);
208
209	exit(EXIT_SUCCESS);
210}
211