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nstool: Helpers to iterate through namespace types

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Will make things a bit less verbose in future.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2023-04-06 13:28:13 +10:00 committed by Stefano Brivio
parent f6a9ea3af5
commit 3bcbca5db8
1 changed files with 12 additions and 10 deletions
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22
test/nstool.c
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@ -46,6 +46,14 @@ const struct ns_type nstypes[] = {
{ CLONE_NEWUTS, "uts" },
};
#define for_each_nst(_nst, _flags) \
for ((_nst) = &nstypes[0]; \
((_nst) - nstypes) < ARRAY_SIZE(nstypes); \
(_nst)++) \
if ((_flags) & (_nst)->flag)
#define for_every_nst(_nst) for_each_nst(_nst, INT_MAX)
#define NSTOOL_MAGIC 0x7570017575601d75ULL
struct holder_info {
@ -199,11 +207,10 @@ static ssize_t getlink(char *buf, size_t bufsiz, const char *fmt, ...)
static int detect_namespaces(pid_t pid)
{
int i;
const struct ns_type *nst;
int flags = 0;
for (i = 0; i < ARRAY_SIZE(nstypes); i++) {
const struct ns_type *nst = &nstypes[i];
for_every_nst(nst) {
char selflink[PATH_MAX], pidlink[PATH_MAX];
ssize_t selflen, pidlen;
@ -221,15 +228,10 @@ static int detect_namespaces(pid_t pid)
static void print_nstypes(int flags)
{
const struct ns_type *nst;
bool first = true;
int i;
for (i = 0; i < ARRAY_SIZE(nstypes); i++) {
const struct ns_type *nst = &nstypes[i];
if (!(flags & nst->flag))
continue;
for_each_nst(nst, flags) {
printf("%s%s", first ? "" : ", " , nst->name);
first = false;
flags &= ~nst->flag;