whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 3 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of version 2 of the GNU General Public License as |
| 6 | * published by the Free Software Foundation. |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 7 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 8 | * This program is distributed in the hope that it would be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 11 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 12 | * Further, this software is distributed without any warranty that it is |
| 13 | * free of the rightful claim of any third person regarding infringement |
| 14 | * or the like. Any license provided herein, whether implied or |
| 15 | * otherwise, applies only to this software file. Patent licenses, if |
| 16 | * any, provided herein do not apply to combinations of this program with |
| 17 | * other software, or any other product whatsoever. |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 18 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write the Free Software Foundation, Inc., 59 |
| 21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 22 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, |
| 24 | * Mountain View, CA 94043, or: |
vapier | 45a8ba0 | 2009-07-20 10:59:32 +0000 | [diff] [blame] | 25 | * |
| 26 | * http://www.sgi.com |
| 27 | * |
| 28 | * For further information regarding this notice, see: |
| 29 | * |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 30 | * http://oss.sgi.com/projects/GenInfo/NoticeExplan/ |
| 31 | */ |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <sys/file.h> |
| 35 | #include <sys/param.h> |
| 36 | #include <fcntl.h> |
| 37 | #include <unistd.h> |
| 38 | #include <stdio.h> |
| 39 | #include <errno.h> |
| 40 | #include <sys/sysmacros.h> |
| 41 | #include <string.h> /* memset, strerror */ |
alaffin | cc2e555 | 2000-07-27 17:13:18 +0000 | [diff] [blame] | 42 | #include "file_lock.h" |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 43 | |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 44 | |
| 45 | #ifndef EFSEXCLWR |
| 46 | #define EFSEXCLWR 503 |
| 47 | #endif |
| 48 | |
| 49 | /* |
| 50 | * String containing the last system call. |
| 51 | * |
| 52 | */ |
| 53 | char Fl_syscall_str[128]; |
| 54 | |
| 55 | static char errmsg[256]; |
| 56 | |
| 57 | /*********************************************************************** |
| 58 | * |
| 59 | * Test interface to the fcntl system call. |
| 60 | * It will loop if the LOCK_NB flags is NOT set. |
| 61 | ***********************************************************************/ |
| 62 | int |
| 63 | file_lock(fd, flags, errormsg) |
| 64 | int fd; |
| 65 | int flags; |
| 66 | char **errormsg; |
| 67 | { |
| 68 | register int cmd, ret; |
| 69 | struct flock flocks; |
| 70 | |
| 71 | memset(&flocks, 0, sizeof(struct flock)); |
| 72 | |
| 73 | if (flags&LOCK_NB) |
| 74 | cmd = F_SETLK; |
| 75 | else |
| 76 | cmd = F_SETLKW; |
| 77 | |
| 78 | flocks.l_whence = 0; |
| 79 | flocks.l_start = 0; |
| 80 | flocks.l_len = 0; |
| 81 | |
| 82 | if (flags&LOCK_UN) |
| 83 | flocks.l_type = F_UNLCK; |
| 84 | else if (flags&LOCK_EX) |
| 85 | flocks.l_type = F_WRLCK; |
| 86 | else if (flags&LOCK_SH) |
| 87 | flocks.l_type = F_RDLCK; |
| 88 | else { |
| 89 | errno = EINVAL; |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 90 | if (errormsg != NULL) { |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 91 | sprintf(errmsg, |
| 92 | "Programmer error, called file_lock with in valid flags\n"); |
| 93 | *errormsg = errmsg; |
| 94 | } |
| 95 | return -1; |
| 96 | } |
| 97 | |
| 98 | sprintf(Fl_syscall_str, |
| 99 | "fcntl(%d, %d, &flocks): type:%d whence:%d, start:%lld len:%lld\n", |
| 100 | fd, cmd, flocks.l_type, flocks.l_whence, |
