[b06e68ef] | 1 | /* |
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[07a3253d] | 2 | * This file contains the support infrastructure used to manage the |
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| 3 | * table of integer style file descriptors used by the low level |
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| 4 | * POSIX system calls like open(), read, fstat(), etc. |
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| 5 | * |
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[08311cc3] | 6 | * COPYRIGHT (c) 1989-1999. |
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[07a3253d] | 7 | * On-Line Applications Research Corporation (OAR). |
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| 8 | * |
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| 9 | * The license and distribution terms for this file may be |
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| 10 | * found in the file LICENSE in this distribution or at |
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| 11 | * http://www.OARcorp.com/rtems/license.html. |
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[b06e68ef] | 12 | * |
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| 13 | * $Id$ |
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| 14 | */ |
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| 15 | |
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[07a3253d] | 16 | #include "libio_.h" /* libio_.h pulls in rtems */ |
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[cca4400] | 17 | #include <rtems.h> |
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| 18 | #include <rtems/assoc.h> /* assoc.h not included by rtems.h */ |
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| 19 | |
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| 20 | #include <stdio.h> /* O_RDONLY, et.al. */ |
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| 21 | #include <fcntl.h> /* O_RDONLY, et.al. */ |
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| 22 | #include <assert.h> |
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| 23 | #include <errno.h> |
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| 24 | |
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| 25 | #if ! defined(O_NDELAY) |
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| 26 | # if defined(solaris2) |
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| 27 | # define O_NDELAY O_NONBLOCK |
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| 28 | # elif defined(RTEMS_NEWLIB) |
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| 29 | # define O_NDELAY _FNBIO |
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| 30 | # endif |
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| 31 | #endif |
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| 32 | |
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| 33 | |
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| 34 | #include <errno.h> |
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| 35 | #include <string.h> /* strcmp */ |
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| 36 | #include <unistd.h> |
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| 37 | #include <stdlib.h> /* calloc() */ |
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| 38 | |
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[23c4bbf5] | 39 | #include <rtems/libio.h> /* libio.h not pulled in by rtems */ |
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[cca4400] | 40 | |
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| 41 | /* |
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| 42 | * File descriptor Table Information |
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| 43 | */ |
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| 44 | |
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| 45 | extern unsigned32 rtems_libio_number_iops; |
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| 46 | rtems_id rtems_libio_semaphore; |
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| 47 | rtems_libio_t *rtems_libio_iops; |
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| 48 | rtems_libio_t *rtems_libio_iop_freelist; |
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[b06e68ef] | 49 | |
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| 50 | /* |
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[07a3253d] | 51 | * rtems_libio_init |
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| 52 | * |
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| 53 | * Called by BSP startup code to initialize the libio subsystem. |
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[b06e68ef] | 54 | */ |
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| 55 | |
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[07a3253d] | 56 | void rtems_libio_init( void ) |
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[b06e68ef] | 57 | { |
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[cca4400] | 58 | rtems_status_code rc; |
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| 59 | int i; |
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| 60 | rtems_libio_t *iop; |
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| 61 | |
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| 62 | if (rtems_libio_number_iops > 0) |
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| 63 | { |
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| 64 | rtems_libio_iops = (rtems_libio_t *) calloc(rtems_libio_number_iops, |
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| 65 | sizeof(rtems_libio_t)); |
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| 66 | if (rtems_libio_iops == NULL) |
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| 67 | rtems_fatal_error_occurred(RTEMS_NO_MEMORY); |
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| 68 | |
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| 69 | iop = rtems_libio_iop_freelist = rtems_libio_iops; |
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| 70 | for (i = 0 ; i < (rtems_libio_number_iops - 1) ; i++, iop++) |
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| 71 | iop->data1 = iop + 1; |
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| 72 | iop->data1 = NULL; |
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| 73 | } |
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[07a3253d] | 74 | |
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| 75 | /* |
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| 76 | * Create the binary semaphore used to provide mutual exclusion |
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| 77 | * on the IOP Table. |
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| 78 | */ |
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| 79 | |
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| 80 | rc = rtems_semaphore_create( |
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| 81 | RTEMS_LIBIO_SEM, |
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| 82 | 1, |
