1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 2000-2001 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <stdlib.h>
33 #include <errno.h>
34 #include <string.h>
35 #include <strings.h>
36
37 #include "rdimpl.h"
38 #include "rdtable.h"
39 #include "rdutil.h"
40 #include "rdfile.h"
41
42 #define FDS_TABLE_SIZE 1024
43
44 static fd_t *fd_tbl = NULL;
45 static int fd_max;
46 static int fd_cnt;
47 static int fd_cnt_cur;
48 static int fd_cnt_old;
49 static fds_t *fds_tbl[FDS_TABLE_SIZE];
50
51 void
fd_init(int n)52 fd_init(int n)
53 {
54 fd_max = n;
55 fd_cnt = fd_cnt_cur = fd_cnt_old = 0;
56 fd_tbl = Zalloc(sizeof (fd_t) * n);
57 (void) memset(fds_tbl, 0, sizeof (fds_t *) * FDS_TABLE_SIZE);
58 }
59
60 void
fd_exit()61 fd_exit()
62 {
63 if (fd_tbl)
64 free(fd_tbl);
65 }
66
67 void
fd_close(fd_t * fdp)68 fd_close(fd_t *fdp)
69 {
70 if (fdp) {
71 if (fdp->fd_fd >= 0 && fdp->fd_name[0] != '\0') {
72 (void) close(fdp->fd_fd);
73 fd_cnt--;
74 }
75
76 (void) memset(fdp, 0, sizeof (fd_t));
77 fdp->fd_fd = -1;
78 }
79 }
80
81 void
fd_closeall()82 fd_closeall()
83 {
84 fd_t *fdp = fd_tbl;
85 int i;
86
87 for (i = 0; i < fd_max; i++) {
88 fd_close(fdp);
89 fdp++;
90 }
91 }
92
93
94 int
fd_count()95 fd_count()
96 {
97 fd_t *fdp = fd_tbl;
98 int count = 0;
99 int i;
100
101 for (i = 0; i < fd_max; i++, fdp++) {
102 if (fdp->fd_name[0] != '\0') {
103 ++count;
104 }
105 }
106 return (count);
107 }
108
109
110 static void
fd_recycle()111 fd_recycle()
112 {
113 fd_t *fdp = fd_tbl;
114 int counter;
115 int i;
116
117 counter = abs(fd_cnt_old - fd_cnt) + NUM_RESERVED_FD;
118
119 for (i = 0; i < fd_max; i++, fdp++) {
120
121 if (fdp->fd_fd == -1)
122 continue; /* skip recycled ones */
123
124 if (fdp->fd_name[0] != '\0') { /* file has name */
125 (void) close(fdp->fd_fd);
126 fd_cnt--;
127 counter--;
128 fdp->fd_fd = -1;
129 }
130
131 if (counter == 0)
132 break;
133 }
134 }
135
136 fd_t *
fd_open(char * name,int flags,fd_t * fdp)137 fd_open(char *name, int flags, fd_t *fdp)
138 {
139 fd_t *fdp_new;
140 int fd;
141
142 if (fd_cnt > fd_max - NUM_RESERVED_FD)
143 fd_recycle();
144
145 if (fdp != NULL) {
146 if ((strcmp(fdp->fd_name, name) == 0) && (fdp->fd_fd >= 0)) {
147 fd_cnt_cur++;
148 return (fdp);
149 }
150 }
151
152 again: fd = open(name, flags);
153
154 if (fd == -1) {
155 if ((errno == EMFILE) || (errno == ENFILE)) {
156 fd_recycle();
157 goto again;
158 }
159 fdp_new = NULL;
160 } else {
161 fdp_new = &fd_tbl[fd];
162 fdp_new->fd_fd = fd;
163 fdp_new->fd_flags = flags;
164 (void) strcpy(fdp_new->fd_name, name);
165 fd_cnt++;
166 fd_cnt_cur++;
167 }
168 return (fdp_new);
169 }
170
171 int
fd_getfd(fd_t * fdp)172 fd_getfd(fd_t *fdp)
173 {
174 return (fdp->fd_fd);
175 }
176
177 void
fd_update()178 fd_update()
179 {
180 fd_cnt_old = fd_cnt_cur;
181 fd_cnt_cur = 0;
182 }
183
184 fds_t *
fds_get(pid_t pid)185 fds_get(pid_t pid)
186 {
187 fds_t *fdsp;
188 int hash = pid % FDS_TABLE_SIZE;
189
190 for (fdsp = fds_tbl[hash]; fdsp; fdsp = fdsp->fds_next)
191 if (fdsp->fds_pid == pid) /* searching for pid */
192 return (fdsp);
193
194 fdsp = Zalloc(sizeof (fds_t)); /* adding new if pid was not found */
195 fdsp->fds_pid = pid;
196 fdsp->fds_next = fds_tbl[hash];
197 fds_tbl[hash] = fdsp;
198 return (fdsp);
199 }
200
201 void
fds_rm(pid_t pid)202 fds_rm(pid_t pid)
203 {
204 fds_t *fds;
205 fds_t *fds_prev = NULL;
206 int hash = pid % FDS_TABLE_SIZE;
207
208 for (fds = fds_tbl[hash]; fds && fds->fds_pid != pid;
209 fds = fds->fds_next) /* finding pid */
210 fds_prev = fds;
211
212 if (fds) { /* if pid was found */
213
214 fd_close(fds->fds_psinfo);
215 fd_close(fds->fds_usage);
216 fd_close(fds->fds_lpsinfo);
217 fd_close(fds->fds_lusage);
218
219 if (fds_prev)
220 fds_prev->fds_next = fds->fds_next;
221 else
222 fds_tbl[hash] = fds->fds_next;
223
224 free(fds);
225 }
226 }
227