static/jsvm/modules/os.html
Package os provides a platform-independent interface to operating system functionality. The design is Unix-like, although the error handling is Go-like; failing calls return values of type error rather than error numbers. Often, more information is available within the error. For example, if a call that takes a file name fails, such as [Open] or [Stat], the error will include the failing file name when printed and will be of type [*PathError], which may be unpacked for more information.
The os interface is intended to be uniform across all operating systems. Features not generally available appear in the system-specific package syscall.
Here is a simple example, opening a file and reading some of it.
file, err := os.Open("file.go") // For read access. if err != nil { log.Fatal(err) }Copy
If the open fails, the error string will be self-explanatory, like
open file.go: no such file or directoryCopy
The file's data can then be read into a slice of bytes. Read and Write take their byte counts from the length of the argument slice.
data := make([]byte, 100) count, err := file.Read(data) if err != nil { log.Fatal(err) } fmt.Printf("read %d bytes: %q\n", count, data[:count])Copy
The methods of [File] correspond to file system operations. All are safe for concurrent use. The maximum number of concurrent operations on a File may be limited by the OS or the system. The number should be high, but exceeding it may degrade performance or cause other issues.
DirEntryFileFileInfoFileModeLinkErrorPathErrorProcAttrProcessProcessStateRootSignalSyscallErrorchdirchmodchownchtimesclearenvcopyFScreatecreateTempdirFSdirInfoenvironerrSymlinkexecutableexitexpandexpandEnvfilefileStatfileWithoutReadFromfileWithoutWriteTofindProcessgetegidgetenvgeteuidgetgidgetgroupsgetpagesizegetpidgetppidgetuidgetwdhostnameisExistisNotExistisPathSeparatorisPermissionisTimeoutlchownlinklookupEnvlstatmkdirmkdirAllmkdirTempnewFilenewFileKindnewSyscallErrornoReadFromnoWriteToopenopenFileopenInRootopenRootpipeprocessModeprocessStatusrawConnreadDirreadFilereaddirModereadlinkremoveremoveAllrenamerootrootFSsameFilesetenvstartProcessstatsymlinksyscallErrorTypesysfdTypetempDirtimeouttruncateunixDirentunsetenvuserCacheDiruserConfigDiruserHomeDirwriteFile
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