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Kernel/LibC: add clock_gettime() for CLOCK_MONOTONIC

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This gets the number of milliseconds since boot
This commit is contained in:
Bananymous
2023-07-06 00:38:29 +03:00
parent 4086d7c3be
commit 1fb305fa45
7 changed files with 40 additions and 0 deletions
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2
kernel/include/kernel/Process.h
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@@ -99,6 +99,8 @@ namespace Kernel
BAN::ErrorOr<long> sys_termid(char*) const;
BAN::ErrorOr<long> sys_clock_gettime(clockid_t, timespec*) const;
TTY& tty() { ASSERT(m_tty); return *m_tty; }
static Process& current() { return Thread::current().process(); }

18
kernel/kernel/Process.cpp
View File

@@ -835,6 +835,24 @@ namespace Kernel
return 0;
}
BAN::ErrorOr<long> Process::sys_clock_gettime(clockid_t clock_id, timespec* tp) const
{
switch (clock_id)
{
case CLOCK_MONOTONIC:
{
uint64_t time_ms = PIT::ms_since_boot();
tp->tv_sec = time_ms / 1000;
tp->tv_nsec = (time_ms % 1000) * 1000000;
break;
}
default:
return BAN::Error::from_errno(ENOTSUP);
}
return 0;
}
BAN::ErrorOr<long> Process::sys_setuid(uid_t uid)
{
if (uid < 0 || uid >= 1'000'000'000)

3
kernel/kernel/Syscall.cpp
View File

@@ -129,6 +129,9 @@ namespace Kernel
case SYS_SET_PWD:
ret = Process::current().sys_setpwd((const char*)arg1);
break;
case SYS_CLOCK_GETTIME:
ret = Process::current().sys_clock_gettime((clockid_t)arg1, (timespec*)arg2);
break;
default:
dwarnln("Unknown syscall {}", syscall);
break;