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pidfd-util: introduce pidfd_get_{ppid,uid,cgroupid} which goes via PIDFD_GET_INFO too

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This commit is contained in:
Mike Yuan
2024-11-19 20:57:41 +01:00
parent dcf0ef3f42
commit 85e7bbfaa4
2 changed files with 58 additions and 0 deletions
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54
src/basic/pidfd-util.c
View File

@@ -176,6 +176,60 @@ int pidfd_verify_pid(int pidfd, pid_t pid) {
return current_pid != pid ? -ESRCH : 0;
}
int pidfd_get_ppid(int fd, pid_t *ret) {
struct pidfd_info info = { .mask = PIDFD_INFO_PID };
int r;
assert(fd >= 0);
r = pidfd_get_info(fd, &info);
if (r < 0)
return r;
assert(FLAGS_SET(info.mask, PIDFD_INFO_PID));
if (info.ppid == 0)
return -EADDRNOTAVAIL;
if (ret)
*ret = info.ppid;
return 0;
}
int pidfd_get_uid(int fd, uid_t *ret) {
struct pidfd_info info = { .mask = PIDFD_INFO_CREDS };
int r;
assert(fd >= 0);
r = pidfd_get_info(fd, &info);
if (r < 0)
return r;
assert(FLAGS_SET(info.mask, PIDFD_INFO_CREDS));
if (ret)
*ret = info.ruid;
return 0;
}
int pidfd_get_cgroupid(int fd, uint64_t *ret) {
struct pidfd_info info = { .mask = PIDFD_INFO_CGROUPID };
int r;
assert(fd >= 0);
r = pidfd_get_info(fd, &info);
if (r < 0)
return r;
assert(FLAGS_SET(info.mask, PIDFD_INFO_CGROUPID));
if (ret)
*ret = info.cgroupid;
return 0;
}
int pidfd_get_inode_id(int fd, uint64_t *ret) {
int r;

4
src/basic/pidfd-util.h
View File

@@ -12,4 +12,8 @@ int pidfd_get_namespace(int fd, unsigned long ns_type_cmd);
int pidfd_get_pid(int fd, pid_t *ret);
int pidfd_verify_pid(int pidfd, pid_t pid);
int pidfd_get_ppid(int fd, pid_t *ret);
int pidfd_get_uid(int fd, uid_t *ret);
int pidfd_get_cgroupid(int fd, uint64_t *ret);
int pidfd_get_inode_id(int fd, uint64_t *ret);