Merge pull request #155 from arihant2math/timeofday

Proper timeofday implementations

src/arch/arm64/exceptions/syscall.rs

@@ -1,6 +1,9 @@
 use crate::{
     arch::{Arch, ArchImpl},
-    clock::{gettime::sys_clock_gettime, timeofday::sys_gettimeofday},
+    clock::{
+        gettime::sys_clock_gettime,
+        timeofday::{sys_gettimeofday, sys_settimeofday},
+    },
     fs::{
         dir::sys_getdents64,
         pipe::sys_pipe2,
@@ -473,6 +476,7 @@ pub async fn handle_syscall() {
         0xa6 => sys_umask(arg1 as _).map_err(|e| match e {}),
         0xa7 => sys_prctl(arg1 as _, arg2, arg3).await,
         0xa9 => sys_gettimeofday(TUA::from_value(arg1 as _), TUA::from_value(arg2 as _)).await,
+        0xaa => sys_settimeofday(TUA::from_value(arg1 as _), TUA::from_value(arg2 as _)).await,
         0xac => sys_getpid().map_err(|e| match e {}),
         0xad => sys_getppid().map_err(|e| match e {}),
         0xae => sys_getuid().map_err(|e| match e {}),

src/clock/realtime.rs

@@ -18,5 +18,12 @@ pub fn date() -> Duration {
     }
 }
 
+pub fn set_date(duration: Duration) {
+    if let Some(now) = now() {
+        let mut epoch_info = EPOCH_DURATION.lock_save_irq();
+        *epoch_info = Some((duration, now));
+    }
+}
+
 // Represents a known duration since the epoch at the assoicated instant.
 static EPOCH_DURATION: SpinLock<Option<(Duration, Instant)>> = SpinLock::new(None);

src/clock/timeofday.rs

@@ -1,5 +1,6 @@
 use super::timespec::TimeSpec;
-use crate::memory::uaccess::{UserCopyable, copy_to_user};
+use crate::clock::realtime::{date, set_date};
+use crate::memory::uaccess::{UserCopyable, copy_from_user, copy_to_user};
 use core::time::Duration;
 use libkernel::{error::Result, memory::address::TUA};
 
@@ -12,7 +13,7 @@ pub struct TimeZone {
 unsafe impl UserCopyable for TimeZone {}
 
 pub async fn sys_gettimeofday(tv: TUA<TimeSpec>, tz: TUA<TimeZone>) -> Result<usize> {
-    let time: TimeSpec = Duration::new(0, 0).into();
+    let time: TimeSpec = date().into();
 
     copy_to_user(tv, time).await?;
 
@@ -29,3 +30,10 @@ pub async fn sys_gettimeofday(tv: TUA<TimeSpec>, tz: TUA<TimeZone>) -> Result<us
 
     Ok(0)
 }
+
+pub async fn sys_settimeofday(tv: TUA<TimeSpec>, _tz: TUA<TimeZone>) -> Result<usize> {
+    let time: TimeSpec = copy_from_user(tv).await?;
+    let duration: Duration = time.into();
+    set_date(duration);
+    Ok(0)
+}