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OPENDIR(3)                 Linux Programmer's ManualOPENDIR(3)NAME       opendir, fdopendir - open a directorySYNOPSIS       #include <sys/types.h>       #include <dirent.h>       DIR *opendir(const char *name);       DIR *fdopendir(int fd);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):       fdopendir():           Since glibc 2.10:               _POSIX_C_SOURCE >= 200809L           Before glibc 2.10:               _GNU_SOURCEDESCRIPTION       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  at-tributes(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 usingreaddir(3).       The underlying file descriptor of the directory stream can be  obtained       usingdirfd(3).       The  opendir()  function  sets  the close-on-exec flag for the file de-       scriptor 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 ALSOopen(2),closedir(3),dirfd(3),readdir(3),rewinddir(3),scandir(3),seekdir(3),telldir(3)COLOPHON       This  page  is  part of release 5.05 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                               2017-09-15OPENDIR(3)