linux: Use long time_t __getitimer/__setitimer

The Linux kernel expects itimerval to use a 32-bit time_t, even on archs
with a 64-bit time_t (like RV32). To address this let's convert
itimerval to/from 32-bit and 64-bit to ensure the kernel always gets
a 32-bit time_t.

While we are converting these functions let's also convert them to be
the y2038 safe versions. This means there is a *64 function that is
called by a backwards compatible wrapper.

Tested-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/getitimer.c b/sysdeps/unix/sysv/linux/getitimer.c
new file mode 100644
index 0000000000..cb894a5516
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/getitimer.c
@@ -0,0 +1,61 @@
+/* getitimer -- Get the state of an interval timer.  Linux/32 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sysdep.h>
+#include <tv32-compat.h>
+
+int
+__getitimer64 (__itimer_which_t which, struct __itimerval64 *curr_value)
+{
+#if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
+  return INLINE_SYSCALL_CALL (getitimer, which, curr_value);
+#else
+  struct __itimerval32 curr_value_32;
+
+  if (INLINE_SYSCALL_CALL (getitimer, which, &curr_value_32) == -1)
+    return -1;
+
+  curr_value->it_interval
+    = valid_timeval32_to_timeval64 (curr_value_32.it_interval);
+  curr_value->it_value
+    = valid_timeval32_to_timeval64 (curr_value_32.it_value);
+  return 0;
+#endif
+}
+
+#if __TIMESIZE != 64
+libc_hidden_def (__getitimer64)
+int
+__getitimer (__itimer_which_t which, struct itimerval *curr_value)
+{
+  struct __itimerval64 val64;
+  if (__getitimer64 (which, &val64) != 0)
+    return -1;
+
+  curr_value->it_interval
+    = valid_timeval64_to_timeval (val64.it_interval);
+  curr_value->it_value
+    = valid_timeval64_to_timeval (val64.it_value);
+
+  return 0;
+}
+#endif
+weak_alias (__getitimer, getitimer)