| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build linux |
| |
| #ifndef _GNU_SOURCE // setres[ug]id() API. |
| #define _GNU_SOURCE |
| #endif |
| |
| #include <grp.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include "libcgo.h" |
| |
| /* |
| * Assumed POSIX compliant libc system call wrappers. For linux, the |
| * glibc/nptl/setxid mechanism ensures that POSIX semantics are |
| * honored for all pthreads (by default), and this in turn with cgo |
| * ensures that all Go threads launched with cgo are kept in sync for |
| * these function calls. |
| */ |
| |
| // argset_t matches runtime/cgocall.go:argset. |
| typedef struct { |
| uintptr_t* args; |
| uintptr_t retval; |
| } argset_t; |
| |
| // libc backed posix-compliant syscalls. |
| |
| #define SET_RETVAL(fn) \ |
| uintptr_t ret = (uintptr_t) fn ; \ |
| if (ret == -1) { \ |
| x->retval = (uintptr_t) errno; \ |
| } else \ |
| x->retval = ret |
| |
| void |
| _cgo_libc_setegid(argset_t* x) { |
| SET_RETVAL(setegid((gid_t) x->args[0])); |
| } |
| |
| void |
| _cgo_libc_seteuid(argset_t* x) { |
| SET_RETVAL(seteuid((uid_t) x->args[0])); |
| } |
| |
| void |
| _cgo_libc_setgid(argset_t* x) { |
| SET_RETVAL(setgid((gid_t) x->args[0])); |
| } |
| |
| void |
| _cgo_libc_setgroups(argset_t* x) { |
| SET_RETVAL(setgroups((size_t) x->args[0], (const gid_t *) x->args[1])); |
| } |
| |
| void |
| _cgo_libc_setregid(argset_t* x) { |
| SET_RETVAL(setregid((gid_t) x->args[0], (gid_t) x->args[1])); |
| } |
| |
| void |
| _cgo_libc_setresgid(argset_t* x) { |
| SET_RETVAL(setresgid((gid_t) x->args[0], (gid_t) x->args[1], |
| (gid_t) x->args[2])); |
| } |
| |
| void |
| _cgo_libc_setresuid(argset_t* x) { |
| SET_RETVAL(setresuid((uid_t) x->args[0], (uid_t) x->args[1], |
| (uid_t) x->args[2])); |
| } |
| |
| void |
| _cgo_libc_setreuid(argset_t* x) { |
| SET_RETVAL(setreuid((uid_t) x->args[0], (uid_t) x->args[1])); |
| } |
| |
| void |
| _cgo_libc_setuid(argset_t* x) { |
| SET_RETVAL(setuid((uid_t) x->args[0])); |
| } |