1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2010 Lennart Poettering
18 #include <sys/resource.h>
19 #include <sys/types.h>
21 #include "format-util.h"
24 #include "time-util.h"
26 #define procfs_file_alloca(pid, field) \
28 pid_t _pid_ = (pid); \
31 _r_ = ("/proc/self/" field); \
33 _r_ = alloca(STRLEN("/proc/") + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
34 sprintf((char*) _r_, "/proc/"PID_FMT"/" field, _pid_); \
39 int get_process_state(pid_t pid);
40 int get_process_comm(pid_t pid, char **name);
41 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
42 int get_process_exe(pid_t pid, char **name);
43 #if 0 /// UNNEEDED by elogind
44 int get_process_uid(pid_t pid, uid_t *uid);
45 int get_process_gid(pid_t pid, gid_t *gid);
46 int get_process_capeff(pid_t pid, char **capeff);
47 int get_process_cwd(pid_t pid, char **cwd);
48 int get_process_root(pid_t pid, char **root);
49 int get_process_environ(pid_t pid, char **environ);
50 int get_process_ppid(pid_t pid, pid_t *ppid);
53 int wait_for_terminate(pid_t pid, siginfo_t *status);
55 typedef enum WaitFlags {
56 WAIT_LOG_ABNORMAL = 1 << 0,
57 WAIT_LOG_NON_ZERO_EXIT_STATUS = 1 << 1,
59 /* A shortcut for requesting the most complete logging */
60 WAIT_LOG = WAIT_LOG_ABNORMAL|WAIT_LOG_NON_ZERO_EXIT_STATUS,
63 int wait_for_terminate_and_check(const char *name, pid_t pid, WaitFlags flags);
64 int wait_for_terminate_with_timeout(pid_t pid, usec_t timeout);
65 #if 0 /// UNNEEDED by elogind
67 void sigkill_wait(pid_t pid);
68 void sigkill_waitp(pid_t *pid);
70 void sigterm_wait(pid_t pid);
72 int kill_and_sigcont(pid_t pid, int sig);
74 int rename_process(const char name[]);
75 int is_kernel_thread(pid_t pid);
77 int getenv_for_pid(pid_t pid, const char *field, char **_value);
79 bool pid_is_alive(pid_t pid);
80 bool pid_is_unwaited(pid_t pid);
81 #if 0 /// UNNEEDED by elogind
82 int pid_from_same_root_fs(pid_t pid);
85 bool is_main_thread(void);
87 #if 0 /// UNNEEDED by elogind
88 _noreturn_ void freeze(void);
90 bool oom_score_adjust_is_valid(int oa);
93 #ifndef PERSONALITY_INVALID
94 /* personality(7) documents that 0xffffffffUL is used for querying the
95 * current personality, hence let's use that here as error
97 #define PERSONALITY_INVALID 0xffffffffLU
100 #if 0 /// UNNEEDED by elogind
101 unsigned long personality_from_string(const char *p);
102 const char *personality_to_string(unsigned long);
104 int safe_personality(unsigned long p);
105 int opinionated_personality(unsigned long *ret);
107 int ioprio_class_to_string_alloc(int i, char **s);
108 int ioprio_class_from_string(const char *s);
110 const char *sigchld_code_to_string(int i) _const_;
111 int sigchld_code_from_string(const char *s) _pure_;
114 int sched_policy_to_string_alloc(int i, char **s);
115 #if 0 /// UNNEEDED by elogind
116 int sched_policy_from_string(const char *s);
119 static inline pid_t PTR_TO_PID(const void *p) {
120 return (pid_t) ((uintptr_t) p);
123 static inline void* PID_TO_PTR(pid_t pid) {
124 return (void*) ((uintptr_t) pid);
127 void valgrind_summary_hack(void);
129 int pid_compare_func(const void *a, const void *b);
131 #if 0 /// UNNEEDED by elogind
132 static inline bool nice_is_valid(int n) {
133 return n >= PRIO_MIN && n < PRIO_MAX;
137 static inline bool sched_policy_is_valid(int i) {
138 return IN_SET(i, SCHED_OTHER, SCHED_BATCH, SCHED_IDLE, SCHED_FIFO, SCHED_RR);
141 #if 0 /// UNNEEDED by elogind
142 static inline bool sched_priority_is_valid(int i) {
143 return i >= 0 && i <= sched_get_priority_max(SCHED_RR);
146 static inline bool ioprio_class_is_valid(int i) {
147 return IN_SET(i, IOPRIO_CLASS_NONE, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE);
150 static inline bool ioprio_priority_is_valid(int i) {
151 return i >= 0 && i < IOPRIO_BE_NR;
155 static inline bool pid_is_valid(pid_t p) {
159 static inline int sched_policy_to_string_alloc_with_check(int n, char **s) {
160 if (!sched_policy_is_valid(n))
163 return sched_policy_to_string_alloc(n, s);
166 #if 0 /// UNNEEDED by elogind
167 int ioprio_parse_priority(const char *s, int *ret);
170 pid_t getpid_cached(void);
171 void reset_cached_pid(void);
173 int must_be_root(void);
175 typedef enum ForkFlags {
176 FORK_RESET_SIGNALS = 1 << 0,
177 FORK_CLOSE_ALL_FDS = 1 << 1,
178 FORK_DEATHSIG = 1 << 2,
179 FORK_NULL_STDIO = 1 << 3,
180 FORK_REOPEN_LOG = 1 << 4,
183 FORK_NEW_MOUNTNS = 1 << 7,
184 FORK_MOUNTNS_SLAVE = 1 << 8,
187 int safe_fork_full(const char *name, const int except_fds[], size_t n_except_fds, ForkFlags flags, pid_t *ret_pid);
189 static inline int safe_fork(const char *name, ForkFlags flags, pid_t *ret_pid) {
190 return safe_fork_full(name, NULL, 0, flags, ret_pid);
193 int fork_agent(const char *name, const int except[], size_t n_except, pid_t *pid, const char *path, ...);
195 int set_oom_score_adjust(int value);
197 #if SIZEOF_PID_T == 4
198 /* The highest possibly (theoretic) pid_t value on this architecture. */
199 #define PID_T_MAX ((pid_t) INT32_MAX)
200 /* The maximum number of concurrent processes Linux allows on this architecture, as well as the highest valid PID value
201 * the kernel will potentially assign. This reflects a value compiled into the kernel (PID_MAX_LIMIT), and sets the
202 * upper boundary on what may be written to the /proc/sys/kernel/pid_max sysctl (but do note that the sysctl is off by
203 * 1, since PID 0 can never exist and there can hence only be one process less than the limit would suggest). Since
204 * these values are documented in proc(5) we feel quite confident that they are stable enough for the near future at
205 * least to define them here too. */
206 #define TASKS_MAX 4194303U
207 #elif SIZEOF_PID_T == 2
208 #define PID_T_MAX ((pid_t) INT16_MAX)
209 #define TASKS_MAX 32767U
211 #error "Unknown pid_t size"
214 assert_cc(TASKS_MAX <= (unsigned long) PID_T_MAX)
216 /* Like TAKE_PTR() but for child PIDs, resetting them to 0 */
217 #define TAKE_PID(pid) \
219 pid_t _pid_ = (pid); \