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man:opendir

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

NAME

     opendir, fdopendir - open a directory

SYNOPSIS

     #include <sys/types.h>
     #include <dirent.h>
     DIR *opendir(const char *name);
     DIR *fdopendir(int fd);
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     fdopendir():
         Since glibc 2.10:
             _POSIX_C_SOURCE >= 200809L
         Before glibc 2.10:
             _GNU_SOURCE

DESCRIPTION

     The  opendir()  function  opens a directory stream corresponding to the
     directory name, and returns a pointer to  the  directory  stream.   The
     stream is positioned at the first entry in the directory.
     The  fdopendir()  function  is  like opendir(), but returns a directory
     stream for the directory referred to by the open  file  descriptor  fd.
     After  a  successful  call to fdopendir(), fd is used internally by the
     implementation, and should not otherwise be used by the application.

RETURN VALUE

     The opendir() and fdopendir() functions return a pointer to the  direc-
     tory  stream.   On  error, NULL is returned, and errno is set appropri-
     ately.

ERRORS

     EACCES Permission denied.
     EBADF  fd is not a valid file descriptor opened for reading.
     EMFILE The per-process limit on the number of open file descriptors has
            been reached.
     ENFILE The system-wide limit on the total number of open files has been
            reached.
     ENOENT Directory does not exist, or name is an empty string.
     ENOMEM Insufficient memory to complete the operation.
     ENOTDIR
            name is not a directory.

VERSIONS

     fdopendir() is available in glibc since version 2.4.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     +-----------------------+---------------+---------+
     |Interface              | Attribute     | Value   |
     +-----------------------+---------------+---------+
     |opendir(), fdopendir() | Thread safety | MT-Safe |
     +-----------------------+---------------+---------+

CONFORMING TO

     opendir() is present on SVr4, 4.3BSD, and  specified  in  POSIX.1-2001.
     fdopendir() is specified in POSIX.1-2008.

NOTES

     Filename  entries can be read from a directory stream using readdir(3).
     The underlying file descriptor of the directory stream can be  obtained
     using dirfd(3).
     The  opendir()  function  sets  the  close-on-exec  flag  for  the file
     descriptor underlying the DIR *.  The fdopendir() function  leaves  the
     setting  of  the  close-on-exec flag unchanged for the file descriptor,
     fd.  POSIX.1-200x leaves it unspecified whether a  successful  call  to
     fdopendir()  will  set  the close-on-exec flag for the file descriptor,
     fd.

SEE ALSO

     open(2), closedir(3), dirfd(3), readdir(3),  rewinddir(3),  scandir(3),
     seekdir(3), telldir(3)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.

GNU 2017-09-15 OPENDIR(3)

/data/webs/external/dokuwiki/data/pages/man/opendir.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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