unix: add PidfdOpen and PidfdGetfd Add wrappers for the pidfd_open and pidfd_getfd sycalls, available since 5.3. PIDFD_NONBLOCK is defined manually since mkerrors.sh doesn't handle including linux/pidfd.h well. See https://man7.org/linux/man-pages/man2/pidfd_open.2.html Change-Id: I68dfb52f6a7a44b7f3324a8379860a1bb765e71b Reviewed-on: https://go-review.googlesource.com/c/sys/+/347332 Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org>

diff --git a/unix/linux/types.go b/unix/linux/types.go
index 7d76e5c..515e3b6 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go

@@ -3829,3 +3829,9 @@
 const (
 	LANDLOCK_RULE_PATH_BENEATH = C.LANDLOCK_RULE_PATH_BENEATH
 )
+
+// pidfd flags.
+
+const (
+	PIDFD_NONBLOCK = C.O_NONBLOCK
+)

diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index df8628e..b90214d 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go

@@ -2288,6 +2288,9 @@
 //sys	ProcessVMReadv(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_READV
 //sys	ProcessVMWritev(pid int, localIov []Iovec, remoteIov []RemoteIovec, flags uint) (n int, err error) = SYS_PROCESS_VM_WRITEV
 
+//sys	PidfdOpen(pid int, flags int) (fd int, err error) = SYS_PIDFD_OPEN
+//sys	PidfdGetfd(pidfd int, targetfd int, flags int) (fd int, err error) = SYS_PIDFD_GETFD
+
 /*
  * Unimplemented
  */

diff --git a/unix/zsyscall_linux.go b/unix/zsyscall_linux.go
index 2dbe3da..f98d2e3 100644
--- a/unix/zsyscall_linux.go
+++ b/unix/zsyscall_linux.go

@@ -1945,6 +1945,28 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func PidfdOpen(pid int, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_PIDFD_OPEN, uintptr(pid), uintptr(flags), 0)
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func PidfdGetfd(pidfd int, targetfd int, flags int) (fd int, err error) {
+	r0, _, e1 := Syscall(SYS_PIDFD_GETFD, uintptr(pidfd), uintptr(targetfd), uintptr(flags))
+	fd = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func pipe2(p *[2]_C_int, flags int) (err error) {
 	_, _, e1 := RawSyscall(SYS_PIPE2, uintptr(unsafe.Pointer(p)), uintptr(flags), 0)
 	if e1 != 0 {

diff --git a/unix/ztypes_linux_386.go b/unix/ztypes_linux_386.go
index 72f2e96..3219ade 100644
--- a/unix/ztypes_linux_386.go
+++ b/unix/ztypes_linux_386.go

@@ -635,3 +635,7 @@
 	PPS_GETCAP    = 0x800470a3
 	PPS_FETCH     = 0xc00470a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_amd64.go b/unix/ztypes_linux_amd64.go
index d5f018d..16acd3b 100644
--- a/unix/ztypes_linux_amd64.go
+++ b/unix/ztypes_linux_amd64.go

@@ -653,3 +653,7 @@
 	PPS_GETCAP    = 0x800870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_arm.go b/unix/ztypes_linux_arm.go
index 675446d..c4982a2 100644
--- a/unix/ztypes_linux_arm.go
+++ b/unix/ztypes_linux_arm.go

@@ -630,3 +630,7 @@
 	PPS_GETCAP    = 0x800470a3
 	PPS_FETCH     = 0xc00470a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_arm64.go b/unix/ztypes_linux_arm64.go
index 711d071..98bb8a4 100644
--- a/unix/ztypes_linux_arm64.go
+++ b/unix/ztypes_linux_arm64.go

@@ -632,3 +632,7 @@
 	PPS_GETCAP    = 0x800870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_mips.go b/unix/ztypes_linux_mips.go
index c1131c7..d5bfc35 100644
--- a/unix/ztypes_linux_mips.go
+++ b/unix/ztypes_linux_mips.go

@@ -636,3 +636,7 @@
 	PPS_GETCAP    = 0x400470a3
 	PPS_FETCH     = 0xc00470a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x80
+)

diff --git a/unix/ztypes_linux_mips64.go b/unix/ztypes_linux_mips64.go
index 91d5574..b52c568 100644
--- a/unix/ztypes_linux_mips64.go
+++ b/unix/ztypes_linux_mips64.go

@@ -635,3 +635,7 @@
 	PPS_GETCAP    = 0x400870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x80
+)

diff --git a/unix/ztypes_linux_mips64le.go b/unix/ztypes_linux_mips64le.go
index 5d72149..a340b84 100644
--- a/unix/ztypes_linux_mips64le.go
+++ b/unix/ztypes_linux_mips64le.go

@@ -635,3 +635,7 @@
 	PPS_GETCAP    = 0x400870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x80
+)

diff --git a/unix/ztypes_linux_mipsle.go b/unix/ztypes_linux_mipsle.go
index a5addd0..b43d8e2 100644
--- a/unix/ztypes_linux_mipsle.go
+++ b/unix/ztypes_linux_mipsle.go

@@ -636,3 +636,7 @@
 	PPS_GETCAP    = 0x400470a3
 	PPS_FETCH     = 0xc00470a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x80
+)

diff --git a/unix/ztypes_linux_ppc.go b/unix/ztypes_linux_ppc.go
index bb6b03d..efd7313 100644
--- a/unix/ztypes_linux_ppc.go
+++ b/unix/ztypes_linux_ppc.go

@@ -642,3 +642,7 @@
 	PPS_GETCAP    = 0x400470a3
 	PPS_FETCH     = 0xc00470a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_ppc64.go b/unix/ztypes_linux_ppc64.go
index 7637243..22cedda 100644
--- a/unix/ztypes_linux_ppc64.go
+++ b/unix/ztypes_linux_ppc64.go

@@ -642,3 +642,7 @@
 	PPS_GETCAP    = 0x400870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_ppc64le.go b/unix/ztypes_linux_ppc64le.go
index a1a28e5..452a76d 100644
--- a/unix/ztypes_linux_ppc64le.go
+++ b/unix/ztypes_linux_ppc64le.go

@@ -642,3 +642,7 @@
 	PPS_GETCAP    = 0x400870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_riscv64.go b/unix/ztypes_linux_riscv64.go
index e0a8a13..96c667d 100644
--- a/unix/ztypes_linux_riscv64.go
+++ b/unix/ztypes_linux_riscv64.go

@@ -660,3 +660,7 @@
 	PPS_GETCAP    = 0x800870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_s390x.go b/unix/ztypes_linux_s390x.go
index 21d6e56..af04ee1 100644
--- a/unix/ztypes_linux_s390x.go
+++ b/unix/ztypes_linux_s390x.go

@@ -656,3 +656,7 @@
 	PPS_GETCAP    = 0x800870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x800
+)

diff --git a/unix/ztypes_linux_sparc64.go b/unix/ztypes_linux_sparc64.go
index 0531e98..6f385cf 100644
--- a/unix/ztypes_linux_sparc64.go
+++ b/unix/ztypes_linux_sparc64.go

@@ -637,3 +637,7 @@
 	PPS_GETCAP    = 0x400870a3
 	PPS_FETCH     = 0xc00870a4
 )
+
+const (
+	PIDFD_NONBLOCK = 0x4000
+)