8341967: Unify os::current_file_offset and os::seek_to_file_offset across posix platforms

Reviewed-by: jsjolen, mdoerr

Author: MBaesken

src/hotspot/os/aix/os_aix.cpp

@@ -2483,16 +2483,6 @@ int os::open(const char *path, int oflag, int mode) {
   return fd;
 }
 
-// return current position of file pointer
-jlong os::current_file_offset(int fd) {
-  return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
-}
-
-// move file pointer to the specified offset
-jlong os::seek_to_file_offset(int fd, jlong offset) {
-  return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
-}
-
 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
 // of a thread.

src/hotspot/os/bsd/os_bsd.cpp

@@ -2400,16 +2400,6 @@ int os::open(const char *path, int oflag, int mode) {
   return fd;
 }
 
-// return current position of file pointer
-jlong os::current_file_offset(int fd) {
-  return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
-}
-
-// move file pointer to the specified offset
-jlong os::seek_to_file_offset(int fd, jlong offset) {
-  return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
-}
-
 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
 // of a thread.

src/hotspot/os/linux/os_linux.cpp

@@ -5053,16 +5053,6 @@ int os::open(const char *path, int oflag, int mode) {
   return fd;
 }
 
-// return current position of file pointer
-jlong os::current_file_offset(int fd) {
-  return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
-}
-
-// move file pointer to the specified offset
-jlong os::seek_to_file_offset(int fd, jlong offset) {
-  return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
-}
-
 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time);
 
 static jlong fast_cpu_time(Thread *thread) {

src/hotspot/os/posix/os_posix.cpp

@@ -348,6 +348,16 @@ int os::create_file_for_heap(const char* dir) {
   return fd;
 }
 
+// return current position of file pointer
+jlong os::current_file_offset(int fd) {
+  return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
+}
+
+// move file pointer to the specified offset
+jlong os::seek_to_file_offset(int fd, jlong offset) {
+  return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
+}
+
 // Is a (classpath) directory empty?
 bool os::dir_is_empty(const char* path) {
   DIR *dir = nullptr;