20355307520

Committed 18 Dec 2025 09:15PM UTC coverage: 72.578% (-0.1%) from 72.709%

Build # 20355307520

Build Type

push

github

Committed by

DaanDeMeyer

Commit Message

mkosi: update debian commit reference to d9f2aa170

* d9f2aa1704 Install systemd-tpm2-generator.8 only for UEFI builds
* ac1c7d8048 Drop dependencies on libcap-dev, no longer used since v259
* c36e5871ca Do not install systemd-sysv-generator.8 in upstream build
* bac0cca0e8 Install new files for upstream build
* 2855fb1302 Update changelog for 259-1 release

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87.7

/src/basic/pidref.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <sys/wait.h>
#include <unistd.h>

#include "alloc-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "hash-funcs.h"
#include "log.h"
#include "parse-util.h"
#include "pidfd-util.h"
#include "pidref.h"
#include "process-util.h"
#include "siphash24.h"

int pidref_acquire_pidfd_id(PidRef *pidref) {
        int r;

        assert(pidref);

        if (!pidref_is_set(pidref))
                return -ESRCH;

        if (pidref_is_remote(pidref))
                return -EREMOTE;

        if (pidref->fd < 0)
                return -ENOMEDIUM;

        if (pidref->fd_id > 0)
                return 0;

        r = pidfd_get_inode_id(pidref->fd, &pidref->fd_id);
        if (r < 0) {
                if (!ERRNO_IS_NEG_NOT_SUPPORTED(r))
                        log_debug_errno(r, "Failed to get inode number of pidfd for pid " PID_FMT ": %m",
                                        pidref->pid);
                return r;
        }

        return 0;
}

bool pidref_equal(PidRef *a, PidRef *b) {

        /* If this is the very same structure, it definitely refers to the same process */
        if (a == b)
                return true;

        if (!pidref_is_set(a))
                return !pidref_is_set(b);

        if (!pidref_is_set(b))
                return false;

        if (a->pid != b->pid)
                return false;

        if (pidref_is_remote(a)) {
                /* If one is remote and the other isn't, they are not the same */
                if (!pidref_is_remote(b))
                        return false;

                /* If both are remote, compare fd IDs if we have both, otherwise don't bother, and cut things short */
                if (a->fd_id == 0 || b->fd_id == 0)
                        return true;
        } else {
                /* If the other side is remote, then this is not the same */
                if (pidref_is_remote(b))
                        return false;

                /* PID1 cannot exit, hence it cannot change pidfs ids, hence no point in comparing them, we
                 * can shortcut things */
                if (a->pid == 1)
                        return true;

                /* Try to compare pidfds using their inode numbers. This way we can ensure that we
                 * don't spuriously consider two PidRefs equal if the pid has been reused once. Note
                 * that we ignore all errors here, not only EOPNOTSUPP, as fstat() might fail due to
                 * many reasons. */
                if (pidref_acquire_pidfd_id(a) < 0 || pidref_acquire_pidfd_id(b) < 0)
                        return true;
        }

        return a->fd_id == b->fd_id;
}

int pidref_set_pid(PidRef *pidref, pid_t pid) {
        uint64_t pidfdid = 0;
        int fd;

        assert(pidref);

        if (pid < 0)
                return -ESRCH;
        if (pid == 0) {
                pid = getpid_cached();
                (void) pidfd_get_inode_id_self_cached(&pidfdid);
        }

        fd = pidfd_open(pid, 0);
        if (fd < 0) {
                /* Graceful fallback in case the kernel is out of fds */
                if (!ERRNO_IS_RESOURCE(errno))
                        return log_debug_errno(errno, "Failed to open pidfd for pid " PID_FMT ": %m", pid);

                fd = -EBADF;
        }

        *pidref = (PidRef) {
                .fd = fd,
                .pid = pid,
                .fd_id = pidfdid,
        };

        return 0;
}

int pidref_set_pid_and_pidfd_id(
                PidRef *pidref,
                pid_t pid,
                uint64_t pidfd_id) {

        int r;

        assert(pidref);

        _cleanup_(pidref_done) PidRef n = PIDREF_NULL;
        r = pidref_set_pid(&n, pid);
        if (r < 0)
                return r;

        if (pidfd_id > 0) {
                r = pidref_acquire_pidfd_id(&n);
                if (r < 0 && !ERRNO_IS_NEG_NOT_SUPPORTED(r))
                        return r;

                if (n.fd_id != pidfd_id)
                        return -ESRCH;
        }

        *pidref = TAKE_PIDREF(n);
        return 0;
}

int pidref_set_pidstr(PidRef *pidref, const char *pid) {
        pid_t nr;
        int r;

        assert(pidref);

        r = parse_pid(pid, &nr);
        if (r < 0)
                return r;

        return pidref_set_pid(pidref, nr);
}

int pidref_set_pidfd(PidRef *pidref, int fd) {
        int r;

        assert(pidref);

        if (fd < 0)
                return -EBADF;

        int fd_copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
        if (fd_copy < 0) {
                pid_t pid;

                if (!ERRNO_IS_RESOURCE(errno))
                        return -errno;

                /* Graceful fallback if we are out of fds */
                r = pidfd_get_pid(fd, &pid);
                if (r < 0)
                        return r;

                *pidref = PIDREF_MAKE_FROM_PID(pid);
                return 0;
        }

        return pidref_set_pidfd_consume(pidref, fd_copy);
}

int pidref_set_pidfd_take(PidRef *pidref, int fd) {
        pid_t pid;
        int r;

        assert(pidref);

        if (fd < 0)
                return -EBADF;

        r = pidfd_get_pid(fd, &pid);
        if (r < 0)
                return r;

        *pidref = (PidRef) {
                .fd = fd,
                .pid = pid,
        };

        return 0;
}

int pidref_set_pidfd_consume(PidRef *pidref, int fd) {
        int r;

        r = pidref_set_pidfd_take(pidref, fd);
        if (r < 0)
                safe_close(fd);

        return r;
}

int pidref_set_parent(PidRef *ret) {
        _cleanup_(pidref_done) PidRef parent = PIDREF_NULL;
        pid_t ppid;
        int r;

        assert(ret);

        /* Acquires a pidref to our parent process. Deals with the fact that parent processes might exit, and
         * we get reparented to other processes, with our old parent's PID already being recycled. */

        ppid = getppid();
        for (;;) {
                r = pidref_set_pid(&parent, ppid);
                if (r < 0)
                        return r;

                if (parent.fd < 0) /* If pidfds are not available, then we are done */
                        break;

                pid_t now_ppid = getppid();
                if (now_ppid == ppid) /* If our ppid is still the same, then we are done */
                        break;

                /* Otherwise let's try again with the new ppid */
                ppid = now_ppid;
                pidref_done(&parent);
        }

        *ret = TAKE_PIDREF(parent);
        return 0;
}

void pidref_done(PidRef *pidref) {
        assert(pidref);

        *pidref = (PidRef) {
                .fd = safe_close(pidref->fd),
        };
}

PidRef* pidref_free(PidRef *pidref) {
        /* Regularly, this is an embedded structure. But sometimes we want it on the heap too */
        if (!pidref)
                return NULL;

        pidref_done(pidref);
        return mfree(pidref);
}

int pidref_copy(const PidRef *pidref, PidRef *ret) {
        _cleanup_(pidref_done) PidRef copy = PIDREF_NULL;

        /* If NULL is passed we'll generate a PidRef that refers to no process. This makes it easy to
         * copy pidref fields that might or might not reference a process yet. */

        assert(ret);

        if (pidref) {
                if (pidref_is_remote(pidref)) /* Propagate remote flag */
                        copy.fd = -EREMOTE;
                else if (pidref->fd >= 0) {
                        copy.fd = fcntl(pidref->fd, F_DUPFD_CLOEXEC, 3);
                        if (copy.fd < 0) {
                                if (!ERRNO_IS_RESOURCE(errno))
                                        return -errno;

                                copy.fd = -EBADF;
                        }
                }

                copy.pid = pidref->pid;
                copy.fd_id = pidref->fd_id;
        }

        *ret = TAKE_PIDREF(copy);
        return 0;
}

int pidref_dup(const PidRef *pidref, PidRef **ret) {
        _cleanup_(pidref_freep) PidRef *dup_pidref = NULL;
        int r;

