unix: add PthreadChdir and PthreadFchdir on darwin

Fixes golang/go#68226

Change-Id: I92052e2319e4edde21b5e1e47ddb5b261d81448a
GitHub-Last-Rev: bc02d6d
GitHub-Pull-Request: #201
Reviewed-on: https://go-review.googlesource.com/c/sys/+/595677
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Author: espadolini

unix/darwin_amd64_test.go

@@ -542,6 +542,18 @@ func SysctlKinfoProcSlice(name string, args ...int) ([]KinfoProc, error) {
 	}
 }
 
+//sys	pthread_chdir_np(path string) (err error)
+
+func PthreadChdir(path string) (err error) {
+	return pthread_chdir_np(path)
+}
+
+//sys	pthread_fchdir_np(fd int) (err error)
+
+func PthreadFchdir(fd int) (err error) {
+	return pthread_fchdir_np(fd)
+}
+
 //sys	sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error)
 
 //sys	shmat(id int, addr uintptr, flag int) (ret uintptr, err error)

unix/darwin_arm64_test.go

@@ -228,6 +228,16 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_sysctl_trampoline_addr(SB), RODATA, $8
 DATA	·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)
 
+TEXT libc_pthread_chdir_np_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_pthread_chdir_np(SB)
+GLOBL	·libc_pthread_chdir_np_trampoline_addr(SB), RODATA, $8
+DATA	·libc_pthread_chdir_np_trampoline_addr(SB)/8, $libc_pthread_chdir_np_trampoline<>(SB)
+
+TEXT libc_pthread_fchdir_np_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_pthread_fchdir_np(SB)
+GLOBL	·libc_pthread_fchdir_np_trampoline_addr(SB), RODATA, $8
+DATA	·libc_pthread_fchdir_np_trampoline_addr(SB)/8, $libc_pthread_fchdir_np_trampoline<>(SB)
+
 TEXT libc_sendfile_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_sendfile(SB)
 GLOBL	·libc_sendfile_trampoline_addr(SB), RODATA, $8

unix/syscall_darwin.go

@@ -228,6 +228,16 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_sysctl_trampoline_addr(SB), RODATA, $8
 DATA	·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)
 
+TEXT libc_pthread_chdir_np_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_pthread_chdir_np(SB)
+GLOBL	·libc_pthread_chdir_np_trampoline_addr(SB), RODATA, $8
+DATA	·libc_pthread_chdir_np_trampoline_addr(SB)/8, $libc_pthread_chdir_np_trampoline<>(SB)
+
+TEXT libc_pthread_fchdir_np_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_pthread_fchdir_np(SB)
+GLOBL	·libc_pthread_fchdir_np_trampoline_addr(SB), RODATA, $8
+DATA	·libc_pthread_fchdir_np_trampoline_addr(SB)/8, $libc_pthread_fchdir_np_trampoline<>(SB)
+
 TEXT libc_sendfile_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_sendfile(SB)
 GLOBL	·libc_sendfile_trampoline_addr(SB), RODATA, $8