Description of problem:

glibc misses sync_file_range syscall interface.
The header file and man page both say 'sync_file_range' should exist.
From man page, sync_file_range should exist sinc kernel-2.6.17

Version-Release number of selected component (if applicable):

RHEL-5.3
glibc-2.5-34

How reproducible:

100%

Steps to Reproduce:
1. use nm to detect symbol

~]# nm -D /lib64/*.so* | fgrep sync_file_range
nothing found.

2. use gcc to detect symbol
~]# cat s.cc 
#define __GNU_SOURCE

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

char buffer[10000];

int main()
{
        int fd = open("./xxx", O_RDWR|O_CREAT, 0666);
        if (fd < 0) {
                perror("open");
                exit(1);
        }
        if (write(fd, &buffer, sizeof(buffer)) <= 0) {
                perror("write");
                exit(1);
        }
        if (sync_file_range(fd, 0, 8192, SYNC_FILE_RANGE_WRITE) < 0) {
                perror("sync_file_range");
                exit(1);
        }

}
~]# g++ s.cc -lrt -lpthread -lcrypt -lutil -lresolv -lm -lnsl -lanl -lcidn 
/tmp/ccOaK6Vj.o: In function `main':
s.cc:(.text+0x81): undefined reference to `sync_file_range'
collect2: ld returned 1 exit status
  
Actual results:
nm found no .so contains sync_file_range

Expected results:



Additional info: