[newlib-cygwin] nvptx: Provide stub 'getpid', 'kill', 'stat'

[Thomas Schwinge <tschwinge@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=29b137af8098fa63b824072e1ce33883275959a3

commit 29b137af8098fa63b824072e1ce33883275959a3
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Wed Sep 21 18:58:34 2022 +0200

    nvptx: Provide stub 'getpid', 'kill', 'stat'
    
    ... as implemented for GCN in 'newlib/libc/sys/amdgcn/*' files, but (for now)
    still adding to the catch-all 'newlib/libc/machine/nvptx/misc.c' file.
    
    This is necessary for the GCC/Fortran I/O system, for example.
    
    Co-authored-by: Andrew Stubbs <ams@codesourcery.com>

Diff:
---
 newlib/libc/machine/nvptx/misc.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/newlib/libc/machine/nvptx/misc.c b/newlib/libc/machine/nvptx/misc.c
index 897ddc807..56e66b9f3 100644
--- a/newlib/libc/machine/nvptx/misc.c
+++ b/newlib/libc/machine/nvptx/misc.c
@@ -36,11 +36,22 @@ gettimeofday (struct timeval *tv, void *tz) {
   return -1;
 }
 
+int
+getpid (void) {
+  return 0;
+}
+
 int
 isatty (int fd) {
   return fd == 1;
 }
 
+int
+kill (int pid, int sig) {
+  errno = ESRCH;
+  return -1;
+}
+
 off_t
 lseek(int fd, off_t offset, int whence) {
   return 0;
@@ -56,6 +67,12 @@ read(int fd, void *buf, size_t count) {
   return 0;
 }
 
+int
+stat (const char *file, struct stat *pstat) {
+  errno = EACCES;
+  return -1;
+}
+
 void
 sync (void) {
 }