stat_portable.go RawHistoryFolder

1// SPDX-License-Identifier: MIT
2
3//go:build (linux && !(amd64 || arm64)) || darwin || freebsd || openbsd || netbsd || dragonfly
4
5package git
6
7import "syscall"
8
9// statNul fills st with a stat system call into a Stat_t on the stack. The
10// one allocation is the NUL-free copy of the path that package syscall turns
11// into a C string at each call; stat_linux.go avoids it where the system call
12// can be made directly.
13func statNul(nul []byte, lstat bool, st *fileStat) error {
14	var sys syscall.Stat_t
15	path := string(nul[:len(nul)-1])
16	var err error
17	for {
18		if lstat {
19			err = syscall.Lstat(path, &sys)
20		} else {
21			err = syscall.Stat(path, &sys)
22		}
23		if err != syscall.EINTR {
24			break
25		}
26	}
27	return fillStat(st, &sys, nul, err)
28}
29
30// openNul opens the file read-only. It allocates the C string of the path,
31// which stat_linux.go does not.
32func openNul(nul []byte) (rawFile, error) {
33	path := string(nul[:len(nul)-1])
34	for {
35		fd, err := syscall.Open(path, syscall.O_RDONLY|syscall.O_CLOEXEC, 0)
36		if err == syscall.EINTR {
37			continue
38		}
39		if err != nil {
40			return rawFile{}, err
41		}
42		return rawFile{fd}, nil
43	}
44}