        /* Allocates a new PidRef on the heap, making it a copy of the specified pidref. This does not try to
         * acquire a pidfd if we don't have one yet! */

        assert(ret);

        dup_pidref = newdup(PidRef, &PIDREF_NULL, 1);
        if (!dup_pidref)
                return -ENOMEM;

        r = pidref_copy(pidref, dup_pidref);
        if (r < 0)
                return r;

        *ret = TAKE_PTR(dup_pidref);
        return 0;
}

int pidref_new_from_pid(pid_t pid, PidRef **ret) {
        _cleanup_(pidref_freep) PidRef *n = NULL;
        int r;

        assert(ret);

        if (pid < 0)
                return -ESRCH;

        n = new(PidRef, 1);
        if (!n)
                return -ENOMEM;

        *n = PIDREF_NULL;

        r = pidref_set_pid(n, pid);
        if (r < 0)
                return r;

        *ret = TAKE_PTR(n);
        return 0;
}

int pidref_kill(const PidRef *pidref, int sig) {

        if (!pidref)
                return -ESRCH;

        if (pidref_is_remote(pidref))
                return -EREMOTE;

        if (pidref->fd >= 0)
                return RET_NERRNO(pidfd_send_signal(pidref->fd, sig, NULL, 0));

        if (pidref->pid > 0)
                return RET_NERRNO(kill(pidref->pid, sig));

        return -ESRCH;
}

int pidref_kill_and_sigcont(const PidRef *pidref, int sig) {
        int r;

        r = pidref_kill(pidref, sig);
        if (r < 0)
                return r;

        if (!IN_SET(sig, SIGCONT, SIGKILL))
                (void) pidref_kill(pidref, SIGCONT);

        return 0;
}

int pidref_sigqueue(const PidRef *pidref, int sig, int value) {

        if (!pidref)
                return -ESRCH;

        if (pidref_is_remote(pidref))
                return -EREMOTE;

        if (pidref->fd >= 0) {
                siginfo_t si;

                /* We can't use structured initialization here, since the structure contains various unions
                 * and these fields lie in overlapping (carefully aligned) unions that LLVM is allergic to
                 * allow assignments to */
                zero(si);
                si.si_signo = sig;
                si.si_code = SI_QUEUE;
                si.si_pid = getpid_cached();
                si.si_uid = getuid();
                si.si_value.sival_int = value;

                return RET_NERRNO(pidfd_send_signal(pidref->fd, sig, &si, 0));
        }

        if (pidref->pid > 0)
                return RET_NERRNO(sigqueue(pidref->pid, sig, (const union sigval) { .sival_int = value }));

        return -ESRCH;
}

int pidref_verify(const PidRef *pidref) {
        int r;

        /* This is a helper that is supposed to be called after reading information from procfs via a
         * PidRef. It ensures that the PID we track still matches the PIDFD we pin. If this value differs
         * after a procfs read, we might have read the data from a recycled PID. */

        if (!pidref_is_set(pidref))
                return -ESRCH;

        if (pidref_is_remote(pidref))
                return -EREMOTE;

        if (pidref->pid == 1)
                return 1; /* PID 1 can never go away, hence never be recycled to a different process → return 1 */

        if (pidref->fd < 0)
                return 0; /* If we don't have a pidfd we cannot validate it, hence we assume it's all OK → return 0 */

        r = pidfd_verify_pid(pidref->fd, pidref->pid);
        if (r < 0)
                return r;

        return 1; /* We have a pidfd and it still points to the PID we have, hence all is *really* OK → return 1 */
}

bool pidref_is_self(PidRef *pidref) {
        if (!pidref_is_set(pidref))
                return false;

        if (pidref_is_remote(pidref))
                return false;

        if (pidref->pid != getpid_cached())
                return false;

        /* PID1 cannot exit, hence no point in comparing pidfd IDs, they can never change */
        if (pidref->pid == 1)
                return true;

