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util: Copy file w/o sendfile

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This is the case when the in/out files are image cache/proxy sockets.

Signed-off-by: Rodrigo Bruno <rbruno@gsd.inesc-id.pt>
Signed-off-by: Katerina Koukiou <k.koukiou@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
rbruno@gsd.inesc-id.pt
2017-02-11 04:34:43 +01:00
committed by Andrei Vagin
parent d3ac1f40b8
commit 81ae3efbf2
1 changed files with 23 additions and 6 deletions
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29
criu/util.c
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@@ -564,29 +564,46 @@ int copy_file(int fd_in, int fd_out, size_t bytes)
{
ssize_t written = 0;
size_t chunk = bytes ? bytes : 4096;
char *buffer = (char*) malloc(chunk);
ssize_t ret;
while (1) {
ssize_t ret;
if (false) {
ret = read(fd_in, buffer, chunk);
if (ret < 0) {
pr_perror("Can't read from fd_in\n");
ret = -1;
goto err;
}
if (write(fd_out, buffer, ret) != ret) {
pr_perror("Couldn't write all read bytes\n");
ret = -1;
goto err;
}
} else
ret = sendfile(fd_out, fd_in, NULL, chunk);
ret = sendfile(fd_out, fd_in, NULL, chunk);
if (ret < 0) {
pr_perror("Can't send data to ghost file");
return -1;
ret = -1;
goto err;
}
if (ret == 0) {
if (bytes && (written != bytes)) {
pr_err("Ghost file size mismatch %zu/%zu\n",
written, bytes);
return -1;
ret = -1;
goto err;
}
break;
}
written += ret;
}
return 0;
err:
free(buffer);
return ret;
}
int read_fd_link(int lfd, char *buf, size_t size)