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[sys/linux]: Add clone syscall and use it in fork for arm64

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This commit is contained in:
PucklaJ
2024-04-24 15:32:43 +02:00
parent 2bf00d9b3f
commit a2ad66cd9d
1 changed files with 19 additions and 5 deletions
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core/sys/linux/sys.odin
+19 -5
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@@ -729,7 +729,22 @@ getsockopt :: proc {
getsockopt_base,
}
// TODO(flysand): clone (probably not in this PR, maybe not ever)
/*
Creates a new ("child") process, in a manner similar to fork.
Available since Linux 1.0? (<2.4)
Note(flysand): this syscall is not documented, but the bottom 8 bits of flags
are for exit signal
*/
clone :: proc "contextless" (flags: u64, stack: rawptr, parent_tid, child_tid: ^i32, tls: u64) -> (i64, Errno) {
when ODIN_ARCH == .amd64 {
ret := syscall(SYS_clone, flags, stack, parent_tid, child_tid, tls)
return errno_unwrap(ret, i64)
} else {
ret := syscall(SYS_clone, flags, stack, parent_tid, tls, child_tid)
return errno_unwrap(ret, i64)
}
}
/*
Creates a copy of the running process.
@@ -737,10 +752,9 @@ getsockopt :: proc {
*/
fork :: proc "contextless" () -> (Pid, Errno) {
when ODIN_ARCH == .arm64 {
// Note(flysand): this syscall is not documented, but the bottom 8 bits of flags
// are for exit signal
ret := syscall(SYS_clone, Signal.SIGCHLD)
return errno_unwrap(ret, Pid)
ret, err := clone(u64(Signal.SIGCHLD), nil, nil, nil, 0)
if err != .NONE do return Pid(ret), err
return Pid(ret), .NONE
} else {
ret := syscall(SYS_fork)
return errno_unwrap(ret, Pid)