Merge tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull nolibc updates from Shuah Khan:
 "Nolibc:
   - improved portability by removing build errors with -ENOSYS
   - added syscall6() on MIPS to support pselect6() and mmap()
   - added setvbuf(), rmdir(), pipe(), pipe2()
   - add support for ppc/ppc64
   - environ is no longer optional
   - fixed frame pointer issues at -O0
   - dropped sys_stat() in favor of sys_statx()
   - centralized _start_c() to remove lots of asm code
   - switched size_t to __SIZE_TYPE__

  Selftests:
   - improved status reporting (success/warning/failure counts, path to
     log file)
   - various code cleanups (indent, unused variables, ...)
   - more consistent test numbering
   - enabled compiler warnings
   - dropped unreliable chmod_net test
   - improved reliability (create /dev/zero & /tmp, rely less on /proc)
   - new tests (brk/sbrk/mmap/munmap)
   - improved compatibility with musl
   - new run-nolibc-test target to build and run natively
   - new run-libc-test target to build and run against native libc
   - made the cmdline parser more reliable against boolean arguments
   - dropped dependency on memfd for vfprintf() test
   - nolibc-test is no longer stripped
   - added support for extending ARCH via XARCH

  Other:
   - add Thomas as co-maintainer"

* tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (103 commits)
  tools/nolibc: avoid undesired casts in the __sysret() macro
  tools/nolibc: keep brk(), sbrk(), mmap() away from __sysret()
  tools/nolibc: silence ppc64 compile warnings
  selftests/nolibc: libc-test: use HOSTCC instead of CC
  tools/nolibc: stackprotector.h: make __stack_chk_init static
  selftests/nolibc: allow report with existing test log
  selftests/nolibc: add test support for ppc64
  selftests/nolibc: add test support for ppc64le
  selftests/nolibc: add test support for ppc
  selftests/nolibc: add XARCH and ARCH mapping support
  tools/nolibc: add support for powerpc64
  tools/nolibc: add support for powerpc
  MAINTAINERS: nolibc: add myself as co-maintainer
  selftests/nolibc: enable compiler warnings
  selftests/nolibc: don't strip nolibc-test
  selftests/nolibc: prevent out of bounds access in expect_vfprintf
  selftests/nolibc: use correct return type for read() and write()
  selftests/nolibc: avoid sign-compare warnings
  selftests/nolibc: avoid unused parameter warnings
  selftests/nolibc: make functions static if possible
  ...

1 files changed, 27 insertions, 0 deletions

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 0eef91daf289..cae402c11e57 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -21,6 +21,11 @@
 #define EOF (-1)
 #endif
 
+/* Buffering mode used by setvbuf.  */
+#define _IOFBF 0	/* Fully buffered. */
+#define _IOLBF 1	/* Line buffered. */
+#define _IONBF 2	/* No buffering. */
+
 /* just define FILE as a non-empty type. The value of the pointer gives
  * the FD: FILE=~fd for fd>=0 or NULL for fd<0. This way positive FILE
  * are immediately identified as abnormal entries (i.e. possible copies
@@ -350,6 +355,28 @@ void perror(const char *msg)
 	fprintf(stderr, "%s%serrno=%d\n", (msg && *msg) ? msg : "", (msg && *msg) ? ": " : "", errno);
 }
 
+static __attribute__((unused))
+int setvbuf(FILE *stream __attribute__((unused)),
+	    char *buf __attribute__((unused)),
+	    int mode,
+	    size_t size __attribute__((unused)))
+{
+	/*
+	 * nolibc does not support buffering so this is a nop. Just check mode
+	 * is valid as required by the spec.
+	 */
+	switch (mode) {
+	case _IOFBF:
+	case _IOLBF:
+	case _IONBF:
+		break;
+	default:
+		return EOF;
+	}
+
+	return 0;
+}
+
 /* make sure to include all global symbols */
 #include "nolibc.h"