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namespace-util: rename arguments to prefix 'ret_'

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Also reorder opening namespace fd to make it match with the order of the
arguments.
This commit is contained in:
Yu Watanabe 2024-01-17 04:20:06 +09:00
parent f14686c1d2
commit 5178d4a77e
2 changed files with 48 additions and 35 deletions
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75
src/basic/namespace-util.c
View file

@ -33,71 +33,78 @@ const struct namespace_info namespace_info[] = {
#define pid_namespace_path(pid, type) procfs_file_alloca(pid, namespace_info[type].proc_path)
int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd) {
_cleanup_close_ int pidnsfd = -EBADF, mntnsfd = -EBADF, netnsfd = -EBADF, usernsfd = -EBADF;
int rfd = -EBADF;
int namespace_open(
pid_t pid,
int *ret_pidns_fd,
int *ret_mntns_fd,
int *ret_netns_fd,
int *ret_userns_fd,
int *ret_root_fd) {
_cleanup_close_ int pidns_fd = -EBADF, mntns_fd = -EBADF, netns_fd = -EBADF,
userns_fd = -EBADF, root_fd = -EBADF;
assert(pid >= 0);
if (mntns_fd) {
const char *mntns;
mntns = pid_namespace_path(pid, NAMESPACE_MOUNT);
mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (mntnsfd < 0)
return -errno;
}
if (pidns_fd) {
if (ret_pidns_fd) {
const char *pidns;
pidns = pid_namespace_path(pid, NAMESPACE_PID);
pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (pidnsfd < 0)
pidns_fd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (pidns_fd < 0)
return -errno;
}
if (netns_fd) {
if (ret_mntns_fd) {
const char *mntns;
mntns = pid_namespace_path(pid, NAMESPACE_MOUNT);
mntns_fd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (mntns_fd < 0)
return -errno;
}
if (ret_netns_fd) {
const char *netns;
netns = pid_namespace_path(pid, NAMESPACE_NET);
netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (netnsfd < 0)
netns_fd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (netns_fd < 0)
return -errno;
}
if (userns_fd) {
if (ret_userns_fd) {
const char *userns;
userns = pid_namespace_path(pid, NAMESPACE_USER);
usernsfd = open(userns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (usernsfd < 0 && errno != ENOENT)
userns_fd = open(userns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
if (userns_fd < 0 && errno != ENOENT)
return -errno;
}
if (root_fd) {
if (ret_root_fd) {
const char *root;
root = procfs_file_alloca(pid, "root");
rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (rfd < 0)
root_fd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (root_fd < 0)
return -errno;
}
if (pidns_fd)
*pidns_fd = TAKE_FD(pidnsfd);
if (ret_pidns_fd)
*ret_pidns_fd = TAKE_FD(pidns_fd);
if (mntns_fd)
*mntns_fd = TAKE_FD(mntnsfd);
if (ret_mntns_fd)
*ret_mntns_fd = TAKE_FD(mntns_fd);
if (netns_fd)
*netns_fd = TAKE_FD(netnsfd);
if (ret_netns_fd)
*ret_netns_fd = TAKE_FD(netns_fd);
if (userns_fd)
*userns_fd = TAKE_FD(usernsfd);
if (ret_userns_fd)
*ret_userns_fd = TAKE_FD(userns_fd);
if (root_fd)
*root_fd = TAKE_FD(rfd);
if (ret_root_fd)
*ret_root_fd = TAKE_FD(root_fd);
return 0;
}

8
src/basic/namespace-util.h
View file

@ -22,7 +22,13 @@ extern const struct namespace_info {
unsigned int clone_flag;
} namespace_info[_NAMESPACE_TYPE_MAX + 1];
int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd);
int namespace_open(
pid_t pid,
int *ret_pidns_fd,
int *ret_mntns_fd,
int *ret_netns_fd,
int *ret_userns_fd,
int *ret_root_fd);
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd);
int fd_is_ns(int fd, unsigned long nsflag);