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getaliasent (3)
  • >> getaliasent (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

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

    SYNOPSIS

    #include <aliases.h>

    void setaliasent(void);

    void endaliasent(void);

    struct aliasent *getaliasent(void);

    int getaliasent_r(struct aliasent *result,
    char *buffer, size_t buflen, struct aliasent **res);

    struct aliasent *getaliasbyname(const char *name);

    int getaliasbyname_r(const char *name, struct aliasent *result,
    char *buffer, size_t buflen, struct aliasent **res);  

    DESCRIPTION

    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;
    };
    
     

    RETURN VALUE

    The functions getaliasent_r() and getaliasbyname_r() return a non-zero value on error.  

    FILES

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

    CONFORMING TO

    These routines are glibc-specific. The NeXT 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);
    
     

    EXAMPLE

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

    #include <aliases.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <errno.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);
    }
    
     

    SEE ALSO

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

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    FILES
    CONFORMING TO
    EXAMPLE
    SEE ALSO
    COLOPHON


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