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sysctl: Make CTL_READ nonfatal

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Some entries might be missing and that should not cause
CRIU to stop dumping when we know the entries are safe
to unuse.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov 2015-05-08 15:43:39 +03:00 committed by Pavel Emelyanov
parent a1b2b10b93
commit 121e0b906f
3 changed files with 9 additions and 0 deletions
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6
include/sysctl.h
View File

@ -5,6 +5,7 @@ struct sysctl_req {
char *name;
void *arg;
int type;
int flags;
};
extern int sysctl_op(struct sysctl_req *req, size_t nr_req, int op);
@ -30,4 +31,9 @@ enum {
#define CTL_LEN(t) ((t) >> CTL_SHIFT)
#define CTL_TYPE(t) ((t) & ((1 << CTL_SHIFT) - 1))
/*
* Some entries might be missing mark them as optional.
*/
#define CTL_FLAGS_OPTIONAL 1
#endif /* __CR_SYSCTL_H__ */

1
net.c
View File

@ -104,6 +104,7 @@ static int ipv4_conf_op(char *tgt, int *conf, int op, NetnsEntry **netns)
req[ri].name = path[i];
req[ri].arg = &conf[i];
req[ri].type = CTL_32;
req[ri].flags = 0;
ri++;
}

2
sysctl.c
View File

@ -137,6 +137,8 @@ static int __sysctl_op(int dir, struct sysctl_req *req, int op)
fd = openat(dir, req->name, flags);
if (fd < 0) {
if (errno == ENOENT && (req->flags & CTL_FLAGS_OPTIONAL))
return 0;
pr_perror("Can't open sysctl %s", req->name);
return -1;
}