diff options
| author | Mistivia <i@mistivia.com> | 2025-11-02 15:27:18 +0800 |
|---|---|---|
| committer | Mistivia <i@mistivia.com> | 2025-11-02 15:27:18 +0800 |
| commit | e9c24f4af7ed56760f6db7941827d09f6db9020b (patch) | |
| tree | 62128c43b883ce5e3148113350978755779bb5de /teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go | |
| parent | 58d5e7cfda4781d8a57ec52aefd02983835c301a (diff) | |
add matterbridge
Diffstat (limited to 'teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go')
| -rw-r--r-- | teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go b/teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go new file mode 100644 index 0000000..db90f55 --- /dev/null +++ b/teleirc/matterbridge/vendor/modernc.org/libc/ioutil_linux.go @@ -0,0 +1,70 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE-GO file. + +// Modifications Copyright 2020 The Libc Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package libc // import "modernc.org/libc" + +import ( + "fmt" + "os" + "sync" + "time" + "unsafe" + + "golang.org/x/sys/unix" + "modernc.org/libc/errno" + "modernc.org/libc/fcntl" +) + +// Random number state. +// 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. +var randState uint32 +var randStateMu sync.Mutex + +func reseed() uint32 { + return uint32(time.Now().UnixNano() + int64(os.Getpid())) +} + +func nextRandom(x uintptr) { + randStateMu.Lock() + r := randState + if r == 0 { + r = reseed() + } + r = r*1664525 + 1013904223 // constants from Numerical Recipes + randState = r + randStateMu.Unlock() + copy((*RawMem)(unsafe.Pointer(x))[:6:6], fmt.Sprintf("%06d", int(1e9+r%1e9)%1e6)) +} + +func tempFile(s, x uintptr, flags int32) (fd int, err error) { + const maxTry = 10000 + nconflict := 0 + flags |= int32(os.O_RDWR | os.O_CREATE | os.O_EXCL | unix.O_LARGEFILE) + for i := 0; i < maxTry; i++ { + nextRandom(x) + fdcwd := fcntl.AT_FDCWD + n, _, err := unix.Syscall6(unix.SYS_OPENAT, uintptr(fdcwd), s, uintptr(flags), 0600, 0, 0) + if err == 0 { + return int(n), nil + } + + if err != errno.EEXIST { + return -1, err + } + + if nconflict++; nconflict > 10 { + randStateMu.Lock() + randState = reseed() + nconflict = 0 + randStateMu.Unlock() + } + } + return -1, unix.Errno(errno.EEXIST) +} |
