LXR linux/include/linux/coredump.h

   1#ifndef _LINUX_COREDUMP_H
   2#define _LINUX_COREDUMP_H
   3
   4#include <linux/types.h>
   5#include <linux/mm.h>
   6#include <linux/fs.h>
   7
   8/*
   9 * These are the only things you should do on a core-file: use only these
  10 * functions to write out all the necessary info.
  11 */
  12static inline int dump_write(struct file *file, const void *addr, int nr)
  13{
  14        return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
  15}
  16
  17static inline int dump_seek(struct file *file, loff_t off)
  18{
  19        int ret = 1;
  20
  21        if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
  22                if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
  23                        return 0;
  24        } else {
  25                char *buf = (char *)get_zeroed_page(GFP_KERNEL);
  26
  27                if (!buf)
  28                        return 0;
  29                while (off > 0) {
  30                        unsigned long n = off;
  31
  32                        if (n > PAGE_SIZE)
  33                                n = PAGE_SIZE;
  34                        if (!dump_write(file, buf, n)) {
  35                                ret = 0;
  36                                break;
  37                        }
  38                        off -= n;
  39                }
  40                free_page((unsigned long)buf);
  41        }
  42        return ret;
  43}
  44
  45#endif /* _LINUX_COREDUMP_H */
  46