opendir - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEopendir, fdopendir − open a directory

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LIBRARYStandard C library (libc, −lc)

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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

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DESCRIPTIONThe 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.

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RETURN VALUEThe opendir() and fdopendir() functions return a pointer to the directory stream. On error, NULL is returned, and errno is set to indicate the error.

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ERRORSEACCES  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.

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VERSIONSfdopendir() is available since glibc 2.4.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue opendir(), fdopendir() Thread safetyMT-Safe

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

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NOTESFilename 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.

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SEE ALSOopen(2), closedir(3), dirfd(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3) 0

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