[c9bb60a] | 1 | /** |
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| 2 | * @file |
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[07a3253d] | 3 | * |
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[c9bb60a] | 4 | * @brief Open a File |
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| 5 | * @ingroup libcsupport |
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| 6 | */ |
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| 7 | |
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| 8 | /* |
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[4af849f] | 9 | * COPYRIGHT (c) 1989-2010. |
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[07a3253d] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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[3b7c123] | 12 | * Modifications to support reference counting in the file system are |
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| 13 | * Copyright (c) 2012 embedded brains GmbH. |
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| 14 | * |
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[07a3253d] | 15 | * The license and distribution terms for this file may be |
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| 16 | * found in the file LICENSE in this distribution or at |
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[c499856] | 17 | * http://www.rtems.org/license/LICENSE. |
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[07a3253d] | 18 | */ |
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| 19 | |
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[9c49db4] | 20 | #if HAVE_CONFIG_H |
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[3b7c123] | 21 | #include "config.h" |
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[9c49db4] | 22 | #endif |
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| 23 | |
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[3b7c123] | 24 | #include <sys/stat.h> |
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[a02224e] | 25 | #include <fcntl.h> |
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[3b7c123] | 26 | #include <stdarg.h> |
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[07a3253d] | 27 | #include <unistd.h> |
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| 28 | |
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[3b7c123] | 29 | #include <rtems/libio_.h> |
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[07a3253d] | 30 | |
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[3b7c123] | 31 | static void create_regular_file( |
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| 32 | rtems_filesystem_eval_path_context_t *ctx, |
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| 33 | mode_t mode |
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[07a3253d] | 34 | ) |
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| 35 | { |
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[3b7c123] | 36 | int rv = 0; |
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| 37 | const rtems_filesystem_location_info_t *currentloc = |
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| 38 | rtems_filesystem_eval_path_get_currentloc( ctx ); |
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| 39 | const char *token = rtems_filesystem_eval_path_get_token( ctx ); |
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| 40 | size_t tokenlen = rtems_filesystem_eval_path_get_tokenlen( ctx ); |
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| 41 | |
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| 42 | rv = rtems_filesystem_mknod( |
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| 43 | currentloc, |
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| 44 | token, |
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| 45 | tokenlen, |
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| 46 | S_IFREG | mode, |
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| 47 | 0 |
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| 48 | ); |
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| 49 | |
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| 50 | if ( rv == 0 ) { |
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| 51 | /* The mode only applies to future accesses of the newly created file */ |
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| 52 | rtems_filesystem_eval_path_set_flags( ctx, 0 ); |
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| 53 | |
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| 54 | rtems_filesystem_eval_path_set_path( ctx, token, tokenlen ); |
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| 55 | rtems_filesystem_eval_path_continue( ctx ); |
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| 56 | } else { |
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| 57 | rtems_filesystem_eval_path_error( ctx, 0 ); |
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| 58 | } |
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| 59 | } |
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[07a3253d] | 60 | |
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[3b7c123] | 61 | static int do_open( |
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| 62 | rtems_libio_t *iop, |
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| 63 | const char *path, |
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| 64 | int oflag, |
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| 65 | mode_t mode |
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| 66 | ) |
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| 67 | { |
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| 68 | int rv = 0; |
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| 69 | int fd = iop - rtems_libio_iops; |
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| 70 | int rwflag = oflag + 1; |
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| 71 | bool read_access = (rwflag & _FREAD) == _FREAD; |
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| 72 | bool write_access = (rwflag & _FWRITE) == _FWRITE; |
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| 73 | bool make = (oflag & O_CREAT) == O_CREAT; |
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| 74 | bool exclusive = (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL); |
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| 75 | bool truncate = (oflag & O_TRUNC) == O_TRUNC; |
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[2563410] | 76 | int eval_flags = RTEMS_FS_FOLLOW_LINK |
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| 77 | | (read_access ? RTEMS_FS_PERMS_READ : 0) |
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| 78 | | (write_access ? RTEMS_FS_PERMS_WRITE : 0) |
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| 79 | | (make ? RTEMS_FS_MAKE : 0) |
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| 80 | | (exclusive ? RTEMS_FS_EXCLUSIVE : 0); |
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[3b7c123] | 81 | rtems_filesystem_eval_path_context_t ctx; |
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| 82 | |
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| 83 | rtems_filesystem_eval_path_start( &ctx, path, eval_flags ); |
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| 84 | |
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| 85 | if ( rtems_filesystem_eval_path_has_token( &ctx ) ) { |