        /* Also compare pidfd ID if we can get it */
        if (pidref_acquire_pidfd_id(pidref) < 0)
                return true;

        uint64_t self_id;
        if (pidfd_get_inode_id_self_cached(&self_id) < 0)
                return true;

        return pidref->fd_id == self_id;
}

int pidref_wait(PidRef *pidref, siginfo_t *ret, int options) {
        int r;

        if (!pidref_is_set(pidref))
                return -ESRCH;

        if (pidref_is_remote(pidref))
                return -EREMOTE;

        if (pidref->pid == 1 || pidref_is_self(pidref))
                return -ECHILD;

        siginfo_t si = {};
        if (pidref->fd >= 0)
                r = RET_NERRNO(waitid(P_PIDFD, pidref->fd, &si, options));
        else
                r = RET_NERRNO(waitid(P_PID, pidref->pid, &si, options));
        if (r < 0)
                return r;

        if (ret)
                *ret = si;

        return 0;
}

int pidref_wait_for_terminate(PidRef *pidref, siginfo_t *ret) {
        int r;

        for (;;) {
                r = pidref_wait(pidref, ret, WEXITED);
                if (r != -EINTR)
                        return r;
        }
}

bool pidref_is_automatic(const PidRef *pidref) {
        return pidref && pid_is_automatic(pidref->pid);
}

void pidref_hash_func(const PidRef *pidref, struct siphash *state) {
        siphash24_compress_typesafe(pidref->pid, state);
}

int pidref_compare_func(const PidRef *a, const PidRef *b) {
        int r;

        assert(a);
        assert(b);

        r = CMP(pidref_is_set(a), pidref_is_set(b));
        if (r != 0)
                return r;

        r = CMP(pidref_is_automatic(a), pidref_is_automatic(b));
        if (r != 0)
                return r;

        r = CMP(pidref_is_remote(a), pidref_is_remote(b));
        if (r != 0)
                return r;

        r = CMP(a->pid, b->pid);
        if (r != 0)
                return r;

        if (a->fd_id != 0 && b->fd_id != 0)
                return CMP(a->fd_id, b->fd_id);

        return 0;
}

DEFINE_HASH_OPS(pidref_hash_ops, PidRef, pidref_hash_func, pidref_compare_func);

DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(pidref_hash_ops_free,
                                    PidRef, pidref_hash_func, pidref_compare_func,
                                    pidref_free);

