mirror of
https://github.com/morgan9e/systemd
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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "macro.h"
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/* An embeddable structure carrying a reference to a process. Supposed to be used when tracking processes continuously. */
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typedef struct PidRef {
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pid_t pid; /* always valid */
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int fd; /* only valid if pidfd are available in the kernel, and we manage to get an fd */
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} PidRef;
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#define PIDREF_NULL (const PidRef) { .fd = -EBADF }
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/* Turns a pid_t into a PidRef structure on-the-fly *without* acquiring a pidfd for it. (As opposed to
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* pidref_set_pid() which does so *with* acquiring one, see below) */
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#define PIDREF_MAKE_FROM_PID(x) (PidRef) { .pid = (x), .fd = -EBADF }
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static inline bool pidref_is_set(const PidRef *pidref) {
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return pidref && pidref->pid > 0;
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}
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static inline bool pidref_equal(const PidRef *a, const PidRef *b) {
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if (pidref_is_set(a)) {
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if (!pidref_is_set(b))
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return false;
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return a->pid == b->pid;
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}
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return !pidref_is_set(b);
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}
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/* This turns a pid_t into a PidRef structure, and acquires a pidfd for it, if possible. (As opposed to
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* PIDREF_MAKE_FROM_PID() above, which does not acquire a pidfd.) */
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int pidref_set_pid(PidRef *pidref, pid_t pid);
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int pidref_set_pidstr(PidRef *pidref, const char *pid);
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int pidref_set_pidfd(PidRef *pidref, int fd);
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int pidref_set_pidfd_take(PidRef *pidref, int fd); /* takes ownership of the passed pidfd on success*/
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int pidref_set_pidfd_consume(PidRef *pidref, int fd); /* takes ownership of the passed pidfd in both success and failure */
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static inline int pidref_set_self(PidRef *pidref) {
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return pidref_set_pid(pidref, 0);
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}
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bool pidref_is_self(const PidRef *pidref);
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void pidref_done(PidRef *pidref);
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PidRef *pidref_free(PidRef *pidref);
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DEFINE_TRIVIAL_CLEANUP_FUNC(PidRef*, pidref_free);
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int pidref_dup(const PidRef *pidref, PidRef **ret);
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int pidref_new_from_pid(pid_t pid, PidRef **ret);
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int pidref_kill(const PidRef *pidref, int sig);
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int pidref_kill_and_sigcont(const PidRef *pidref, int sig);
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int pidref_sigqueue(const PidRef *pidfref, int sig, int value);
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int pidref_verify(const PidRef *pidref);
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#define TAKE_PIDREF(p) TAKE_GENERIC((p), PidRef, PIDREF_NULL)
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extern const struct hash_ops pidref_hash_ops; /* Has destructor call for pidref_free(), i.e. expects heap allocated PidRef as keys */
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