Merge "use architecture-specific ssize_t definition"

libc/include/sys/types.h

@@ -85,7 +85,7 @@ typedef  .... pthread_t;
 
 #ifndef _SSIZE_T_DEFINED_
 #define _SSIZE_T_DEFINED_
-typedef long int  ssize_t;
+typedef __kernel_ssize_t ssize_t;
 #endif
 
 typedef __kernel_suseconds_t  suseconds_t;

tests/stdio_test.cpp

@@ -169,3 +169,12 @@ TEST(stdio, getline_invalid) {
   ASSERT_EQ(getline(&buffer, &buffer_length, fp), -1);
   ASSERT_EQ(EBADF, errno);
 }
+
+TEST(stdio, printf_ssize_t) {
+  // We used to have a ssize_t definition that confused GCC into saying:
+  // error: format '%zd' expects argument of type 'signed size_t',
+  //     but argument 4 has type 'ssize_t {aka long int}' [-Werror=format]
+  ssize_t v = 1;
+  char buf[32];
+  snprintf(buf, sizeof(buf), "%zd", v);
+}