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <sys/wait.h>
4	#include <unistd.h>
5
6	#include "alloc-util.h"
7	#include "errno-util.h"
8	#include "fd-util.h"
9	#include "format-util.h"
10	#include "hash-funcs.h"
11	#include "log.h"
12	#include "parse-util.h"
13	#include "pidfd-util.h"
14	#include "pidref.h"
15	#include "process-util.h"
16	#include "siphash24.h"
17
18	int pidref_acquire_pidfd_id(PidRef *pidref) {	12,915✔
19	int r;	12,915✔
20
21	assert(pidref);	12,915✔
22
23	if (!pidref_is_set(pidref))	12,915✔
24	return -ESRCH;
25
26	if (pidref_is_remote(pidref))	12,915✔
27	return -EREMOTE;
28
29	if (pidref->fd < 0)	12,915✔
30	return -ENOMEDIUM;
31
32	if (pidref->fd_id > 0)	12,908✔
33	return 0;
34
35	r = pidfd_get_inode_id(pidref->fd, &pidref->fd_id);	6,202✔
36	if (r < 0) {	6,202✔
37	if (!ERRNO_IS_NEG_NOT_SUPPORTED(r))	×
38	log_debug_errno(r, "Failed to get inode number of pidfd for pid " PID_FMT ": %m",	×
39	pidref->pid);
40	return r;	×
41	}
42
43	return 0;
44	}
45
46	bool pidref_equal(PidRef a, PidRef b) {	7,562✔
47
48	/* If this is the very same structure, it definitely refers to the same process */
49	if (a == b)	7,562✔
50	return true;
51
52	if (!pidref_is_set(a))	7,559✔
53	return !pidref_is_set(b);	3,223✔
54
55	if (!pidref_is_set(b))	4,336✔
56	return false;
57
58	if (a->pid != b->pid)	4,326✔
59	return false;
60
61	if (pidref_is_remote(a)) {	4,186✔
62	/* If one is remote and the other isn't, they are not the same */
63	if (!pidref_is_remote(b))	×
64	return false;
65
66	/* If both are remote, compare fd IDs if we have both, otherwise don't bother, and cut things short */
67	if (a->fd_id == 0 \|\| b->fd_id == 0)	×
68	return true;
69	} else {
70	/* If the other side is remote, then this is not the same */
71	if (pidref_is_remote(b))	4,186✔
72	return false;
73
74	/* PID1 cannot exit, hence it cannot change pidfs ids, hence no point in comparing them, we
75	* can shortcut things */
76	if (a->pid == 1)	4,185✔
77	return true;
78
79	/* Try to compare pidfds using their inode numbers. This way we can ensure that we
80	* don't spuriously consider two PidRefs equal if the pid has been reused once. Note
81	* that we ignore all errors here, not only EOPNOTSUPP, as fstat() might fail due to
82	* many reasons. */
83	if (pidref_acquire_pidfd_id(a) < 0 \|\| pidref_acquire_pidfd_id(b) < 0)	4,179✔
84	return true;	2✔
85	}
86
87	return a->fd_id == b->fd_id;	4,177✔
88	}
89
90	int pidref_set_pid(PidRef *pidref, pid_t pid) {	52,067✔
91	uint64_t pidfdid = 0;	52,067✔
92	int fd;	52,067✔
93
94	assert(pidref);	52,067✔
95
96	if (pid < 0)	52,067✔
97	return -ESRCH;	52,067✔
98	if (pid == 0) {	52,067✔
99	pid = getpid_cached();	27,482✔
100	(void) pidfd_get_inode_id_self_cached(&pidfdid);	27,482✔
101	}
102
103	fd = pidfd_open(pid, 0);	52,067✔
104	if (fd < 0) {	52,067✔
105	/* Graceful fallback in case the kernel is out of fds */
106	if (!ERRNO_IS_RESOURCE(errno))	×
107	return log_debug_errno(errno, "Failed to open pidfd for pid " PID_FMT ": %m", pid);	×
108
109	fd = -EBADF;
110	}
111
112	*pidref = (PidRef) {	52,067✔
113	.fd = fd,
114	.pid = pid,
115	.fd_id = pidfdid,
116	};
117
118	return 0;	52,067✔
119	}
120
121	int pidref_set_pid_and_pidfd_id(	56✔
122	PidRef *pidref,
123	pid_t pid,
124	uint64_t pidfd_id) {
125
126	int r;	56✔
127
128	assert(pidref);	56✔
129
130	_cleanup_(pidref_done) PidRef n = PIDREF_NULL;	×
131	r = pidref_set_pid(&n, pid);	56✔
132	if (r < 0)	56✔
133	return r;
134
135	if (pidfd_id > 0) {	56✔
