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// 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.
//go: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 == (uintptr_t) -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]));
}