Fix type warning on Windows.

Add cast since read / write has unsigned return type on windows.

include/jemalloc/internal/malloc_io.h

@@ -63,4 +63,40 @@ void malloc_cprintf(void (*write_cb)(void *, const char *), void *cbopaque,
     const char *format, ...) JEMALLOC_FORMAT_PRINTF(3, 4);
 void malloc_printf(const char *format, ...) JEMALLOC_FORMAT_PRINTF(1, 2);
 
+static inline ssize_t
+malloc_write_fd(int fd, const void *buf, size_t count) {
+#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_write)
+	/*
+	 * Use syscall(2) rather than write(2) when possible in order to avoid
+	 * the possibility of memory allocation within libc.  This is necessary
+	 * on FreeBSD; most operating systems do not have this problem though.
+	 *
+	 * syscall() returns long or int, depending on platform, so capture the
+	 * result in the widest plausible type to avoid compiler warnings.
+	 */
+	long result = syscall(SYS_write, fd, buf, count);
+#else
+	ssize_t result = (ssize_t)write(fd, buf,
+#ifdef _WIN32
+	    (unsigned int)
+#endif
+	    count);
+#endif
+	return (ssize_t)result;
+}
+
+static inline ssize_t
+malloc_read_fd(int fd, void *buf, size_t count) {
+#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_read)
+	long result = syscall(SYS_read, fd, buf, count);
+#else
+	ssize_t result = read(fd, buf,
+#ifdef _WIN32
+	    (unsigned int)
+#endif
+	    count);
+#endif
+	return (ssize_t)result;
+}
+
 #endif /* JEMALLOC_INTERNAL_MALLOC_IO_H */

src/malloc_io.c

@@ -70,20 +70,7 @@ static char *x2s(uintmax_t x, bool alt_form, bool uppercase, char *s,
 /* malloc_message() setup. */
 static void
 wrtmessage(void *cbopaque, const char *s) {
-#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_write)
-	/*
-	 * Use syscall(2) rather than write(2) when possible in order to avoid
-	 * the possibility of memory allocation within libc.  This is necessary
-	 * on FreeBSD; most operating systems do not have this problem though.
-	 *
-	 * syscall() returns long or int, depending on platform, so capture the
-	 * unused result in the widest plausible type to avoid compiler
-	 * warnings.
-	 */
-	UNUSED long result = syscall(SYS_write, STDERR_FILENO, s, strlen(s));
-#else
-	UNUSED ssize_t result = write(STDERR_FILENO, s, strlen(s));
-#endif
+	malloc_write_fd(STDERR_FILENO, s, strlen(s));
 }
 
 JEMALLOC_EXPORT void	(*je_malloc_message)(void *, const char *s);

src/pages.c

@@ -436,7 +436,6 @@ static bool
 os_overcommits_proc(void) {
 	int fd;
 	char buf[1];
-	ssize_t nread;
 
 #if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
 	#if defined(O_CLOEXEC)
@@ -474,12 +473,7 @@ os_overcommits_proc(void) {
 		return false; /* Error. */
 	}
 
-#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_read)
-	nread = (ssize_t)syscall(SYS_read, fd, &buf, sizeof(buf));
-#else
-	nread = read(fd, &buf, sizeof(buf));
-#endif
-
+	ssize_t nread = malloc_read_fd(fd, &buf, sizeof(buf));
 #if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
 	syscall(SYS_close, fd);
 #else
@@ -543,12 +537,7 @@ init_thp_state(void) {
 		goto label_error;
 	}
 
-#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_read)
-	ssize_t nread = (ssize_t)syscall(SYS_read, fd, &buf, sizeof(buf));
-#else
-	ssize_t nread = read(fd, &buf, sizeof(buf));
-#endif
-
+	ssize_t nread = malloc_read_fd(fd, &buf, sizeof(buf));
 #if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
 	syscall(SYS_close, fd);
 #else

src/prof.c

@@ -978,7 +978,7 @@ prof_dump_flush(bool propagate_err) {
 
 	cassert(config_prof);
 
-	err = write(prof_dump_fd, prof_dump_buf, prof_dump_buf_end);
+	err = malloc_write_fd(prof_dump_fd, prof_dump_buf, prof_dump_buf_end);
 	if (err == -1) {
 		if (!propagate_err) {
 			malloc_write("<jemalloc>: write() failed during heap "
@@ -1471,8 +1471,9 @@ prof_dump_maps(bool propagate_err) {
 					goto label_return;
 				}
 			}
-			nread = read(mfd, &prof_dump_buf[prof_dump_buf_end],
-			    PROF_DUMP_BUFSIZE - prof_dump_buf_end);
+			nread = malloc_read_fd(mfd,
+			    &prof_dump_buf[prof_dump_buf_end], PROF_DUMP_BUFSIZE
+			    - prof_dump_buf_end);
 		} while (nread > 0);
 	} else {
 		ret = true;

test/unit/stats_print.c

@@ -67,7 +67,7 @@ token_error(token_t *token) {
 		    token->col);
 		break;
 	}
-	UNUSED ssize_t err = write(STDERR_FILENO,
+	UNUSED ssize_t err = malloc_write_fd(STDERR_FILENO,
 	    &token->parser->buf[token->pos], token->len);
 	malloc_printf("\n");
 }