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| 83 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 84 | RTEMS_NO_PRIORITY, |
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| 85 | &rtems_libio_semaphore |
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| 86 | ); |
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| 87 | if ( rc != RTEMS_SUCCESSFUL ) |
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| 88 | rtems_fatal_error_occurred( rc ); |
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| 89 | |
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| 90 | /* |
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| 91 | * Initialize the base file system infrastructure. |
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| 92 | */ |
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| 93 | |
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| 94 | rtems_filesystem_initialize(); |
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[b06e68ef] | 95 | } |
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| 96 | |
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| 97 | /* |
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[07a3253d] | 98 | * rtems_libio_fcntl_flags |
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| 99 | * |
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| 100 | * Convert UNIX fnctl(2) flags to ones that RTEMS drivers understand |
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[b06e68ef] | 101 | */ |
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| 102 | |
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| 103 | rtems_assoc_t access_modes_assoc[] = { |
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[07a3253d] | 104 | { "READ", LIBIO_FLAGS_READ, O_RDONLY }, |
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| 105 | { "WRITE", LIBIO_FLAGS_WRITE, O_WRONLY }, |
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| 106 | { "READ/WRITE", LIBIO_FLAGS_READ_WRITE, O_RDWR }, |
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| 107 | { 0, 0, 0 }, |
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[b06e68ef] | 108 | }; |
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| 109 | |
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| 110 | rtems_assoc_t status_flags_assoc[] = { |
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[07a3253d] | 111 | { "NO DELAY", LIBIO_FLAGS_NO_DELAY, O_NDELAY }, |
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[5a9a5ec] | 112 | { "NONBLOCK", LIBIO_FLAGS_NO_DELAY, O_NONBLOCK }, |
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[07a3253d] | 113 | { "APPEND", LIBIO_FLAGS_APPEND, O_APPEND }, |
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| 114 | { "CREATE", LIBIO_FLAGS_CREATE, O_CREAT }, |
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| 115 | { 0, 0, 0 }, |
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[b06e68ef] | 116 | }; |
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| 117 | |
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[07a3253d] | 118 | unsigned32 rtems_libio_fcntl_flags( |
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| 119 | unsigned32 fcntl_flags |
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| 120 | ) |
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[b06e68ef] | 121 | { |
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[07a3253d] | 122 | unsigned32 flags = 0; |
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| 123 | unsigned32 access_modes; |
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[b06e68ef] | 124 | |
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[07a3253d] | 125 | /* |
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| 126 | * Access mode is a small integer |
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| 127 | */ |
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| 128 | |
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| 129 | access_modes = fcntl_flags & O_ACCMODE; |
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| 130 | fcntl_flags &= ~O_ACCMODE; |
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| 131 | flags = rtems_assoc_local_by_remote( access_modes_assoc, access_modes ); |
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[b06e68ef] | 132 | |
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[07a3253d] | 133 | /* |
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| 134 | * Everything else is single bits |
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| 135 | */ |
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[b06e68ef] | 136 | |
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[07a3253d] | 137 | flags |= |
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| 138 | rtems_assoc_local_by_remote_bitfield(status_flags_assoc, fcntl_flags); |
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| 139 | return flags; |
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[b06e68ef] | 140 | } |
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| 141 | |
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[3ef8798] | 142 | /* |
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| 143 | * rtems_libio_to_fcntl_flags |
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| 144 | * |
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| 145 | * Convert RTEMS internal flags to UNIX fnctl(2) flags |
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| 146 | */ |
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| 147 | |
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| 148 | unsigned32 rtems_libio_to_fcntl_flags( |
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| 149 | unsigned32 flags |
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| 150 | ) |
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| 151 | { |
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| 152 | unsigned32 fcntl_flags = 0; |
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| 153 | |
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[3195d9c] | 154 | if ( (flags & LIBIO_FLAGS_READ_WRITE) == LIBIO_FLAGS_READ_WRITE ) { |
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| 155 | fcntl_flags |= O_RDWR; |
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| 156 | } else if ( (flags & LIBIO_FLAGS_READ) == LIBIO_FLAGS_READ) { |
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| 157 | fcntl_flags |= O_RDONLY; |
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| 158 | } else if ( (flags & LIBIO_FLAGS_WRITE) == LIBIO_FLAGS_WRITE) { |
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| 159 | fcntl_flags |= O_WRONLY; |
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| 160 | } |
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| 161 | |
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| 162 | if ( (flags & LIBIO_FLAGS_NO_DELAY) == LIBIO_FLAGS_NO_DELAY ) { |
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| 163 | fcntl_flags |= O_NDELAY; |
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| 164 | } |
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| 165 | |
