8183227: read/write APIs in class os shall return ssize_t

Reviewed-by: fparain, rehn

src/hotspot/os/linux/attachListener_linux.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -385,7 +385,7 @@ LinuxAttachOperation* LinuxAttachListener::dequeue() {
 // write the given buffer to the socket
 int LinuxAttachListener::write_fully(int s, char* buf, int len) {
   do {
-    int n = ::write(s, buf, len);
+    ssize_t n = ::write(s, buf, len);
     if (n == -1) {
       if (errno != EINTR) return -1;
     } else {

src/hotspot/os/posix/os_posix.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -679,9 +679,9 @@ FILE* os::open(int fd, const char* mode) {
   return ::fdopen(fd, mode);
 }
 
-size_t os::write(int fd, const void *buf, unsigned int nBytes) {
-  size_t res;
-  RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
+ssize_t os::write(int fd, const void *buf, unsigned int nBytes) {
+  ssize_t res;
+  RESTARTABLE(::write(fd, buf, (size_t) nBytes), res);
   return res;
 }
 

src/hotspot/os/posix/perfMemory_posix.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2022, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012, 2021 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -98,21 +98,20 @@ static void save_memory_to_file(char* addr, size_t size) {
   const char* destfile = PerfMemory::get_perfdata_file_path();
   assert(destfile[0] != '\0', "invalid PerfData file path");
 
-  int result;
+  int fd;
 
-  RESTARTABLE(os::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR|S_IWUSR),
-              result);
-  if (result == OS_ERR) {
+  RESTARTABLE(os::open(destfile, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR|S_IWUSR), fd);
+  if (fd == OS_ERR) {
     if (PrintMiscellaneous && Verbose) {
       warning("Could not create Perfdata save file: %s: %s\n",
               destfile, os::strerror(errno));
     }
   } else {
-    int fd = result;
+    ssize_t result;
 
     for (size_t remaining = size; remaining > 0;) {
 
-      RESTARTABLE(::write(fd, addr, remaining), result);
+      result = os::write(fd, addr, remaining);
       if (result == OS_ERR) {
         if (PrintMiscellaneous && Verbose) {
           warning("Could not write Perfdata save file: %s: %s\n",
@@ -125,7 +124,7 @@ static void save_memory_to_file(char* addr, size_t size) {
       addr += result;
     }
 
-    result = ::close(fd);
+    result = os::close(fd);
     if (PrintMiscellaneous && Verbose) {
       if (result == OS_ERR) {
         warning("Could not close %s: %s\n", destfile, os::strerror(errno));
@@ -842,9 +841,9 @@ static int create_sharedmem_resources(const char* dirname, const char* filename,
   // Open the filename in the current directory.
   // Cannot use O_TRUNC here; truncation of an existing file has to happen
   // after the is_file_secure() check below.
-  int result;
-  RESTARTABLE(os::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IRUSR|S_IWUSR), result);
-  if (result == OS_ERR) {
+  int fd;
+  RESTARTABLE(os::open(filename, O_RDWR|O_CREAT|O_NOFOLLOW, S_IRUSR|S_IWUSR), fd);
+  if (fd == OS_ERR) {
     if (PrintMiscellaneous && Verbose) {
       if (errno == ELOOP) {
         warning("file %s is a symlink and is not secure\n", filename);
@@ -860,15 +859,14 @@ static int create_sharedmem_resources(const char* dirname, const char* filename,
   // close the directory and reset the current working directory
   close_directory_secure_cwd(dirp, saved_cwd_fd);
 
-  // save the file descriptor
-  int fd = result;
-
   // check to see if the file is secure
   if (!is_file_secure(fd, filename)) {
     ::close(fd);
     return -1;
   }
 
