cryo does not (cannot ?) recreate files if the application created
a file before checkpoint and the file does not exist at the time
of restart.
Note that the 'flags' field in '/proc/$pid/fdinfo/$fd' will not
have the O_CREAT (or O_TRUNC, O_EXCL, O_NOCTTY) flags. These
are cleared in __dentry_open()).
At the time of restart, is there a way for cryo to know that the
file must be created ?
To reproduce:
- run following program,
- checkpoint after the first printf
- rm /tmp/foo1
- restart # fails to open file during restart
---
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/fcntl.h>
main()
{
int fd;
int i;
char *buf = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
fd = open("/tmp/foo1", O_RDWR|O_CREAT|O_TRUNC, 0666);
if (fd < 0) {
perror("open");
exit(1);
}
printf("%d: Opened '/tmp/foo1', fd %d\n", getpid(), fd);
for (i = 0; i < strlen(buf); i++) {
if (write(fd, &buf[i], 1) < 0) {
printf("Error %d writing %c to file, i %d\n",
errno, buf[i], i);
exit(1);
}
printf("%d: i %d, wrote %c\n", getpid(), i, buf[i]);
sleep(2);
}
}
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