qemu/bsd-user/freebsd/os-proc.h
Stacey Son 6756ae283a bsd-user: Implement pdfork(2) system call.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20230925182425.3163-29-kariem.taha2.7@gmail.com>
2023-10-03 17:14:06 -06:00

294 lines
7.3 KiB
C

/*
* process related system call shims and definitions
*
* Copyright (c) 2013-14 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef BSD_USER_FREEBSD_OS_PROC_H
#define BSD_USER_FREEBSD_OS_PROC_H
#include <sys/param.h>
#include <sys/procctl.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <sys/procdesc.h>
#include <sys/wait.h>
#include <unistd.h>
#include "target_arch_cpu.h"
pid_t safe_wait4(pid_t wpid, int *status, int options, struct rusage *rusage);
pid_t safe_wait6(idtype_t idtype, id_t id, int *status, int options,
struct __wrusage *wrusage, siginfo_t *infop);
extern int __setugid(int flag);
/* execve(2) */
static inline abi_long do_freebsd_execve(abi_ulong path_or_fd, abi_ulong argp,
abi_ulong envp)
{
return freebsd_exec_common(path_or_fd, argp, envp, 0);
}
/* fexecve(2) */
static inline abi_long do_freebsd_fexecve(abi_ulong path_or_fd, abi_ulong argp,
abi_ulong envp)
{
return freebsd_exec_common(path_or_fd, argp, envp, 1);
}
/* wait4(2) */
static inline abi_long do_freebsd_wait4(abi_long arg1, abi_ulong target_status,
abi_long arg3, abi_ulong target_rusage)
{
abi_long ret;
int status;
struct rusage rusage, *rusage_ptr = NULL;
if (target_rusage) {
rusage_ptr = &rusage;
}
ret = get_errno(safe_wait4(arg1, &status, arg3, rusage_ptr));
if (ret < 0) {
return ret;
}
if (target_status != 0) {
status = host_to_target_waitstatus(status);
if (put_user_s32(status, target_status) != 0) {
return -TARGET_EFAULT;
}
}
if (target_rusage != 0) {
host_to_target_rusage(target_rusage, &rusage);
}
return ret;
}
/* wait6(2) */
static inline abi_long do_freebsd_wait6(void *cpu_env, abi_long idtype,
abi_long id1, abi_long id2,
abi_ulong target_status, abi_long options, abi_ulong target_wrusage,
abi_ulong target_infop, abi_ulong pad1)
{
abi_long ret;
int status;
struct __wrusage wrusage, *wrusage_ptr = NULL;
siginfo_t info;
void *p;
if (regpairs_aligned(cpu_env) != 0) {
/* printf("shifting args\n"); */
/* 64-bit id is aligned, so shift all the arguments over by one */
id1 = id2;
id2 = target_status;
target_status = options;
options = target_wrusage;
target_wrusage = target_infop;
target_infop = pad1;
}
if (target_wrusage) {
wrusage_ptr = &wrusage;
}
ret = get_errno(safe_wait6(idtype, target_arg64(id1, id2),
&status, options, wrusage_ptr, &info));
if (ret < 0) {
return ret;
}
if (target_status != 0) {
status = host_to_target_waitstatus(status);
if (put_user_s32(status, target_status) != 0) {
return -TARGET_EFAULT;
}
}
if (target_wrusage != 0) {
host_to_target_wrusage(target_wrusage, &wrusage);
}
if (target_infop != 0) {
p = lock_user(VERIFY_WRITE, target_infop, sizeof(target_siginfo_t), 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
host_to_target_siginfo(p, &info);
unlock_user(p, target_infop, sizeof(target_siginfo_t));
}
return ret;
}
/* setloginclass(2) */
static inline abi_long do_freebsd_setloginclass(abi_ulong arg1)
{
abi_long ret;
void *p;
p = lock_user_string(arg1);
if (p == NULL) {
return -TARGET_EFAULT;
}
ret = get_errno(setloginclass(p));
unlock_user(p, arg1, 0);
return ret;
}
/* getloginclass(2) */
static inline abi_long do_freebsd_getloginclass(abi_ulong arg1, abi_ulong arg2)
{
abi_long ret;
void *p;
p = lock_user(VERIFY_WRITE, arg1, arg2, 0);
if (p == NULL) {
return -TARGET_EFAULT;
}
ret = get_errno(getloginclass(p, arg2));
unlock_user(p, arg1, arg2);
return ret;
}
/* pdgetpid(2) */
static inline abi_long do_freebsd_pdgetpid(abi_long fd, abi_ulong target_pidp)
{
abi_long ret;
pid_t pid;
ret = get_errno(pdgetpid(fd, &pid));
if (!is_error(ret)) {
if (put_user_u32(pid, target_pidp)) {
return -TARGET_EFAULT;
}
}
return ret;
}
/* undocumented __setugid */
static inline abi_long do_freebsd___setugid(abi_long arg1)
{
return -TARGET_ENOSYS;
}
/* fork(2) */
static inline abi_long do_freebsd_fork(void *cpu_env)
{
abi_long ret;
abi_ulong child_flag;
fork_start();
ret = fork();
if (ret == 0) {
/* child */
child_flag = 1;
target_cpu_clone_regs(cpu_env, 0);
} else {
/* parent */
child_flag = 0;
}
/*
* The fork system call sets a child flag in the second return
* value: 0 for parent process, 1 for child process.
*/
set_second_rval(cpu_env, child_flag);
fork_end(child_flag);
return ret;
}
/* vfork(2) */
static inline abi_long do_freebsd_vfork(void *cpu_env)
{
return do_freebsd_fork(cpu_env);
}
/* rfork(2) */
static inline abi_long do_freebsd_rfork(void *cpu_env, abi_long flags)
{
abi_long ret;
abi_ulong child_flag;
/*
* XXX We need to handle RFMEM here, as well. Neither are safe to execute
* as-is on x86 hosts because they'll split memory but not the stack,
* wreaking havoc on host architectures that use the stack to store the
* return address as both threads try to pop it off. Rejecting RFSPAWN
* entirely for now is ok, the only consumer at the moment is posix_spawn
* and it will fall back to classic vfork(2) if we return EINVAL.
*/
if ((flags & TARGET_RFSPAWN) != 0) {
return -TARGET_EINVAL;
}
fork_start();
ret = rfork(flags);
if (ret == 0) {
/* child */
child_flag = 1;
target_cpu_clone_regs(cpu_env, 0);
} else {
/* parent */
child_flag = 0;
}
/*
* The fork system call sets a child flag in the second return
* value: 0 for parent process, 1 for child process.
*/
set_second_rval(cpu_env, child_flag);
fork_end(child_flag);
return ret;
}
/* pdfork(2) */
static inline abi_long do_freebsd_pdfork(void *cpu_env, abi_ulong target_fdp,
abi_long flags)
{
abi_long ret;
abi_ulong child_flag;
int fd;
fork_start();
ret = pdfork(&fd, flags);
if (ret == 0) {
/* child */
child_flag = 1;
target_cpu_clone_regs(cpu_env, 0);
} else {
/* parent */
child_flag = 0;
if (put_user_s32(fd, target_fdp)) {
return -TARGET_EFAULT;
}
}
/*
* The fork system call sets a child flag in the second return
* value: 0 for parent process, 1 for child process.
*/
set_second_rval(cpu_env, child_flag);
fork_end(child_flag);
return ret;
}
#endif /* BSD_USER_FREEBSD_OS_PROC_H */