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GETPWENT(3)                Linux Programmer's Manual               GETPWENT(3)



NAME
       getpwent, setpwent, endpwent - get password file entry

SYNOPSIS
       #include <sys/types.h>
       #include <pwd.h>

       struct passwd *getpwent(void);

       void setpwent(void);

       void endpwent(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getpwent(), setpwent(), endpwent(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >
       = 500

DESCRIPTION
       The getpwent() function returns a pointer to a structure containing the  broken-out
       fields  of  a  record  from  the  password  database (e.g., the local password file
       /etc/passwd, NIS, and LDAP).  The first time it is  called  it  returns  the  first
       entry; thereafter, it returns successive entries.

       The setpwent() function rewinds to the beginning of the password database.

       The endpwent() function is used to close the password database after all processing
       has been performed.

       The passwd structure is defined in <pwd.h> as follows:

           struct passwd {
               char   *pw_name;       /* username */
               char   *pw_passwd;     /* user password */
               uid_t   pw_uid;        /* user ID */
               gid_t   pw_gid;        /* group ID */
               char   *pw_gecos;      /* real name */
               char   *pw_dir;        /* home directory */
               char   *pw_shell;      /* shell program */
           };

RETURN VALUE
       The getpwent() function returns a pointer to a passwd structure, or NULL  if  there
       are no more entries or an error occurs.  If an error occurs, errno is set appropri-
       ately.  If one wants to check errno after the call, it should be set to zero before
       the call.

       The  return  value may point to a static area, and may be overwritten by subsequent
       calls to getpwent(), getpwnam(3),  or  getpwuid(3).   (Do  not  pass  the  returned
       pointer to free(3).)

ERRORS
       EINTR  A signal was caught.

       EIO    I/O error.

       EMFILE The  maximum number (OPEN_MAX) of files was open already in the calling pro-
              cess.

       ENFILE The maximum number of files was open already in the system.

       ENOMEM Insufficient memory to allocate passwd structure.

       ERANGE Insufficient buffer space supplied.

FILES
       /etc/passwd
              local password database file

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

SEE ALSO
       fgetpwent(3),  getpw(3),  getpwent_r(3),  getpwnam(3),  getpwuid(3),   putpwent(3),
       passwd(5)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2009-03-30                       GETPWENT(3)

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