| 101 | (long long)flocks.l_start, (long long)flocks.l_len); |
| 102 | |
| 103 | while (1) { |
| 104 | ret = fcntl(fd, cmd, &flocks); |
| 105 | |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 106 | if (ret < 0) { |
| 107 | if (cmd == F_SETLK) |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 108 | switch (errno) { |
| 109 | /* these errors are okay */ |
| 110 | case EACCES: /* Permission denied */ |
| 111 | case EINTR: /* interrupted system call */ |
| 112 | #ifdef EFILESH |
| 113 | case EFILESH: /* file shared */ |
| 114 | #endif |
| 115 | case EFSEXCLWR: /* File is write protected */ |
| 116 | continue; /* retry getting lock */ |
| 117 | } |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 118 | if (errormsg != NULL) { |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 119 | sprintf(errmsg, "fcntl(%d, %d, &flocks): errno:%d %s\n", |
| 120 | fd, cmd, errno, strerror(errno)); |
| 121 | *errormsg = errmsg; |
| 122 | } |
| 123 | return -1; |
| 124 | } |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | |
| 130 | } /* end of file_lock */ |
| 131 | |
| 132 | /*********************************************************************** |
| 133 | * |
| 134 | * Test interface to the fcntl system call. |
| 135 | * It will loop if the LOCK_NB flags is NOT set. |
| 136 | ***********************************************************************/ |
| 137 | int |
| 138 | record_lock(fd, flags, start, len, errormsg) |
| 139 | int fd; |
| 140 | int flags; |
| 141 | int start; |
| 142 | int len; |
| 143 | char **errormsg; |
| 144 | { |
| 145 | register int cmd, ret; |
| 146 | struct flock flocks; |
| 147 | |
| 148 | memset(&flocks, 0, sizeof(struct flock)); |
| 149 | |
| 150 | if (flags&LOCK_NB) |
| 151 | cmd = F_SETLK; |
| 152 | else |
| 153 | cmd = F_SETLKW; |
| 154 | |
| 155 | flocks.l_whence = 0; |
| 156 | flocks.l_start = start; |
| 157 | flocks.l_len = len; |
| 158 | |
| 159 | if (flags&LOCK_UN) |
| 160 | flocks.l_type = F_UNLCK; |
| 161 | else if (flags&LOCK_EX) |
| 162 | flocks.l_type = F_WRLCK; |
| 163 | else if (flags&LOCK_SH) |
| 164 | flocks.l_type = F_RDLCK; |
| 165 | else { |
| 166 | errno = EINVAL; |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 167 | if (errormsg != NULL) { |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 168 | sprintf(errmsg, |
| 169 | "Programmer error, called record_lock with in valid flags\n"); |
| 170 | *errormsg = errmsg; |
| 171 | } |
| 172 | return -1; |
| 173 | } |
| 174 | |
| 175 | sprintf(Fl_syscall_str, |
| 176 | "fcntl(%d, %d, &flocks): type:%d whence:%d, start:%lld len:%lld\n", |
| 177 | fd, cmd, flocks.l_type, flocks.l_whence, |
| 178 | (long long)flocks.l_start, (long long)flocks.l_len); |
| 179 | |
| 180 | while (1) { |
| 181 | ret = fcntl(fd, cmd, &flocks); |
| 182 | |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 183 | if (ret < 0) { |
| 184 | if (cmd == F_SETLK) |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 185 | switch (errno) { |
| 186 | /* these errors are okay */ |
| 187 | case EACCES: /* Permission denied */ |
| 188 | case EINTR: /* interrupted system call */ |
| 189 | #ifdef EFILESH |
| 190 | case EFILESH: /* file shared */ |
| 191 | #endif |
| 192 | case EFSEXCLWR: /* File is write protected */ |
| 193 | continue; /* retry getting lock */ |
| 194 | } |
Garrett Cooper | 903910d | 2010-11-23 09:27:44 -0800 | [diff] [blame] | 195 | if (errormsg != NULL) { |
whr | b973f2b | 2000-05-05 19:34:50 +0000 | [diff] [blame] | 196 | sprintf(errmsg, "fcntl(%d, %d, &flocks): errno:%d %s\n", |
| 197 | fd, cmd, errno, strerror(errno)); |
| 198 | *errormsg = errmsg; |
| 199 | } |
| 200 | return -1; |
| 201 | } |
| 202 | break; |
| 203 | } |
| 204 | |
| 205 | return ret; |
| 206 | |
| 207 | } /* end of record_lock */ |
| 208 | |
| 209 | |