Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3int copy_fd(int ifd, int ofd)
   4{
   5        while (1) {
   6                int len;
   7                char buffer[8192];
   8                char *buf = buffer;
   9                len = read(ifd, buffer, sizeof(buffer));
  10                if (!len)
  11                        break;
  12                if (len < 0) {
  13                        int read_error;
  14                        if (errno == EAGAIN)
  15                                continue;
  16                        read_error = errno;
  17                        close(ifd);
  18                        return error("copy-fd: read returned %s",
  19                                     strerror(read_error));
  20                }
  21                while (1) {
  22                        int written = write(ofd, buf, len);
  23                        if (written > 0) {
  24                                buf += written;
  25                                len -= written;
  26                                if (!len)
  27                                        break;
  28                        }
  29                        if (!written)
  30                                return error("copy-fd: write returned 0");
  31                        if (errno == EAGAIN || errno == EINTR)
  32                                continue;
  33                        return error("copy-fd: write returned %s",
  34                                     strerror(errno));
  35                }
  36        }
  37        close(ifd);
  38        return 0;
  39}
  40