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_exit(2) | System Calls Manual | _exit(2) |
JMÉNO¶
_exit, _Exit - ukonči právě probíhající proces
KNIHOVNA¶
Standardní knihovna C (libc, -lc)
POUŽITͶ
#include <unistd.h>
[[noreturn]] void _exit(int status);
#include <stdlib.h>
[[noreturn]] void _Exit(int status);
_Exit():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
POPIS¶
_exit() terminates the calling process "immediately". Any open file descriptors belonging to the process are closed. Any children of the process are inherited by init(1) (or by the nearest "subreaper" process as defined through the use of the prctl(2) PR_SET_CHILD_SUBREAPER operation). The process's parent is sent a SIGCHLD signal.
The value status & 0xFF is returned to the parent process as the process's exit status, and can be collected by the parent using one of the wait(2) family of calls.
Funkce _Exit() je shodná s funkcí _exit().
NÁVRATOVÉ HODNOTY¶
Funkce nic nevrací.
STANDARDY¶
- _exit()
- POSIX.1-2008.
- _Exit()
- C11, POSIX.1-2008.
HISTORIE¶
POSIX.1-2001, SVr4, 4.3BSD.
_Exit() was introduced by C99.
POZNÁMKY¶
Pro další informace o efektech funkce exit, jako například přenos návratového stavu, zombie procesy, zasílání signálů, viz. exit(3).
The function _exit() is like exit(3), but does not call any functions registered with atexit(3) or on_exit(3). Open stdio(3) streams are not flushed. On the other hand, _exit() does close open file descriptors, and this may cause an unknown delay, waiting for pending output to finish. If the delay is undesired, it may be useful to call functions like tcflush(3) before calling _exit(). Whether any pending I/O is canceled, and which pending I/O may be canceled upon _exit(), is implementation-dependent.
knihovna C/jaderné rozdíly¶
The text above in DESCRIPTION describes the traditional effect of _exit(), which is to terminate a process, and these are the semantics specified by POSIX.1 and implemented by the C library wrapper function. On modern systems, this means termination of all threads in the process.
By contrast with the C library wrapper function, the raw Linux _exit() system call terminates only the calling thread, and actions such as reparenting child processes or sending SIGCHLD to the parent process are performed only if this is the last thread in the thread group.
Up to glibc 2.3, the _exit() wrapper function invoked the kernel system call of the same name. Since glibc 2.3, the wrapper function invokes exit_group(2), in order to terminate all of the threads in a process.
DALŠÍ INFORMACE¶
execve(2), exit_group(2), fork(2), kill(2), wait(2), wait4(2), waitpid(2), atexit(3), exit(3), on_exit(3), termios(3)
PŘEKLAD¶
Překlad této příručky do češtiny vytvořili Pavel Heimlich <tropikhajma@gmail.com>
Tento překlad je bezplatná dokumentace; Přečtěte si GNU General Public License Version 3 nebo novější ohledně podmínek autorských práv. Neexistuje ŽÁDNÁ ODPOVĚDNOST.
Pokud narazíte na nějaké chyby v překladu této příručky, pošlete e-mail na adresu translation-team-cs@lists.sourceforge.net.
2. května 2024 | Linux man-pages 6.9.1 |