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 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/statvfs.h> 31 #include <sys/param.h> 32 #include <sys/stat.h> 33 34 #include <unistd.h> 35 #include <string.h> 36 #include <stdio.h> 37 #include <fcntl.h> 38 39 #include "utils.h" 40 41 static FILE * 42 minfree_open(const char *dir, int oflags, const char *fmode) 43 { 44 char path[MAXPATHLEN]; 45 int fd; 46 47 (void) snprintf(path, sizeof (path), "%s/minfree", dir); 48 49 if ((fd = open(path, oflags, S_IRUSR | S_IWUSR)) >= 0) 50 return (fdopen(fd, fmode)); 51 52 return (NULL); 53 } 54 55 int 56 minfree_read(const char *dir, unsigned long long *ullp) 57 { 58 FILE *fp = minfree_open(dir, O_RDONLY, "r"); 59 60 if (fp != NULL) { 61 char buf[BUFSIZ]; 62 int status = -1; 63 64 if (fgets(buf, BUFSIZ, fp) != NULL) { 65 if (valid_str2ull(buf, ullp)) 66 status = 0; 67 else 68 warn(gettext("\"%s/minfree\": invalid minfree " 69 "value -- %s\n"), dir, buf); 70 } 71 72 (void) fclose(fp); 73 return (status); 74 } 75 76 return (-1); 77 } 78 79 int 80 minfree_write(const char *dir, unsigned long long ull) 81 { 82 FILE *fp = minfree_open(dir, O_WRONLY | O_CREAT | O_TRUNC, "w"); 83 84 if (fp != NULL) { 85 int status = fprintf(fp, "%llu\n", ull); 86 (void) fclose(fp); 87 return (status); 88 } 89 90 return (-1); 91 } 92 93 int 94 minfree_compute(const char *dir, char *s, unsigned long long *ullp) 95 { 96 size_t len = strlen(s); 97 unsigned long long m = 1; 98 99 struct statvfs64 fsb; 100 int pct; 101 102 switch (s[len - 1]) { 103 case '%': 104 s[len - 1] = '\0'; 105 106 if (!valid_str2int(s, &pct) || pct > 100) { 107 warn(gettext("invalid minfree %% -- %s\n"), s); 108 return (-1); 109 } 110 111 if (statvfs64(dir, &fsb) == -1) { 112 warn(gettext("failed to statvfs %s"), dir); 113 return (-1); 114 } 115 116 *ullp = fsb.f_blocks * fsb.f_frsize * 117 (u_longlong_t)pct / 100ULL / 1024ULL; 118 119 return (0); 120 121 case 'm': 122 case 'M': 123 m = 1024ULL; 124 /*FALLTHRU*/ 125 126 case 'k': 127 case 'K': 128 s[len - 1] = '\0'; 129 130 if (valid_str2ull(s, ullp)) { 131 *ullp *= m; 132 return (0); 133 } 134 135 warn(gettext("invalid minfree value -- %s\n"), s); 136 return (-1); 137 138 default: 139 warn(gettext("expected m, k, or %% unit after " 140 "minfree -- %s\n"), s); 141 return (-1); 142 } 143 } 144