GN: aix port along with linux_s390x, linux_ppc64 and linux_ppc64le support.

base/files/file_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/files/file.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
 #include <sys/stat.h>
@@ skipping 26 matching lines @@
 }
 #else
 int CallFstat(int fd, stat_wrapper_t *sb) {
   ThreadRestrictions::AssertIOAllowed();
   return fstat64(fd, sb);
 }
 #endif
 
 // NaCl doesn't provide the following system calls, so either simulate them or
 // wrap them in order to minimize the number of #ifdef's in this file.
-#if !defined(OS_NACL)
+#if !defined(OS_NACL) && !defined(OS_AIX)
 bool IsOpenAppend(PlatformFile file) {
   return (fcntl(file, F_GETFL) & O_APPEND) != 0;
 }
 
 int CallFtruncate(PlatformFile file, int64_t length) {
   return HANDLE_EINTR(ftruncate(file, length));
 }
 
 int CallFutimes(PlatformFile file, const struct timeval times[2]) {
 #ifdef __USE_XOPEN2K8
@@ skipping 15 matching lines @@
 File::Error CallFcntlFlock(PlatformFile file, bool do_lock) {
   struct flock lock;
   lock.l_type = do_lock ? F_WRLCK : F_UNLCK;
   lock.l_whence = SEEK_SET;
   lock.l_start = 0;
   lock.l_len = 0;  // Lock entire file.
   if (HANDLE_EINTR(fcntl(file, F_SETLK, &lock)) == -1)
     return File::OSErrorToFileError(errno);
   return File::FILE_OK;
 }
-#else  // defined(OS_NACL)
+#else   // defined(OS_NACL) && !defined(OS_AIX)
 
 bool IsOpenAppend(PlatformFile file) {
   // NaCl doesn't implement fcntl. Since NaCl's write conforms to the POSIX
   // standard and always appends if the file is opened with O_APPEND, just
   // return false here.
   return false;
 }
 
 int CallFtruncate(PlatformFile file, int64_t length) {
   NOTIMPLEMENTED();  // NaCl doesn't implement ftruncate.
@@ skipping 431 matching lines @@
   return !HANDLE_EINTR(fsync(file_.get()));
 #endif
 }
 
 void File::SetPlatformFile(PlatformFile file) {
   DCHECK(!file_.is_valid());
   file_.reset(file);
 }
 
 }  // namespace base