unix: add new setfsuid/setfsgid wrappers

Added SetfsgidRetGid and SetfsuidRetUid wrappers for corresponding syscalls, both returning previous gid or uid set. Fixes golang/go#36649 Change-Id: I95176f4442258ca68db79cf967fbf0bbf0a57acf Reviewed-on: https://go-review.googlesource.com/c/sys/+/215579 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2026-02-08 03:36:03 +03:00 · 2020-01-21 14:12:35 +03:00
parent 34d275377b
commit e047566fdf
24 changed files with 122 additions and 72 deletions
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -1654,6 +1654,30 @@ func Setgid(uid int) (err error) {
 	return EOPNOTSUPP
 }

+// SetfsgidRetGid sets fsgid for current thread and returns previous fsgid set.
+// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability.
+// If the call fails due to other reasons, current fsgid will be returned.
+func SetfsgidRetGid(gid int) (int, error) {
+	return setfsgid(gid)
+}
+
+// SetfsuidRetUid sets fsuid for current thread and returns previous fsuid set.
+// setfsgid(2) will return a non-nil error only if its caller lacks CAP_SETUID capability
+// If the call fails due to other reasons, current fsuid will be returned.
+func SetfsuidRetUid(uid int) (int, error) {
+	return setfsuid(uid)
+}
+
+func Setfsgid(gid int) error {
+	_, err := setfsgid(gid)
+	return err
+}
+
+func Setfsuid(uid int) error {
+	_, err := setfsuid(uid)
+	return err
+}
+
 func Signalfd(fd int, sigmask *Sigset_t, flags int) (newfd int, err error) {
 	return signalfd(fd, sigmask, _C__NSIG/8, flags)
 }
--- a/unix/syscall_linux_386.go
+++ b/unix/syscall_linux_386.go
@@ -70,8 +70,8 @@ func Pipe2(p []int, flags int) (err error) {
 //sys	Pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
-//sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
-//sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
+//sys	setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32
+//sys	setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32
 //sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
--- a/unix/syscall_linux_amd64.go
+++ b/unix/syscall_linux_amd64.go
@@ -55,8 +55,8 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err
 }

 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_arm.go
+++ b/unix/syscall_linux_arm.go
@@ -98,8 +98,8 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
-//sys	Setfsgid(gid int) (err error) = SYS_SETFSGID32
-//sys	Setfsuid(uid int) (err error) = SYS_SETFSUID32
+//sys	setfsgid(gid int) (prev int, err error) = SYS_SETFSGID32
+//sys	setfsuid(uid int) (prev int, err error) = SYS_SETFSUID32
 //sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID32
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error) = SYS_SETRESGID32
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error) = SYS_SETRESUID32
--- a/unix/syscall_linux_arm64.go
+++ b/unix/syscall_linux_arm64.go
@@ -42,8 +42,8 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err
 }

 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_mips64x.go
+++ b/unix/syscall_linux_mips64x.go
@@ -36,8 +36,8 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err
 }

 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_mipsx.go
+++ b/unix/syscall_linux_mipsx.go
@@ -31,8 +31,8 @@ func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr,
 //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_ppc64x.go
+++ b/unix/syscall_linux_ppc64x.go
@@ -34,8 +34,8 @@ package unix
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_riscv64.go
+++ b/unix/syscall_linux_riscv64.go
@@ -41,8 +41,8 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err
 }

 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_s390x.go
+++ b/unix/syscall_linux_s390x.go
@@ -34,8 +34,8 @@ import (
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/syscall_linux_sparc64.go
+++ b/unix/syscall_linux_sparc64.go
@@ -30,8 +30,8 @@ package unix
 //sys	Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
 //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
 //sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error)
-//sys	Setfsgid(gid int) (err error)
-//sys	Setfsuid(uid int) (err error)
+//sys	setfsgid(gid int) (prev int, err error)
+//sys	setfsuid(uid int) (prev int, err error)
 //sysnb	Setregid(rgid int, egid int) (err error)
 //sysnb	Setresgid(rgid int, egid int, sgid int) (err error)
 //sysnb	Setresuid(ruid int, euid int, suid int) (err error)
--- a/unix/zsyscall_linux_386.go
+++ b/unix/zsyscall_linux_386.go
@@ -2121,8 +2121,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID32, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID32, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2131,8 +2132,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID32, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID32, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_amd64.go
+++ b/unix/zsyscall_linux_amd64.go
@@ -2137,8 +2137,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2147,8 +2148,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_arm.go
+++ b/unix/zsyscall_linux_arm.go
@@ -2257,8 +2257,9 @@ func Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID32, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID32, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2267,8 +2268,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID32, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID32, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_arm64.go
+++ b/unix/zsyscall_linux_arm64.go
@@ -2060,8 +2060,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2070,8 +2071,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_mips.go
+++ b/unix/zsyscall_linux_mips.go
@@ -2051,8 +2051,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2061,8 +2062,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_mips64.go
+++ b/unix/zsyscall_linux_mips64.go
@@ -2081,8 +2081,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2091,8 +2092,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_mips64le.go
+++ b/unix/zsyscall_linux_mips64le.go
@@ -2081,8 +2081,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2091,8 +2092,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_mipsle.go
+++ b/unix/zsyscall_linux_mipsle.go
@@ -2051,8 +2051,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2061,8 +2062,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_ppc64.go
+++ b/unix/zsyscall_linux_ppc64.go
@@ -2163,8 +2163,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2173,8 +2174,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_ppc64le.go
+++ b/unix/zsyscall_linux_ppc64le.go
@@ -2163,8 +2163,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2173,8 +2174,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_riscv64.go
+++ b/unix/zsyscall_linux_riscv64.go
@@ -2040,8 +2040,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2050,8 +2051,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_s390x.go
+++ b/unix/zsyscall_linux_s390x.go
@@ -2133,8 +2133,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2143,8 +2144,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
--- a/unix/zsyscall_linux_sparc64.go
+++ b/unix/zsyscall_linux_sparc64.go
@@ -2132,8 +2132,9 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsgid(gid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+func setfsgid(gid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSGID, uintptr(gid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}
@@ -2142,8 +2143,9 @@ func Setfsgid(gid int) (err error) {

 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

-func Setfsuid(uid int) (err error) {
-	_, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+func setfsuid(uid int) (prev int, err error) {
+	r0, _, e1 := Syscall(SYS_SETFSUID, uintptr(uid), 0, 0)
+	prev = int(r0)
 	if e1 != 0 {
 		err = errnoErr(e1)
 	}