atexit(3)                  Library Functions Manual                  atexit(3)

JMENO
       atexit - registruje funkci, ktera se ma vyvolat pri ukonceni procesu

KNIHOVNA
       Standardni knihovna C (libc, -lc)

POUZITI
       #include <stdlib.h>

       int atexit(void (*function)(void));

POPIS
       Funkce atexit() zaradi function do seznamu funkci, ktere jsou vyvolany
       pri normalnim ukonceni programu, at uz funkci exit(3)  nebo navratem z
       funkce main.  Funkce takto registrovane jsou volany v obracenem poradi
       jejich registrace; nejsou jim poskytnuty zadne argumenty.

       The same function may be registered multiple times: it is called once
       for each registration.

       POSIX.1 vyzaduje, aby implementace dovolovala minimalne ATEXIT_MAX(32)
       registraci takovychto funkci. Skutecny pocet moznych registraci
       podporovanych v dane implementaci je mozne zjistit pomoci sysconf(3).

       Pri vytvoreni procesu pomoci fork(2), zdedi potomek registrace svych
       rodicu.  Pri uspesnem volani funkce exec(3), jsou vsechny registrace
       odstraneny.

NAVRATOVE HODNOTY
       Funkce atexit() vraci hodnotu 0, byla-li uspesna, jinak je vracena
       nenulova hodnota.

ATRIBUTY
       Vysvetleni pojmu pouzitych v teto casti viz attributes(7).

       +--------------------------------------------+---------------+---------+
       |Rozhrani                                    | Atribut       | Hodnota |
       +--------------------------------------------+---------------+---------+
       |atexit()                                    | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
VERZE
       POSIX.1 says that the result of calling exit(3)  more than once (i.e.,
       calling exit(3)  within a function registered using atexit())  is
       undefined.  On some systems (but not Linux), this can result in an
       infinite recursion; portable programs should not invoke exit(3)  inside
       a function registered using atexit().

STANDARDY
       C11, POSIX.1-2008.

HISTORIE
       POSIX.1-2001, C89, C99, SVr4, 4.3BSD.

POZNAMKY
       Funkce registrovane pomoci atexit() (a on_exit(3)) nejsou volany, pokud
       je proces abnormalne ukoncen, napriklad kvuli doruceni signalu.

       If one of the registered functions calls _exit(2), then any remaining
       functions are not invoked, and the other process termination steps
       performed by exit(3)  are not performed.

       The atexit()  and on_exit(3)  functions register functions on the same
       list: at normal process termination, the registered functions are
       invoked in reverse order of their registration by these two functions.

       According to POSIX.1, the result is undefined if longjmp(3)  is used to
       terminate execution of one of the functions registered using atexit().

   Linuxova poznamka
       Od verze glibc 2.2.3, mohou byt atexit() (a on_exit(3)) pouzity uvnitr
       sdilenych knihoven, aby spoustely funkce, ktere jsou volany, je-li
       knihovna uvolnena z pameti.

PRIKLADY
       #include <stdio.h>
       #include <stdlib.h>
       #include <unistd.h>

       void
       bye(void)
       {
           printf("That was all, folks\n");
       }

       int
       main(void)
       {
           long a;
           int i;

           a = sysconf(_SC_ATEXIT_MAX);
           printf("ATEXIT_MAX = %ld\n", a);

           i = atexit(bye);
           if (i != 0) {
               fprintf(stderr, "cannot set exit function\n");
               exit(EXIT_FAILURE);
           }

           exit(EXIT_SUCCESS);
       }

DALSI INFORMACE
       _exit(2), dlopen(3), exit(3), on_exit(3)

PREKLAD
       Preklad teto prirucky do spanelstiny vytvorili Pavel Heimlich
       <tropikhajma@gmail.com>

       Tento preklad je bezplatna dokumentace; Prectete si GNU General Public
       License Version 3 <https://www.gnu.org/licenses/gpl-3.0.html> nebo
       novejsi ohledne podminek autorskych prav. Neexistuje ZADNA ODPOVEDNOST.

       Pokud narazite na nejake chyby v prekladu teto prirucky, poslete e-mail
       na adresu <translation-team-cs@lists.sourceforge.net>.

Linux man-pages 6.06           31. rijna 2023                        atexit(3)