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go1: update recipe for recovering Stat_t

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Fixes #2983.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5654063
This commit is contained in:
Rob Pike 2012-02-12 09:17:57 +11:00
parent 14efdea359
commit 46dc76f5da
2 changed files with 8 additions and 16 deletions
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12
doc/go1.html
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@ -1420,6 +1420,7 @@ changing it from a struct to an interface:
Mode() FileMode // file mode bits Mode() FileMode // file mode bits
ModTime() time.Time // modification time ModTime() time.Time // modification time
IsDir() bool // abbreviation for Mode().IsDir() IsDir() bool // abbreviation for Mode().IsDir()
Sys() interface{} // underlying data source (can return nil)
} }
</pre> </pre>
@ -1435,7 +1436,7 @@ The system-specific details of file modes and properties such as (on Unix)
i-number have been removed from <code>FileInfo</code> altogether. i-number have been removed from <code>FileInfo</code> altogether.
Instead, each operating system's <code>os</code> package provides an Instead, each operating system's <code>os</code> package provides an
implementation of the <code>FileInfo</code> interface, <code>*os.FileStat</code>, implementation of the <code>FileInfo</code> interface, <code>*os.FileStat</code>,
which in turn contains a <code>Sys</code> field that stores the which has a <code>Sys</code> method that returns the
system-specific representation of file metadata. system-specific representation of file metadata.
For instance, to discover the i-number of a file on a Unix system, unpack For instance, to discover the i-number of a file on a Unix system, unpack
the <code>FileInfo</code> like this: the <code>FileInfo</code> like this:
@ -1446,13 +1447,8 @@ the <code>FileInfo</code> like this:
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
// Make sure it's an implementation known to package os. // Check that it's a Unix file.
fileStat, ok := fi.(*os.FileStat) unixStat, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
log.Fatal("hello.go: not an os File")
}
// Now check that it's a Unix file.
unixStat, ok := fileStat.Sys.(*syscall.Stat_t)
if !ok { if !ok {
log.Fatal("hello.go: not a Unix file") log.Fatal("hello.go: not a Unix file")
} }

12
doc/go1.tmpl
View File

@ -1323,6 +1323,7 @@ changing it from a struct to an interface:
Mode() FileMode // file mode bits Mode() FileMode // file mode bits
ModTime() time.Time // modification time ModTime() time.Time // modification time
IsDir() bool // abbreviation for Mode().IsDir() IsDir() bool // abbreviation for Mode().IsDir()
Sys() interface{} // underlying data source (can return nil)
} }
</pre> </pre>
@ -1338,7 +1339,7 @@ The system-specific details of file modes and properties such as (on Unix)
i-number have been removed from <code>FileInfo</code> altogether. i-number have been removed from <code>FileInfo</code> altogether.
Instead, each operating system's <code>os</code> package provides an Instead, each operating system's <code>os</code> package provides an
implementation of the <code>FileInfo</code> interface, <code>*os.FileStat</code>, implementation of the <code>FileInfo</code> interface, <code>*os.FileStat</code>,
which in turn contains a <code>Sys</code> field that stores the which has a <code>Sys</code> method that returns the
system-specific representation of file metadata. system-specific representation of file metadata.
For instance, to discover the i-number of a file on a Unix system, unpack For instance, to discover the i-number of a file on a Unix system, unpack
the <code>FileInfo</code> like this: the <code>FileInfo</code> like this:
@ -1349,13 +1350,8 @@ the <code>FileInfo</code> like this:
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
// Make sure it's an implementation known to package os. // Check that it's a Unix file.
fileStat, ok := fi.(*os.FileStat) unixStat, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
log.Fatal("hello.go: not an os File")
}
// Now check that it's a Unix file.
unixStat, ok := fileStat.Sys.(*syscall.Stat_t)
if !ok { if !ok {
log.Fatal("hello.go: not a Unix file") log.Fatal("hello.go: not a Unix file")
} }