136	r = pidref_acquire_pidfd_id(&n);	56✔
137	if (r < 0 && !ERRNO_IS_NEG_NOT_SUPPORTED(r))	112✔
138	return r;
139
140	if (n.fd_id != pidfd_id)	56✔
141	return -ESRCH;
142	}
143
144	*pidref = TAKE_PIDREF(n);	56✔
145	return 0;	56✔
146	}
147
148	int pidref_set_pidstr(PidRef pidref, const char pid) {	43✔
149	pid_t nr;	43✔
150	int r;	43✔
151
152	assert(pidref);	43✔
153
154	r = parse_pid(pid, &nr);	43✔
155	if (r < 0)	43✔
156	return r;	43✔
157
158	return pidref_set_pid(pidref, nr);	43✔
159	}
160
161	int pidref_set_pidfd(PidRef *pidref, int fd) {	1,081✔
162	int r;	1,081✔
163
164	assert(pidref);	1,081✔
165
166	if (fd < 0)	1,081✔
167	return -EBADF;
168
169	int fd_copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);	1,081✔
170	if (fd_copy < 0) {	1,081✔
171	pid_t pid;	×
172
173	if (!ERRNO_IS_RESOURCE(errno))	×
174	return -errno;	×
175
176	/* Graceful fallback if we are out of fds */
177	r = pidfd_get_pid(fd, &pid);	×
178	if (r < 0)	×
179	return r;
180
181	*pidref = PIDREF_MAKE_FROM_PID(pid);	×
182	return 0;	×
183	}
184
185	return pidref_set_pidfd_consume(pidref, fd_copy);	1,081✔
186	}
187
188	int pidref_set_pidfd_take(PidRef *pidref, int fd) {	3,687✔
189	pid_t pid;	3,687✔
190	int r;	3,687✔
191
192	assert(pidref);	3,687✔
193
194	if (fd < 0)	3,687✔
195	return -EBADF;	3,687✔
196
197	r = pidfd_get_pid(fd, &pid);	3,687✔
198	if (r < 0)	3,687✔
199	return r;
200
201	*pidref = (PidRef) {	3,687✔
202	.fd = fd,
203	.pid = pid,
204	};
205
206	return 0;	3,687✔
207	}
208
209	int pidref_set_pidfd_consume(PidRef *pidref, int fd) {	3,685✔
210	int r;	3,685✔
211
212	r = pidref_set_pidfd_take(pidref, fd);	3,685✔
213	if (r < 0)	3,685✔
214	safe_close(fd);	×
215
216	return r;	3,685✔
217	}
218
219	int pidref_set_parent(PidRef *ret) {	1,241✔
220	_cleanup_(pidref_done) PidRef parent = PIDREF_NULL;	1,241✔
221	pid_t ppid;	1,241✔
222	int r;	1,241✔
223
224	assert(ret);	1,241✔
225
226	/* Acquires a pidref to our parent process. Deals with the fact that parent processes might exit, and
227	* we get reparented to other processes, with our old parent's PID already being recycled. */
228
229	ppid = getppid();	1,241✔
230	for (;;) {	1,241✔
231	r = pidref_set_pid(&parent, ppid);	1,241✔
232	if (r < 0)	1,241✔
233	return r;
234
235	if (parent.fd < 0) /* If pidfds are not available, then we are done */	1,241✔
236	break;
237
238	pid_t now_ppid = getppid();	1,241✔
239	if (now_ppid == ppid) /* If our ppid is still the same, then we are done */	1,241✔
240	break;
241
242	/* Otherwise let's try again with the new ppid */
243	ppid = now_ppid;	×
244	pidref_done(&parent);	×
245	}
246
247	*ret = TAKE_PIDREF(parent);	1,241✔
248	return 0;	1,241✔
249	}
250
251	void pidref_done(PidRef *pidref) {	215,979✔
252	assert(pidref);	215,979✔
253
254	*pidref = (PidRef) {	431,958✔
255	.fd = safe_close(pidref->fd),	215,979✔
256	};
257	}	215,979✔
258
259	PidRef* pidref_free(PidRef *pidref) {	3,277✔
260	/* Regularly, this is an embedded structure. But sometimes we want it on the heap too */
261	if (!pidref)	3,277✔
262	return NULL;
263
264	pidref_done(pidref);	3,277✔
265	return mfree(pidref);	3,277✔
266	}
267
268	int pidref_copy(const PidRef pidref, PidRef ret) {	3,278✔
269	_cleanup_(pidref_done) PidRef copy = PIDREF_NULL;	3,278✔
270
271	/* If NULL is passed we'll generate a PidRef that refers to no process. This makes it easy to
272	* copy pidref fields that might or might not reference a process yet. */
273
274	assert(ret);	3,278✔
275
276	if (pidref) {	3,278✔
277	if (pidref_is_remote(pidref)) /* Propagate remote flag */	3,276✔
