206 lines
6.9 KiB
C
206 lines
6.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <alloca.h>
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#include <errno.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/resource.h>
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#include <sys/types.h>
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#include "format-util.h"
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#include "ioprio.h"
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#include "macro.h"
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#include "time-util.h"
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#define procfs_file_alloca(pid, field) \
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({ \
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pid_t _pid_ = (pid); \
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const char *_r_; \
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if (_pid_ == 0) { \
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_r_ = ("/proc/self/" field); \
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} else { \
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_r_ = alloca(STRLEN("/proc/") + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
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sprintf((char*) _r_, "/proc/"PID_FMT"/" field, _pid_); \
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} \
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_r_; \
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})
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int get_process_state(pid_t pid);
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int get_process_comm(pid_t pid, char **name);
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int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
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int get_process_exe(pid_t pid, char **name);
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int get_process_uid(pid_t pid, uid_t *uid);
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int get_process_gid(pid_t pid, gid_t *gid);
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int get_process_capeff(pid_t pid, char **capeff);
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int get_process_cwd(pid_t pid, char **cwd);
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int get_process_root(pid_t pid, char **root);
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int get_process_environ(pid_t pid, char **environ);
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int get_process_ppid(pid_t pid, pid_t *ppid);
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int wait_for_terminate(pid_t pid, siginfo_t *status);
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typedef enum WaitFlags {
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WAIT_LOG_ABNORMAL = 1U << 0,
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WAIT_LOG_NON_ZERO_EXIT_STATUS = 1U << 1,
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/* A shortcut for requesting the most complete logging */
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WAIT_LOG = WAIT_LOG_ABNORMAL|WAIT_LOG_NON_ZERO_EXIT_STATUS,
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} WaitFlags;
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int wait_for_terminate_and_check(const char *name, pid_t pid, WaitFlags flags);
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int wait_for_terminate_with_timeout(pid_t pid, usec_t timeout);
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void sigkill_wait(pid_t pid);
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void sigkill_waitp(pid_t *pid);
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int kill_and_sigcont(pid_t pid, int sig);
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int rename_process(const char name[]);
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int is_kernel_thread(pid_t pid);
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int getenv_for_pid(pid_t pid, const char *field, char **_value);
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bool pid_is_alive(pid_t pid);
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bool pid_is_unwaited(pid_t pid);
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int pid_from_same_root_fs(pid_t pid);
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bool is_main_thread(void);
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noreturn void freeze(void);
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bool oom_score_adjust_is_valid(int oa);
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#ifndef PERSONALITY_INVALID
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/* personality(7) documents that 0xffffffffUL is used for querying the
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* current personality, hence let's use that here as error
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* indicator. */
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#define PERSONALITY_INVALID 0xffffffffLU
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#endif
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unsigned long personality_from_string(const char *p);
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const char *personality_to_string(unsigned long);
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int safe_personality(unsigned long p);
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int opinionated_personality(unsigned long *ret);
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int ioprio_class_to_string_alloc(int i, char **s);
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int ioprio_class_from_string(const char *s);
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const char *sigchld_code_to_string(int i) _const_;
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int sigchld_code_from_string(const char *s) _pure_;
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int sched_policy_to_string_alloc(int i, char **s);
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int sched_policy_from_string(const char *s);
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static inline pid_t PTR_TO_PID(const void *p) {
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return (pid_t) ((uintptr_t) p);
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}
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static inline void* PID_TO_PTR(pid_t pid) {
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return (void*) ((uintptr_t) pid);
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}
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void valgrind_summary_hack(void);
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int pid_compare_func(const void *a, const void *b);
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static inline bool nice_is_valid(int n) {
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return n >= PRIO_MIN && n < PRIO_MAX;
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}
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static inline bool sched_policy_is_valid(int i) {
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return IN_SET(i, SCHED_OTHER, SCHED_BATCH, SCHED_IDLE, SCHED_FIFO, SCHED_RR);
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}
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static inline bool sched_priority_is_valid(int i) {
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return i >= 0 && i <= sched_get_priority_max(SCHED_RR);
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}
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static inline bool ioprio_class_is_valid(int i) {
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return IN_SET(i, IOPRIO_CLASS_NONE, IOPRIO_CLASS_RT, IOPRIO_CLASS_BE, IOPRIO_CLASS_IDLE);
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}
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static inline bool ioprio_priority_is_valid(int i) {
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return i >= 0 && i < IOPRIO_BE_NR;
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}
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static inline bool pid_is_valid(pid_t p) {
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return p > 0;
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}
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static inline int sched_policy_to_string_alloc_with_check(int n, char **s) {
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if (!sched_policy_is_valid(n))
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return -EINVAL;
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return sched_policy_to_string_alloc(n, s);
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}
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int ioprio_parse_priority(const char *s, int *ret);
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pid_t getpid_cached(void);
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void reset_cached_pid(void);
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int must_be_root(void);
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typedef enum ForkFlags {
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FORK_RESET_SIGNALS = 1U << 0,
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FORK_CLOSE_ALL_FDS = 1U << 1,
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FORK_DEATHSIG = 1U << 2,
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FORK_NULL_STDIO = 1U << 3,
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FORK_REOPEN_LOG = 1U << 4,
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FORK_LOG = 1U << 5,
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FORK_WAIT = 1U << 6,
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FORK_NEW_MOUNTNS = 1U << 7,
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} ForkFlags;
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int safe_fork_full(const char *name, const int except_fds[], size_t n_except_fds, ForkFlags flags, pid_t *ret_pid);
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static inline int safe_fork(const char *name, ForkFlags flags, pid_t *ret_pid) {
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return safe_fork_full(name, NULL, 0, flags, ret_pid);
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}
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int fork_agent(const char *name, const int except[], unsigned n_except, pid_t *pid, const char *path, ...);
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#if SIZEOF_PID_T == 4
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/* The highest possibly (theoretic) pid_t value on this architecture. */
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#define PID_T_MAX ((pid_t) INT32_MAX)
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/* The maximum number of concurrent processes Linux allows on this architecture, as well as the highest valid PID value
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* the kernel will potentially assign. This reflects a value compiled into the kernel (PID_MAX_LIMIT), and sets the
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* upper boundary on what may be written to the /proc/sys/kernel/pid_max sysctl (but do note that the sysctl is off by
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* 1, since PID 0 can never exist and there can hence only be one process less than the limit would suggest). Since
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* these values are documented in proc(5) we feel quite confident that they are stable enough for the near future at
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* least to define them here too. */
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#define TASKS_MAX 4194303U
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#elif SIZEOF_PID_T == 2
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#define PID_T_MAX ((pid_t) INT16_MAX)
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#define TASKS_MAX 32767U
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#else
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#error "Unknown pid_t size"
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#endif
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assert_cc(TASKS_MAX <= (unsigned long) PID_T_MAX)
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