User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |

---

   dirname.3p    ( 3 )

---

---

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

---

Имя (Name)

dirname — report the parent directory name of a file pathname

---

Синопсис (Synopsis)

#include <libgen.h>

       char *dirname(char *path);

---

Описание (Description)

The dirname() function shall take a pointer to a character string
       that contains a pathname, and return a pointer to a string that
       is a pathname of the parent directory of that file. The dirname()
       function shall not perform pathname resolution; the result shall
       not be affected by whether or not path exists or by its file
       type. Trailing '/' characters in the path that are not also
       leading '/' characters shall not be counted as part of the path.

       If path does not contain a '/', then dirname() shall return a
       pointer to the string ".".  If path is a null pointer or points
       to an empty string, dirname() shall return a pointer to the
       string ".".

       The dirname() function may modify the string pointed to by path,
       and may return a pointer to static storage that may then be
       overwritten by a subsequent call to dirname().

       The dirname() function need not be thread-safe.

---

Возвращаемое значение (Return value)

The dirname() function shall return a pointer to a string as
       described above.

       The dirname() function may modify the string pointed to by path,
       and may return a pointer to internal storage. The returned
       pointer might be invalidated or the storage might be overwritten
       by a subsequent call to dirname().  The returned pointer might
       also be invalidated if the calling thread is terminated.

---

Ошибки (Error)

No errors are defined.

       The following sections are informative.

---

Примеры (Examples)

The following code fragment reads a pathname, changes the current
       working directory to the parent directory, and opens the file.

           char *path = NULL, *pathcopy;
           size_t buflen = 0;
           ssize_t linelen = 0;
           int fd;

           linelen = getline(&path, &buflen, stdin);

           path[linelen-1] = 0;
           pathcopy = strdup(path);
           if (chdir(dirname(pathcopy)) < 0) {
               ...
           }
           if ((fd = open(basename(path), O_RDONLY)) >= 0) {
               ...
               close (fd);
           }
           ...
           free (pathcopy);
           free (path);

       The EXAMPLES section of the basename() function (see
       basename(3p)) includes a table showing examples of the results of
       processing several sample pathnames by the basename() and
       dirname() functions and by the basename and dirname utilities.

---

Использование в приложениях (Application usage)

The dirname() and basename() functions together yield a complete
       pathname. The expression dirname(path) obtains the pathname of
       the directory where basename(path) is found.

       Since the meaning of the leading "//" is implementation-defined,
       dirname("//foo) may return either "//" or '/' (but nothing else).

---

Обоснование (Rationale)

None.

---

Будущие направления (Future directions)

None.

---

Смотри также (See also)

basename(3p)

       The Base Definitions volume of POSIX.1‐2017, libgen.h(0p)

       The Shell and Utilities volume of POSIX.1‐2017, basename(1p),
       dirname(1p)

---