278	copy.fd = -EREMOTE;	×
279	else if (pidref->fd >= 0) {	3,276✔
280	copy.fd = fcntl(pidref->fd, F_DUPFD_CLOEXEC, 3);	3,270✔
281	if (copy.fd < 0) {	3,270✔
282	if (!ERRNO_IS_RESOURCE(errno))	×
283	return -errno;	×
284
285	copy.fd = -EBADF;	×
286	}
287	}
288
289	copy.pid = pidref->pid;	3,276✔
290	copy.fd_id = pidref->fd_id;	3,276✔
291	}
292
293	*ret = TAKE_PIDREF(copy);	3,278✔
294	return 0;	3,278✔
295	}
296
297	int pidref_dup(const PidRef pidref, PidRef *ret) {	3,274✔
298	_cleanup_(pidref_freep) PidRef *dup_pidref = NULL;	3,274✔
299	int r;	3,274✔
300
301	/* Allocates a new PidRef on the heap, making it a copy of the specified pidref. This does not try to
302	* acquire a pidfd if we don't have one yet! */
303
304	assert(ret);	3,274✔
305
306	dup_pidref = newdup(PidRef, &PIDREF_NULL, 1);	3,274✔
307	if (!dup_pidref)	3,274✔
308	return -ENOMEM;
309
310	r = pidref_copy(pidref, dup_pidref);	3,274✔
311	if (r < 0)	3,274✔
312	return r;
313
314	*ret = TAKE_PTR(dup_pidref);	3,274✔
315	return 0;	3,274✔
316	}
317
318	int pidref_new_from_pid(pid_t pid, PidRef **ret) {	4✔
319	_cleanup_(pidref_freep) PidRef *n = NULL;	4✔
320	int r;	4✔
321
322	assert(ret);	4✔
323
324	if (pid < 0)	4✔
325	return -ESRCH;
326
327	n = new(PidRef, 1);	3✔
328	if (!n)	3✔
329	return -ENOMEM;
330
331	*n = PIDREF_NULL;	3✔
332
333	r = pidref_set_pid(n, pid);	3✔
334	if (r < 0)	3✔
335	return r;
336
337	*ret = TAKE_PTR(n);	3✔
338	return 0;	3✔
339	}
340
341	int pidref_kill(const PidRef *pidref, int sig) {	15,711✔
342
343	if (!pidref)	15,711✔
344	return -ESRCH;
345
346	if (pidref_is_remote(pidref))	15,711✔
347	return -EREMOTE;
348
349	if (pidref->fd >= 0)	15,709✔
350	return RET_NERRNO(pidfd_send_signal(pidref->fd, sig, NULL, 0));	7,014✔
351
352	if (pidref->pid > 0)	8,695✔
353	return RET_NERRNO(kill(pidref->pid, sig));	15,761✔
354
355	return -ESRCH;
356	}
357
358	int pidref_kill_and_sigcont(const PidRef *pidref, int sig) {	431✔
359	int r;	431✔
360
361	r = pidref_kill(pidref, sig);	431✔
362	if (r < 0)	431✔
363	return r;
364
365	if (!IN_SET(sig, SIGCONT, SIGKILL))	430✔
366	(void) pidref_kill(pidref, SIGCONT);	430✔
367
368	return 0;
369	}
370
371	int pidref_sigqueue(const PidRef *pidref, int sig, int value) {	10,222✔
372
373	if (!pidref)	10,222✔
374	return -ESRCH;
375
376	if (pidref_is_remote(pidref))	10,222✔
377	return -EREMOTE;
378
379	if (pidref->fd >= 0) {	10,222✔
380	siginfo_t si;	10,222✔
381
382	/* We can't use structured initialization here, since the structure contains various unions
383	* and these fields lie in overlapping (carefully aligned) unions that LLVM is allergic to
384	* allow assignments to */
385	zero(si);	10,222✔
386	si.si_signo = sig;	10,222✔
387	si.si_code = SI_QUEUE;	10,222✔
388	si.si_pid = getpid_cached();	10,222✔
389	si.si_uid = getuid();	10,222✔
390	si.si_value.sival_int = value;	10,222✔
391
392	return RET_NERRNO(pidfd_send_signal(pidref->fd, sig, &si, 0));	10,222✔
393	}
394
395	if (pidref->pid > 0)	×
396	return RET_NERRNO(sigqueue(pidref->pid, sig, (const union sigval) { .sival_int = value }));	×
397
398	return -ESRCH;
399	}
400
401	int pidref_verify(const PidRef *pidref) {	46,511✔
402	int r;	46,511✔
403
404	/* This is a helper that is supposed to be called after reading information from procfs via a
405	* PidRef. It ensures that the PID we track still matches the PIDFD we pin. If this value differs
406	* after a procfs read, we might have read the data from a recycled PID. */
407
