Misc. illumous build fixes (prereq. for #105403) (#117023)

* Fix illumos compile error at minipal/debugger.c:127

  dotnet/runtime/src/native/minipal/debugger.c:127:5: error: implicit declaration of function 'snprintf' [-Werror=implicit-function-declaration]
    127 |     snprintf(statusFilename, sizeof(statusFilename), "/proc/%d/status", getpid());
        |     ^~~~~~~~

* Fix illumos compile error in minipal/thread.h

  src/native/minipal/thread.h:73:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
     73 |         tid = (size_t)(void*)pthread_self();
        |                       ^~~~~~~~~~~~~~~~~~~~~

* Fix illumos compile error in native/libs/System.Native/pal_mount.c

 src/native/libs/System.Native/pal_mount.c:164:38: error: 'struct statvfs' has no member named 'f_type'
    164 |         *formatType = (int64_t)(stats.f_type);
        |                                      ^

* Fix illumos compile error in coreclr/pal/src/thread/thread.cpp

  /home/gwr/dotnet/runtime/src/coreclr/pal/src/thread/thread.cpp:1367:5: error: 'cid' was not declared in this scope
   1367 |     cid = CLOCK_THREAD_CPUTIME_ID;
        |     ^~~

Author: gwr

src/coreclr/pal/src/thread/thread.cpp

@@ -1330,10 +1330,9 @@ CorUnix::GetThreadTimesInternal(
     CPalThread *pThread;
     CPalThread *pTargetThread;
     IPalObject *pobjThread = NULL;
+    clockid_t cid;
 #ifdef __sun
     int fd;
-#else // __sun
-    clockid_t cid;
 #endif // __sun
 
     pThread = InternalGetCurrentThread();

src/native/libs/Common/pal_config.h.in

@@ -31,6 +31,7 @@
 #cmakedefine01 HAVE_MNTINFO
 #cmakedefine01 HAVE_STATFS_FSTYPENAME
 #cmakedefine01 HAVE_STATVFS_FSTYPENAME
+#cmakedefine01 HAVE_STATVFS_BASETYPE
 #cmakedefine01 HAVE_NON_LEGACY_STATFS
 #cmakedefine01 HAVE_STRCPY_S
 #cmakedefine01 HAVE_STRLCPY

src/native/libs/System.Native/pal_mount.c

@@ -159,6 +159,14 @@ SystemNative_GetFileSystemTypeNameForMountPoint(const char* name, char* formatNa
         }
         SafeStringCopy(formatNameBuffer, Int32ToSizeT(bufferLength), stats.f_fstypename);
         *formatType = -1;
+#elif HAVE_STATVFS_BASETYPE
+        if (bufferLength < _FSTYPSZ)        // SunOS
+        {
+            errno = ERANGE;
+            result = -1;
+        }
+        SafeStringCopy(formatNameBuffer, Int32ToSizeT(bufferLength), stats.f_basetype);
+        *formatType = -1;
 #else
         SafeStringCopy(formatNameBuffer, Int32ToSizeT(bufferLength), "");
         *formatType = (int64_t)(stats.f_type);

src/native/libs/configure.cmake

@@ -324,6 +324,12 @@ check_struct_has_member(
     "sys/mount.h"
     HAVE_STATVFS_FSTYPENAME)
 
+check_struct_has_member(
+    "struct statvfs"
+    f_basetype
+    "sys/statvfs.h"
+    HAVE_STATVFS_BASETYPE)
+
 set(CMAKE_EXTRA_INCLUDE_FILES dirent.h)
 
 # statfs: Find whether this struct exists

src/native/minipal/debugger.c

@@ -32,6 +32,7 @@
 #include <sys/proc.h>
 #define MINIPAL_DEBUGGER_PRESENT_CHECK
 #elif defined(__sun)
+#include <stdio.h>
 #include <fcntl.h>
 #include <procfs.h>
 #include <errno.h>

src/native/minipal/thread.h

@@ -69,6 +69,8 @@ static inline size_t minipal_get_current_thread_id(void)
         tid = (size_t)_lwp_self();
 #elif defined(__HAIKU__)
         tid = (size_t)find_thread(NULL);
+#elif defined(__sun)
+        tid = (size_t)pthread_self();
 #else
         tid = (size_t)(void*)pthread_self();
 #endif