setaliasent(3) — Справочная страница Linux

setaliasent(3)          Library Functions Manual          setaliasent(3)

НАЗВАНИЕ

       setaliasent, endaliasent, getaliasent, getaliasent_r,
       getaliasbyname, getaliasbyname_r - read an alias entry

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <aliases.h>

       void setaliasent(void);
       void endaliasent(void);

       struct aliasent *getaliasent(void);
       int getaliasent_r(struct aliasent *restrict result,
                            char buffer[restrict .buflen], size_t buflen,
                            struct aliasent **restrict res);

       struct aliasent *getaliasbyname(const char *name);
       int getaliasbyname_r(const char *restrict name,
                            struct aliasent *restrict result,
                            char buffer[restrict .buflen], size_t buflen,
                            struct aliasent **restrict res);

ОПИСАНИЕ

       One of the databases available with the Name Service Switch (NSS)
       is the aliases database, that contains mail aliases.  (To find
       out which databases are supported, try getent --help.)  Six
       functions are provided to access the aliases database.

       The getaliasent() function returns a pointer to a structure
       containing the group information from the aliases database.  The
       first time it is called it returns the first entry; thereafter,
       it returns successive entries.

       The setaliasent() function rewinds the file pointer to the
       beginning of the aliases database.

       The endaliasent() function closes the aliases database.

       getaliasent_r() is the reentrant version of the previous
       function.  The requested structure is stored via the first
       argument but the programmer needs to fill the other arguments
       also.  Not providing enough space causes the function to fail.

       The function getaliasbyname() takes the name argument and
       searches the aliases database.  The entry is returned as a
       pointer to a struct aliasent.

       getaliasbyname_r() is the reentrant version of the previous
       function.  The requested structure is stored via the second
       argument but the programmer needs to fill the other arguments
       also.  Not providing enough space causes the function to fail.

       The struct aliasent is defined in <aliases.h>:

           struct aliasent {
               char    *alias_name;             /* alias name */
               size_t   alias_members_len;
               char   **alias_members;          /* alias name list */
               int      alias_local;
           };

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       The functions getaliasent_r() and getaliasbyname_r() return a
       nonzero value on error.

ФАЙЛЫ

       The default alias database is the file /etc/aliases.  This can be
       changed in the /etc/nsswitch.conf file.

АТТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────┬───────────────┬────────────────┐
       │ Interface                    │ Attribute     │ Value          │
       ├──────────────────────────────┼───────────────┼────────────────┤
       │ setaliasent(),               │ Thread safety │ MT-Safe locale │
       │ endaliasent(),               │               │                │
       │ getaliasent_r(),             │               │                │
       │ getaliasbyname_r()           │               │                │
       ├──────────────────────────────┼───────────────┼────────────────┤
       │ getaliasent(),               │ Thread safety │ MT-Unsafe      │
       │ getaliasbyname()             │               │                │
       └──────────────────────────────┴───────────────┴────────────────┘

СТАНДАРТЫ

       GNU.

ИСТОРИЯ

       The NeXT system has similar routines:

           #include <aliasdb.h>

           void alias_setent(void);
           void alias_endent(void);
           alias_ent *alias_getent(void);
           alias_ent *alias_getbyname(char *name);

ПРИМЕРЫ

       The following example compiles with gcc example.c -o example.  It
       will dump all names in the alias database.

       #include <aliases.h>
       #include <errno.h>
       #include <stdio.h>
       #include <stdlib.h>

       int
       main(void)
       {
           struct aliasent *al;

           setaliasent();
           for (;;) {
               al = getaliasent();
               if (al == NULL)
                   break;
               printf("Name: %s\n", al->alias_name);
           }
           if (errno) {
               perror("reading alias");
               exit(EXIT_FAILURE);
           }
           endaliasent();
           exit(EXIT_SUCCESS);
       }

СМОТРИТЕ ТАКЖЕ

       getgrent(3), getpwent(3), getspent(3), aliases(5)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
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       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-06-15                 setaliasent(3)

Страницы, которые ссылаются на эту страницу: getent(1), nsswitch.conf(5)