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   fchown.3p    ( 3 )

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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.

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Имя (Name)

fchown — change owner and group of a file

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Синопсис (Synopsis)

#include <unistd.h>

int fchown(int fildes, uid_t owner, gid_t group);

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Описание (Description)

The fchown() function shall be equivalent to chown() except that the file whose owner and group are changed is specified by the file descriptor fildes.

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Возвращаемое значение (Return value)

Upon successful completion, fchown() shall return 0. Otherwise, it shall return -1 and set errno to indicate the error.

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Ошибки (Error)

The fchown() function shall fail if:

EBADF The fildes argument is not an open file descriptor.

EPERM The effective user ID does not match the owner of the file or the process does not have appropriate privileges and _POSIX_CHOWN_RESTRICTED indicates that such privilege is required.

EROFS The file referred to by fildes resides on a read-only file system.

The fchown() function may fail if:

EINVAL The owner or group ID is not a value supported by the implementation. The fildes argument refers to a pipe or socket or an fattach()-ed STREAM and the implementation disallows execution of fchown() on a pipe.

EIO A physical I/O error has occurred.

EINTR The fchown() function was interrupted by a signal which was caught.

The following sections are informative.

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Примеры (Examples)

Changing the Current Owner of a File
       The following example shows how to change the owner of a file
       named /home/cnd/mod1 to ``jones'' and the group to ``cnd''.

       The numeric value for the user ID is obtained by extracting the
       user ID from the user database entry associated with ``jones''.
       Similarly, the numeric value for the group ID is obtained by
       extracting the group ID from the group database entry associated
       with ``cnd''. This example assumes the calling program has
       appropriate privileges.

           #include <sys/types.h>
           #include <unistd.h>
           #include <fcntl.h>
           #include <pwd.h>
           #include <grp.h>

           struct passwd *pwd;
           struct group  *grp;
           int            fildes;
           ...
           fildes = open("/home/cnd/mod1", O_RDWR);
           pwd = getpwnam("jones");
           grp = getgrnam("cnd");
           fchown(fildes, pwd->pw_uid, grp->gr_gid);

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Использование в приложениях (Application usage)

None.

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Обоснование (Rationale)

None.

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Будущие направления (Future directions)

None.

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Смотри также (See also)

chown(3p)

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

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