+  ssize_t result;
+
   // truncate the file to get rid of any existing data
   RESTARTABLE(::ftruncate(fd, (off_t)0), result);
   if (result == OS_ERR) {
@@ -895,7 +893,7 @@ static int create_sharedmem_resources(const char* dirname, const char* filename,
     int zero_int = 0;
     result = (int)os::seek_to_file_offset(fd, (jlong)(seekpos));
     if (result == -1 ) break;
-    RESTARTABLE(::write(fd, &zero_int, 1), result);
+    result = os::write(fd, &zero_int, 1);
     if (result != 1) {
       if (errno == ENOSPC) {
         warning("Insufficient space for shared memory file:\n   %s\nTry using the -Djava.io.tmpdir= option to select an alternate temp location.\n", filename);
@@ -907,7 +905,7 @@ static int create_sharedmem_resources(const char* dirname, const char* filename,
   if (result != -1) {
     return fd;
   } else {
-    ::close(fd);
+    os::close(fd);
     return -1;
   }
 }

src/hotspot/os/windows/os_windows.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -4758,7 +4758,7 @@ FILE* os::open(int fd, const char* mode) {
   return ::_fdopen(fd, mode);
 }
 
-size_t os::write(int fd, const void *buf, unsigned int nBytes) {
+ssize_t os::write(int fd, const void *buf, unsigned int nBytes) {
   return ::write(fd, buf, nBytes);
 }
 

src/hotspot/share/cds/filemap.cpp

@@ -1613,8 +1613,8 @@ size_t FileMapInfo::write_heap_regions(GrowableArray<MemRegion>* regions,
 
 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
   assert(_file_open, "must be");
-  size_t n = os::write(_fd, buffer, (unsigned int)nbytes);
-  if (n != nbytes) {
+  ssize_t n = os::write(_fd, buffer, (unsigned int)nbytes);
+  if (n < 0 || (size_t)n != nbytes) {
     // If the shared archive is corrupted, close it and remove it.
     close();
     remove(_full_path);

src/hotspot/share/jfr/writers/jfrStreamWriterHost.inline.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -76,7 +76,7 @@ inline void StreamWriterHost<Adapter, AP>::write_bytes(const u1* buf, intptr_t l
   assert(len >= 0, "invariant");
   while (len > 0) {
     const unsigned int nBytes = len > INT_MAX ? INT_MAX : (unsigned int)len;
-    const ssize_t num_written = (ssize_t)os::write(_fd, buf, nBytes);
+    const ssize_t num_written = os::write(_fd, buf, nBytes);
     guarantee(num_written > 0, "Nothing got written, or os::write() failed");
     _stream_pos += num_written;
     len -= num_written;

src/hotspot/share/prims/jvm.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2836,7 +2836,7 @@ void jio_print(const char* s, size_t len) {
     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
   } else {
     // Make an unused local variable to avoid warning from gcc compiler.
-    size_t count = ::write(defaultStream::output_fd(), s, (int)len);
+    ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
   }
 }
 

src/hotspot/share/runtime/os.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -565,7 +565,7 @@ class os: AllStatic {
 
   static ssize_t read(int fd, void *buf, unsigned int nBytes);
   static ssize_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset);
-  static size_t write(int fd, const void *buf, unsigned int nBytes);
+  static ssize_t write(int fd, const void *buf, unsigned int nBytes);
 
   // Reading directories.
   static DIR*           opendir(const char* dirname);

src/hotspot/share/services/heapDumperCompression.cpp

@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2020 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -54,7 +55,7 @@ char const* FileWriter::write_buf(char* buf, ssize_t size) {
   assert(_fd >= 0, "Must be open");
   assert(size > 0, "Must write at least one byte");
 
-  ssize_t n = (ssize_t) os::write(_fd, buf, (uint) size);
+  ssize_t n = os::write(_fd, buf, (uint) size);
 
   if (n <= 0) {
     return os::strerror(errno);

src/hotspot/share/utilities/ostream.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -614,7 +614,7 @@ void fileStream::flush() {
 void fdStream::write(const char* s, size_t len) {
   if (_fd != -1) {
     // Make an unused local variable to avoid warning from gcc compiler.
-    size_t count = ::write(_fd, s, (int)len);
+    ssize_t count = ::write(_fd, s, (int)len);
     update_position(s, len);
   }
 }