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| 166 | if ( (flags & LIBIO_FLAGS_APPEND) == LIBIO_FLAGS_APPEND ) { |
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| 167 | fcntl_flags |= O_APPEND; |
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| 168 | } |
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| 169 | |
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| 170 | if ( (flags & LIBIO_FLAGS_CREATE) == LIBIO_FLAGS_CREATE ) { |
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| 171 | fcntl_flags |= O_CREAT; |
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| 172 | } |
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| 173 | |
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[3ef8798] | 174 | return fcntl_flags; |
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| 175 | } |
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| 176 | |
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[07a3253d] | 177 | /* |
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| 178 | * rtems_libio_allocate |
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| 179 | * |
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| 180 | * This routine searches the IOP Table for an unused entry. If it |
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| 181 | * finds one, it returns it. Otherwise, it returns NULL. |
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| 182 | */ |
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[b06e68ef] | 183 | |
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[07a3253d] | 184 | rtems_libio_t *rtems_libio_allocate( void ) |
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[b06e68ef] | 185 | { |
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[07a3253d] | 186 | rtems_libio_t *iop; |
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| 187 | rtems_status_code rc; |
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| 188 | |
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| 189 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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| 190 | |
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[cca4400] | 191 | if (rtems_libio_iop_freelist) { |
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| 192 | iop = rtems_libio_iop_freelist; |
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| 193 | rc = rtems_semaphore_create( |
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| 194 | RTEMS_LIBIO_IOP_SEM(iop - rtems_libio_iops), |
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| 195 | 1, |
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| 196 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 197 | RTEMS_NO_PRIORITY, |
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| 198 | &iop->sem |
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| 199 | ); |
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| 200 | if (rc != RTEMS_SUCCESSFUL) |
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| 201 | goto failed; |
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| 202 | rtems_libio_iop_freelist = iop->data1; |
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| 203 | iop->data1 = 0; |
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| 204 | iop->flags = LIBIO_FLAGS_OPEN; |
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| 205 | goto done; |
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[07a3253d] | 206 | } |
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| 207 | |
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[b06e68ef] | 208 | failed: |
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[07a3253d] | 209 | iop = 0; |
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| 210 | |
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[b06e68ef] | 211 | done: |
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[07a3253d] | 212 | rtems_semaphore_release( rtems_libio_semaphore ); |
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| 213 | return iop; |
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[b06e68ef] | 214 | } |
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| 215 | |
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[07a3253d] | 216 | /* |
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| 217 | * rtems_libio_free |
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| 218 | * |
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| 219 | * This routine frees the resources associated with an IOP (file descriptor) |
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| 220 | * and clears the slot in the IOP Table. |
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| 221 | */ |
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[b06e68ef] | 222 | |
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[07a3253d] | 223 | void rtems_libio_free( |
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| 224 | rtems_libio_t *iop |
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| 225 | ) |
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[b06e68ef] | 226 | { |
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[07a3253d] | 227 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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[b06e68ef] | 228 | |
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[cca4400] | 229 | if (iop->sem) |
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| 230 | rtems_semaphore_delete(iop->sem); |
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[b06e68ef] | 231 | |
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[77c81fd2] | 232 | iop->flags &= ~LIBIO_FLAGS_OPEN; |
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[cca4400] | 233 | iop->data1 = rtems_libio_iop_freelist; |
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| 234 | rtems_libio_iop_freelist = iop; |
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[b06e68ef] | 235 | |
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[cca4400] | 236 | rtems_semaphore_release(rtems_libio_semaphore); |
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[07a3253d] | 237 | } |
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[b06e68ef] | 238 | |
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[07a3253d] | 239 | /* |
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| 240 | * rtems_libio_is_open_files_in_fs |
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| 241 | * |
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| 242 | * This routine scans the entire file descriptor table to determine if the |
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[cca4400] | 243 | * are any active file descriptors that refer to the at least one node in the |
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[07a3253d] | 244 | * file system that we are trying to dismount. |
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| 245 | * |
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| 246 | * If there is at least one node in the file system referenced by the mount |
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| 247 | * table entry a 1 is returned, otherwise a 0 is returned. |
