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Add vfork syscall and related clone flags

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This commit is contained in:
le-monde-bleu 2025-02-19 17:06:05 +08:00 committed by Jianfeng Jiang
parent 9a974a0483
commit 43e43ca133
3 changed files with 18 additions and 2 deletions
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11
kernel/src/process/clone.rs
View File

@ -137,6 +137,14 @@ impl CloneArgs {
..Default::default()
}
}
pub fn for_vfork() -> Self {
Self {
flags: CloneFlags::CLONE_VFORK | CloneFlags::CLONE_VM,
exit_signal: Some(SIGCHLD),
..Default::default()
}
}
}
impl From<u64> for CloneFlags {
@ -158,7 +166,8 @@ impl CloneFlags {
| CloneFlags::CLONE_SETTLS
| CloneFlags::CLONE_PARENT_SETTID
| CloneFlags::CLONE_CHILD_SETTID
| CloneFlags::CLONE_CHILD_CLEARTID;
| CloneFlags::CLONE_CHILD_CLEARTID
| CloneFlags::CLONE_VFORK;
let unsupported_flags = *self - supported_flags;
if !unsupported_flags.is_empty() {
warn!("contains unsupported clone flags: {:?}", unsupported_flags);

3
kernel/src/syscall/arch/x86.rs
View File

@ -26,7 +26,7 @@ use crate::syscall::{
fallocate::sys_fallocate,
fcntl::sys_fcntl,
flock::sys_flock,
fork::sys_fork,
fork::{sys_fork, sys_vfork},
fsync::{sys_fdatasync, sys_fsync},
futex::sys_futex,
get_priority::sys_get_priority,
@ -205,6 +205,7 @@ impl_syscall_nums_and_dispatch_fn! {
SYS_GETSOCKOPT = 55 => sys_getsockopt(args[..5]);
SYS_CLONE = 56 => sys_clone(args[..5], &user_ctx);
SYS_FORK = 57 => sys_fork(args[..0], &user_ctx);
SYS_VFORK = 58 => sys_vfork(args[..0], &user_ctx);
SYS_EXECVE = 59 => sys_execve(args[..3], &mut user_ctx);
SYS_EXIT = 60 => sys_exit(args[..1]);
SYS_WAIT4 = 61 => sys_wait4(args[..4]);

6
kernel/src/syscall/fork.rs
View File

@ -13,3 +13,9 @@ pub fn sys_fork(ctx: &Context, parent_context: &UserContext) -> Result<SyscallRe
let child_pid = clone_child(ctx, parent_context, clone_args).unwrap();
Ok(SyscallReturn::Return(child_pid as _))
}
pub fn sys_vfork(ctx: &Context, parent_context: &UserContext) -> Result<SyscallReturn> {
let clone_args = CloneArgs::for_vfork();
let child_pid = clone_child(ctx, parent_context, clone_args).unwrap();
Ok(SyscallReturn::Return(child_pid as _))
}