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ip netns: Identify netns for the current process 

As 'ip' util will share the same netns from the caller
process then we can just look at /proc/self/.. to show
the netns of the current process by:

    ip netns id

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
This commit is contained in:
vadimk 2014-11-07 18:25:30 +02:00 committed by Stephen Hemminger
parent 18f39a3a02
commit 0948adc01a
2 changed files with 14 additions and 15 deletions
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22
ip/ipnetns.c
View File

@ -59,7 +59,7 @@ static int usage(void)
fprintf(stderr, "Usage: ip netns list\n"); fprintf(stderr, "Usage: ip netns list\n");
fprintf(stderr, " ip netns add NAME\n"); fprintf(stderr, " ip netns add NAME\n");
fprintf(stderr, " ip netns delete NAME\n"); fprintf(stderr, " ip netns delete NAME\n");
fprintf(stderr, " ip netns identify PID\n"); fprintf(stderr, " ip netns identify [PID]\n");
fprintf(stderr, " ip netns pids NAME\n"); fprintf(stderr, " ip netns pids NAME\n");
fprintf(stderr, " ip netns exec NAME cmd ...\n"); fprintf(stderr, " ip netns exec NAME cmd ...\n");
fprintf(stderr, " ip netns monitor\n"); fprintf(stderr, " ip netns monitor\n");
@ -299,19 +299,17 @@ static int netns_identify(int argc, char **argv)
struct dirent *entry; struct dirent *entry;
if (argc < 1) { if (argc < 1) {
fprintf(stderr, "No pid specified\n"); pidstr = "self";
return -1; } else if (argc > 1) {
}
if (argc > 1) {
fprintf(stderr, "extra arguments specified\n"); fprintf(stderr, "extra arguments specified\n");
return -1; return -1;
} } else {
pidstr = argv[0]; pidstr = argv[0];
if (!is_pid(pidstr)) {
if (!is_pid(pidstr)) { fprintf(stderr, "Specified string '%s' is not a pid\n",
fprintf(stderr, "Specified string '%s' is not a pid\n", pidstr);
pidstr); return -1;
return -1; }
} }
snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr); snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr);

7
man/man8/ip-netns.8
View File

@ -21,7 +21,7 @@ ip-netns \- process network namespace management
.ti -8 .ti -8
.BR "ip netns identify" .BR "ip netns identify"
.I PID .RI "[ " PID " ]"
.ti -8 .ti -8
.BR "ip netns pids" .BR "ip netns pids"
@ -85,10 +85,11 @@ persists until it has no more users. ip netns delete may fail if
the mount point is in use in another mount namespace. the mount point is in use in another mount namespace.
.TP .TP
.B ip netns identify PID - Report network namespaces names for process .B ip netns identify [PID] - Report network namespaces names for process
.sp .sp
This command walks through /var/run/netns and finds all the network This command walks through /var/run/netns and finds all the network
namespace names for network namespace of the specified process. namespace names for network namespace of the specified process, if PID is
not specified then the current process will be used.
.TP .TP
.B ip netns pids NAME - Report processes in the named network namespace .B ip netns pids NAME - Report processes in the named network namespace