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| 86 | create_regular_file( &ctx, mode ); |
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[07a3253d] | 87 | } |
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| 88 | |
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[3b7c123] | 89 | if ( write_access ) { |
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| 90 | const rtems_filesystem_location_info_t *currentloc = |
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| 91 | rtems_filesystem_eval_path_get_currentloc( &ctx ); |
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[c625a641] | 92 | mode_t type = rtems_filesystem_location_type( currentloc ); |
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[07a3253d] | 93 | |
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[c625a641] | 94 | if ( S_ISDIR( type ) ) { |
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[3b7c123] | 95 | rtems_filesystem_eval_path_error( &ctx, EISDIR ); |
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[07a3253d] | 96 | } |
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[3b7c123] | 97 | } |
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[07a3253d] | 98 | |
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[3b7c123] | 99 | iop->flags |= rtems_libio_fcntl_flags( oflag ); |
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| 100 | rtems_filesystem_eval_path_extract_currentloc( &ctx, &iop->pathinfo ); |
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| 101 | rtems_filesystem_eval_path_cleanup( &ctx ); |
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[07a3253d] | 102 | |
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[3b7c123] | 103 | rv = (*iop->pathinfo.handlers->open_h)( iop, path, oflag, mode ); |
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| 104 | |
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| 105 | if ( rv == 0 ) { |
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| 106 | if ( truncate ) { |
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| 107 | rv = ftruncate( fd, 0 ); |
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| 108 | if ( rv != 0 ) { |
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| 109 | (*iop->pathinfo.handlers->close_h)( iop ); |
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| 110 | } |
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[07a3253d] | 111 | } |
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| 112 | |
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[3b7c123] | 113 | if ( rv == 0 ) { |
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| 114 | rv = fd; |
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| 115 | } else { |
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| 116 | rv = -1; |
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[07a3253d] | 117 | } |
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[3b7c123] | 118 | } |
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[07a3253d] | 119 | |
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[3b7c123] | 120 | if ( rv < 0 ) { |
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| 121 | rtems_libio_free( iop ); |
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[07a3253d] | 122 | } |
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| 123 | |
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[3b7c123] | 124 | return rv; |
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| 125 | } |
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| 126 | |
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[c9bb60a] | 127 | /** |
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| 128 | * POSIX 1003.1 5.3.1 - Open a File |
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| 129 | */ |
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[3b7c123] | 130 | int open( const char *path, int oflag, ... ) |
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| 131 | { |
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| 132 | int rv = 0; |
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| 133 | va_list ap; |
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| 134 | mode_t mode = 0; |
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| 135 | rtems_libio_t *iop = NULL; |
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[efb5450] | 136 | |
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[3b7c123] | 137 | va_start( ap, oflag ); |
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[07a3253d] | 138 | |
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[3b7c123] | 139 | mode = va_arg( ap, mode_t ); |
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[07a3253d] | 140 | |
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[3b7c123] | 141 | iop = rtems_libio_allocate(); |
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| 142 | if ( iop != NULL ) { |
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| 143 | rv = do_open( iop, path, oflag, mode ); |
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| 144 | } else { |
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| 145 | errno = ENFILE; |
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| 146 | rv = -1; |
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[07a3253d] | 147 | } |
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[50f32b11] | 148 | |
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[3b7c123] | 149 | va_end( ap ); |
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[d71fcab] | 150 | |
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[3b7c123] | 151 | return rv; |
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[07a3253d] | 152 | } |
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| 153 | |
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[c9bb60a] | 154 | |
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[07a3253d] | 155 | |
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[a13c3df] | 156 | #if defined(RTEMS_NEWLIB) && !defined(HAVE__OPEN_R) |
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[07a3253d] | 157 | |
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| 158 | #include <reent.h> |
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| 159 | |
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[c9bb60a] | 160 | /** |
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| 161 | * This is the Newlib dependent reentrant version of open(). |
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| 162 | */ |
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[07a3253d] | 163 | int _open_r( |
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[9e14ca2] | 164 | struct _reent *ptr __attribute__((unused)), |
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[07a3253d] | 165 | const char *buf, |
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[3b7c123] | 166 | int oflag, |
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[07a3253d] | 167 | int mode |
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| 168 | ) |
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| 169 | { |
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[3b7c123] | 170 | return open( buf, oflag, mode ); |
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[07a3253d] | 171 | } |
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| 172 | #endif |
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