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| 248 | */ |
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[78d87bd] | 249 | |
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[07a3253d] | 250 | int rtems_libio_is_open_files_in_fs( |
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| 251 | rtems_filesystem_mount_table_entry_t * fs_mt_entry |
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| 252 | ) |
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[b06e68ef] | 253 | { |
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[07a3253d] | 254 | rtems_libio_t *iop; |
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| 255 | int result = 0; |
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[77c81fd2] | 256 | int i; |
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[b06e68ef] | 257 | |
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[07a3253d] | 258 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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[cca4400] | 259 | |
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[07a3253d] | 260 | /* |
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| 261 | * Look for any active file descriptor entry. |
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[cca4400] | 262 | */ |
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| 263 | |
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[df49c60] | 264 | for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){ |
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[cca4400] | 265 | |
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[07a3253d] | 266 | if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { |
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[cca4400] | 267 | |
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[07a3253d] | 268 | /* |
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| 269 | * Check if this node is under the file system that we |
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| 270 | * are trying to dismount. |
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[cca4400] | 271 | */ |
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[b06e68ef] | 272 | |
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[07a3253d] | 273 | if ( iop->pathinfo.mt_entry == fs_mt_entry ) { |
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| 274 | result = 1; |
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| 275 | break; |
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| 276 | } |
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[e2d79559] | 277 | } |
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[07a3253d] | 278 | } |
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[b06e68ef] | 279 | |
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[07a3253d] | 280 | rtems_semaphore_release( rtems_libio_semaphore ); |
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[cca4400] | 281 | |
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[07a3253d] | 282 | return result; |
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[b06e68ef] | 283 | } |
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| 284 | |
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[07a3253d] | 285 | /* |
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| 286 | * rtems_libio_is_file_open |
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| 287 | * |
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| 288 | * This routine scans the entire file descriptor table to determine if the |
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| 289 | * given file refers to an active file descriptor. |
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[cca4400] | 290 | * |
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[07a3253d] | 291 | * If the given file is open a 1 is returned, otherwise a 0 is returned. |
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| 292 | */ |
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[b06e68ef] | 293 | |
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[07a3253d] | 294 | int rtems_libio_is_file_open( |
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| 295 | void *node_access |
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| 296 | ) |
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| 297 | { |
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| 298 | rtems_libio_t *iop; |
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[cca4400] | 299 | int result=0; |
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[77c81fd2] | 300 | int i; |
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[b06e68ef] | 301 | |
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[07a3253d] | 302 | rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); |
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[b06e68ef] | 303 | |
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[07a3253d] | 304 | /* |
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| 305 | * Look for any active file descriptor entry. |
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| 306 | */ |
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[cca4400] | 307 | |
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[df49c60] | 308 | for (iop=rtems_libio_iops,i=0; i < rtems_libio_number_iops; iop++, i++){ |
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[07a3253d] | 309 | if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { |
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[cca4400] | 310 | |
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[07a3253d] | 311 | /* |
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| 312 | * Check if this node is under the file system that we |
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| 313 | * are trying to dismount. |
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[cca4400] | 314 | */ |
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[b06e68ef] | 315 | |
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[07a3253d] | 316 | if ( iop->pathinfo.node_access == node_access ) { |
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| 317 | result = 1; |
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| 318 | break; |
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| 319 | } |
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| 320 | } |
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| 321 | } |
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[e2d79559] | 322 | |
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[07a3253d] | 323 | rtems_semaphore_release( rtems_libio_semaphore ); |
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[b06e68ef] | 324 | |
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[07a3253d] | 325 | return result; |
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[b06e68ef] | 326 | } |
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[cca4400] | 327 | |
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| 328 | |
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