// random number source provided by runtime. // We generate random temporary file names so that there's a good // chance the file doesn't exist yet - keeps the number of tries in // TempFile to a minimum. // //go:linkname runtime_rand runtime.rand func runtime_rand() uint64 func nextRandom() string { … } // CreateTemp creates a new temporary file in the directory dir, // opens the file for reading and writing, and returns the resulting file. // The filename is generated by taking pattern and adding a random string to the end. // If pattern includes a "*", the random string replaces the last "*". // The file is created with mode 0o600 (before umask). // If dir is the empty string, CreateTemp uses the default directory for temporary files, as returned by [TempDir]. // Multiple programs or goroutines calling CreateTemp simultaneously will not choose the same file. // The caller can use the file's Name method to find the pathname of the file. // It is the caller's responsibility to remove the file when it is no longer needed. func CreateTemp(dir, pattern string) (*File, error) { … } var errPatternHasSeparator … // prefixAndSuffix splits pattern by the last wildcard "*", if applicable, // returning prefix as the part before "*" and suffix as the part after "*". func prefixAndSuffix(pattern string) (prefix, suffix string, err error) { … } // MkdirTemp creates a new temporary directory in the directory dir // and returns the pathname of the new directory. // The new directory's name is generated by adding a random string to the end of pattern. // If pattern includes a "*", the random string replaces the last "*" instead. // The directory is created with mode 0o700 (before umask). // If dir is the empty string, MkdirTemp uses the default directory for temporary files, as returned by TempDir. // Multiple programs or goroutines calling MkdirTemp simultaneously will not choose the same directory. // It is the caller's responsibility to remove the directory when it is no longer needed. func MkdirTemp(dir, pattern string) (string, error) { … } func joinPath(dir, name string) string { … }
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