408	if (!pidref_is_set(pidref))	46,511✔
409	return -ESRCH;
410
411	if (pidref_is_remote(pidref))	46,509✔
412	return -EREMOTE;
413
414	if (pidref->pid == 1)	46,508✔
415	return 1; /* PID 1 can never go away, hence never be recycled to a different process → return 1 */
416
417	if (pidref->fd < 0)	45,003✔
418	return 0; /* If we don't have a pidfd we cannot validate it, hence we assume it's all OK → return 0 */
419
420	r = pidfd_verify_pid(pidref->fd, pidref->pid);	23,414✔
421	if (r < 0)	23,414✔
422	return r;	2,875✔
423
424	return 1; /* We have a pidfd and it still points to the PID we have, hence all is really OK → return 1 */
425	}
426
427	bool pidref_is_self(PidRef *pidref) {	34,004✔
428	if (!pidref_is_set(pidref))	34,004✔
429	return false;	34,004✔
430
431	if (pidref_is_remote(pidref))	34,002✔
432	return false;
433
434	if (pidref->pid != getpid_cached())	34,002✔
435	return false;
436
437	/* PID1 cannot exit, hence no point in comparing pidfd IDs, they can never change */
438	if (pidref->pid == 1)	694✔
439	return true;
440
441	/* Also compare pidfd ID if we can get it */
442	if (pidref_acquire_pidfd_id(pidref) < 0)	694✔
443	return true;
444
445	uint64_t self_id;	689✔
446	if (pidfd_get_inode_id_self_cached(&self_id) < 0)	689✔
447	return true;
448
449	return pidref->fd_id == self_id;	689✔
450	}
451
452	int pidref_wait(PidRef pidref, siginfo_t ret, int options) {	10,840✔
453	int r;	10,840✔
454
455	if (!pidref_is_set(pidref))	10,840✔
456	return -ESRCH;	10,840✔
457
458	if (pidref_is_remote(pidref))	10,840✔
459	return -EREMOTE;
460
461	if (pidref->pid == 1 \|\| pidref_is_self(pidref))	10,839✔
462	return -ECHILD;	×
463
464	siginfo_t si = {};	10,839✔
465	if (pidref->fd >= 0)	10,839✔
466	r = RET_NERRNO(waitid(P_PIDFD, pidref->fd, &si, options));	4,653✔
467	else
468	r = RET_NERRNO(waitid(P_PID, pidref->pid, &si, options));	6,186✔
469	if (r < 0)	×
470	return r;
471
472	if (ret)	10,839✔
473	*ret = si;	7,440✔
474
475	return 0;
476	}
477
478	int pidref_wait_for_terminate(PidRef pidref, siginfo_t ret) {	10,840✔
479	int r;	10,840✔
480
481	for (;;) {	10,840✔
482	r = pidref_wait(pidref, ret, WEXITED);	10,840✔
483	if (r != -EINTR)	10,840✔
484	return r;	10,840✔
485	}
486	}
487
488	bool pidref_is_automatic(const PidRef *pidref) {	184,992✔
489	return pidref && pid_is_automatic(pidref->pid);	184,992✔
490	}
491
492	void pidref_hash_func(const PidRef pidref, struct siphash state) {	92,022✔
493	siphash24_compress_typesafe(pidref->pid, state);	92,022✔
494	}	92,022✔
495
496	int pidref_compare_func(const PidRef a, const PidRef b) {	92,470✔
497	int r;	92,470✔
498
499	assert(a);	92,470✔
500	assert(b);	92,470✔
501
502	r = CMP(pidref_is_set(a), pidref_is_set(b));	277,410✔
503	if (r != 0)	92,470✔
504	return r;	×
505
506	r = CMP(pidref_is_automatic(a), pidref_is_automatic(b));	92,470✔
507	if (r != 0)	92,470✔
508	return r;	×
509
510	r = CMP(pidref_is_remote(a), pidref_is_remote(b));	184,940✔
511	if (r != 0)	92,470✔
512	return r;	×
513
514	r = CMP(a->pid, b->pid);	92,470✔
515	if (r != 0)	73,413✔
516	return r;	21,695✔
517
518	if (a->fd_id != 0 && b->fd_id != 0)	70,775✔
519	return CMP(a->fd_id, b->fd_id);	661✔
520
521	return 0;
522	}
523
524	DEFINE_HASH_OPS(pidref_hash_ops, PidRef, pidref_hash_func, pidref_compare_func);
525
526	DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(pidref_hash_ops_free,	×
527	PidRef, pidref_hash_func, pidref_compare_func,
528	pidref_free);

systemd / systemd / 20355307520

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