x/sys/unix: add Getsid on linux

Fixes golang/go#17872

Change-Id: I4bfe7b47c36c3d2f0c08a2adeba595231e507b81
Reviewed-on: https://go-review.googlesource.com/33050Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

unix/syscall_linux.go

@@ -899,6 +899,7 @@ func Getpgrp() (pid int) {
 //sysnb	Getppid() (ppid int)
 //sys	Getpriority(which int, who int) (prio int, err error)
 //sysnb	Getrusage(who int, rusage *Rusage) (err error)
+//sysnb	Getsid(pid int) (sid int, err error)
 //sysnb	Gettid() (tid int)
 //sys	Getxattr(path string, attr string, dest []byte) (sz int, err error)
 //sys	InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error)

unix/zsyscall_linux_386.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_amd64.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_arm.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_arm64.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_mips64.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_mips64le.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_ppc64.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_ppc64le.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_s390x.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)

unix/zsyscall_linux_sparc64.go

@@ -572,6 +572,17 @@ func Getrusage(who int, rusage *Rusage) (err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func Getsid(pid int) (sid int, err error) {
+	r0, _, e1 := RawSyscall(SYS_GETSID, uintptr(pid), 0, 0)
+	sid = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func Gettid() (tid int) {
 	r0, _, _ := RawSyscall(SYS_GETTID, 0, 0, 0)
 	tid = int(r0)