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lib: Exec func on each netns

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Added possibility to run some func on each netns.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
This commit is contained in:
Vadim Kochan 2015-01-18 16:10:17 +02:00 committed by Stephen Hemminger
parent 4c7d75de95
commit e998e118dd
4 changed files with 60 additions and 0 deletions
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6
include/namespace.h
View File

@ -44,5 +44,11 @@ static inline int setns(int fd, int nstype)
extern int netns_switch(char *netns);
extern int netns_get_fd(const char *netns);
extern int netns_foreach(int (*func)(char *nsname, void *arg), void *arg);
struct netns_func {
int (*func)(char *nsname, void *arg);
void *arg;
};
#endif /* __NAMESPACE_H__ */

4
include/utils.h
View File

@ -5,6 +5,7 @@
#include <asm/types.h>
#include <resolv.h>
#include <stdlib.h>
#include <stdbool.h>
#include "libnetlink.h"
#include "ll_map.h"
@ -162,4 +163,7 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,
char **name, char **type, char **link, char **dev,
int *group, int *index);
extern int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
bool show_label);
#endif /* __UTILS_H__ */

22
lib/namespace.c
View File

@ -99,3 +99,25 @@ int netns_get_fd(const char *name)
}
return open(path, O_RDONLY);
}
int netns_foreach(int (*func)(char *nsname, void *arg), void *arg)
{
DIR *dir;
struct dirent *entry;
dir = opendir(NETNS_RUN_DIR);
if (!dir)
return -1;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
if (func(entry->d_name, arg))
break;
}
closedir(dir);
return 0;
}

28
lib/utils.c
View File

@ -31,6 +31,7 @@
#include "utils.h"
#include "namespace.h"
int timestamp_short = 0;
@ -878,3 +879,30 @@ void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n)
tstr[strlen(tstr)-1] = 0;
fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
}
static int on_netns(char *nsname, void *arg)
{
struct netns_func *f = arg;
if (netns_switch(nsname))
return -1;
return f->func(nsname, f->arg);
}
static int on_netns_label(char *nsname, void *arg)
{
printf("\nnetns: %s\n", nsname);
return on_netns(nsname, arg);
}
int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
bool show_label)
{
struct netns_func nsf = { .func = func, .arg = arg };
if (show_label)
return netns_foreach(on_netns_label, &nsf);
return netns_foreach(on_netns, &nsf);
}