author | Mikael Berthe <mikael@lilotux.net> |
Sat, 04 Feb 2023 12:58:35 +0100 | |
changeset 265 | 05c40b36d3b2 |
permissions | -rw-r--r-- |
265
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//go:build solaris |
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// +build solaris |
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package fsnotify |
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import ( |
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"errors" |
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) |
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// Watcher watches a set of paths, delivering events on a channel. |
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// |
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// A watcher should not be copied (e.g. pass it by pointer, rather than by |
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// value). |
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// |
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// # Linux notes |
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// |
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// When a file is removed a Remove event won't be emitted until all file |
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// descriptors are closed, and deletes will always emit a Chmod. For example: |
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// |
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// fp := os.Open("file") |
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// os.Remove("file") // Triggers Chmod |
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// fp.Close() // Triggers Remove |
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// |
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// This is the event that inotify sends, so not much can be changed about this. |
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// |
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// The fs.inotify.max_user_watches sysctl variable specifies the upper limit |
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// for the number of watches per user, and fs.inotify.max_user_instances |
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// specifies the maximum number of inotify instances per user. Every Watcher you |
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// create is an "instance", and every path you add is a "watch". |
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// |
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// These are also exposed in /proc as /proc/sys/fs/inotify/max_user_watches and |
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// /proc/sys/fs/inotify/max_user_instances |
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// |
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// To increase them you can use sysctl or write the value to the /proc file: |
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// |
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// # Default values on Linux 5.18 |
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// sysctl fs.inotify.max_user_watches=124983 |
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// sysctl fs.inotify.max_user_instances=128 |
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// |
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// To make the changes persist on reboot edit /etc/sysctl.conf or |
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// /usr/lib/sysctl.d/50-default.conf (details differ per Linux distro; check |
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// your distro's documentation): |
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// |
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// fs.inotify.max_user_watches=124983 |
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// fs.inotify.max_user_instances=128 |
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// |
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// Reaching the limit will result in a "no space left on device" or "too many open |
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// files" error. |
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// |
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// # kqueue notes (macOS, BSD) |
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// |
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// kqueue requires opening a file descriptor for every file that's being watched; |
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// so if you're watching a directory with five files then that's six file |
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// descriptors. You will run in to your system's "max open files" limit faster on |
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// these platforms. |
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// |
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// The sysctl variables kern.maxfiles and kern.maxfilesperproc can be used to |
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// control the maximum number of open files, as well as /etc/login.conf on BSD |
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// systems. |
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// |
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// # macOS notes |
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// |
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// Spotlight indexing on macOS can result in multiple events (see [#15]). A |
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// temporary workaround is to add your folder(s) to the "Spotlight Privacy |
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// Settings" until we have a native FSEvents implementation (see [#11]). |
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// |
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// [#11]: https://github.com/fsnotify/fsnotify/issues/11 |
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// [#15]: https://github.com/fsnotify/fsnotify/issues/15 |
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type Watcher struct { |
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// Events sends the filesystem change events. |
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// |
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// fsnotify can send the following events; a "path" here can refer to a |
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// file, directory, symbolic link, or special file like a FIFO. |
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// |
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// fsnotify.Create A new path was created; this may be followed by one |
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// or more Write events if data also gets written to a |
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// file. |
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// |
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// fsnotify.Remove A path was removed. |
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// |
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// fsnotify.Rename A path was renamed. A rename is always sent with the |
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// old path as Event.Name, and a Create event will be |
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// sent with the new name. Renames are only sent for |
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// paths that are currently watched; e.g. moving an |
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// unmonitored file into a monitored directory will |
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// show up as just a Create. Similarly, renaming a file |
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// to outside a monitored directory will show up as |
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// only a Rename. |
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// |
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// fsnotify.Write A file or named pipe was written to. A Truncate will |
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// also trigger a Write. A single "write action" |
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// initiated by the user may show up as one or multiple |
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// writes, depending on when the system syncs things to |
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// disk. For example when compiling a large Go program |
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// you may get hundreds of Write events, so you |
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// probably want to wait until you've stopped receiving |
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// them (see the dedup example in cmd/fsnotify). |
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// |
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// fsnotify.Chmod Attributes were changed. On Linux this is also sent |
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// when a file is removed (or more accurately, when a |
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// link to an inode is removed). On kqueue it's sent |
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// and on kqueue when a file is truncated. On Windows |
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103 |
// it's never sent. |
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104 |
Events chan Event |
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105 |
|
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106 |
// Errors sends any errors. |
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107 |
Errors chan error |
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108 |
} |
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109 |
|
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110 |
// NewWatcher creates a new Watcher. |
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111 |
func NewWatcher() (*Watcher, error) { |
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112 |
return nil, errors.New("FEN based watcher not yet supported for fsnotify\n") |
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113 |
} |
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114 |
|
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115 |
// Close removes all watches and closes the events channel. |
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116 |
func (w *Watcher) Close() error { |
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117 |
return nil |
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118 |
} |
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119 |
|
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120 |
// Add starts monitoring the path for changes. |
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121 |
// |
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122 |
// A path can only be watched once; attempting to watch it more than once will |
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123 |
// return an error. Paths that do not yet exist on the filesystem cannot be |
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124 |
// added. A watch will be automatically removed if the path is deleted. |
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125 |
// |
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126 |
// A path will remain watched if it gets renamed to somewhere else on the same |
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127 |
// filesystem, but the monitor will get removed if the path gets deleted and |
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128 |
// re-created, or if it's moved to a different filesystem. |
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129 |
// |
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130 |
// Notifications on network filesystems (NFS, SMB, FUSE, etc.) or special |
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131 |
// filesystems (/proc, /sys, etc.) generally don't work. |
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132 |
// |
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133 |
// # Watching directories |
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134 |
// |
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135 |
// All files in a directory are monitored, including new files that are created |
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136 |
// after the watcher is started. Subdirectories are not watched (i.e. it's |
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137 |
// non-recursive). |
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138 |
// |
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139 |
// # Watching files |
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140 |
// |
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141 |
// Watching individual files (rather than directories) is generally not |
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142 |
// recommended as many tools update files atomically. Instead of "just" writing |
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143 |
// to the file a temporary file will be written to first, and if successful the |
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144 |
// temporary file is moved to to destination removing the original, or some |
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145 |
// variant thereof. The watcher on the original file is now lost, as it no |
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146 |
// longer exists. |
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147 |
// |
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148 |
// Instead, watch the parent directory and use Event.Name to filter out files |
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149 |
// you're not interested in. There is an example of this in [cmd/fsnotify/file.go]. |
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150 |
func (w *Watcher) Add(name string) error { |
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151 |
return nil |
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152 |
} |
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153 |
|
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154 |
// Remove stops monitoring the path for changes. |
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155 |
// |
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156 |
// Directories are always removed non-recursively. For example, if you added |
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157 |
// /tmp/dir and /tmp/dir/subdir then you will need to remove both. |
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158 |
// |
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159 |
// Removing a path that has not yet been added returns [ErrNonExistentWatch]. |
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160 |
func (w *Watcher) Remove(name string) error { |
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161 |
return nil |
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162 |
} |