mirror of https://github.com/mkerrisk/man-pages
116 lines
3.2 KiB
Plaintext
116 lines
3.2 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "FCHOWN" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" fchown
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.SH NAME
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fchown \- change owner and group of a file
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.SH SYNOPSIS
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.LP
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\fB#include <unistd.h>
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.br
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.sp
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int fchown(int\fP \fIfildes\fP\fB, uid_t\fP \fIowner\fP\fB, gid_t\fP
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\fIgroup\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIfchown\fP() function shall be equivalent to \fIchown\fP() except
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that the file
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whose owner and group are changed is specified by the file descriptor
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\fIfildes\fP.
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.SH RETURN VALUE
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.LP
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Upon successful completion, \fIfchown\fP() shall return 0. Otherwise,
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it shall return -1 and set \fIerrno\fP to indicate the
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error.
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.SH ERRORS
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.LP
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The \fIfchown\fP() function shall fail if:
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.TP 7
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.B EBADF
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The \fIfildes\fP argument is not an open file descriptor.
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.TP 7
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.B EPERM
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The effective user ID does not match the owner of the file or the
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process does not have appropriate privilege and
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_POSIX_CHOWN_RESTRICTED indicates that such privilege is required.
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.TP 7
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.B EROFS
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The file referred to by \fIfildes\fP resides on a read-only file system.
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.sp
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.LP
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The \fIfchown\fP() function may fail if:
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.TP 7
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.B EINVAL
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The owner or group ID is not a value supported by the implementation.
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The \fIfildes\fP argument refers to a pipe or socket
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\ or an \fIfattach\fP()-ed STREAM \ and the implementation disallows
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execution of \fIfchown\fP() on a pipe.
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.TP 7
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.B EIO
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A physical I/O error has occurred.
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.TP 7
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.B EINTR
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The \fIfchown\fP() function was interrupted by a signal which was
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caught.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.SS Changing the Current Owner of a File
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.LP
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The following example shows how to change the owner of a file named
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\fB/home/cnd/mod1\fP to "jones" and the group to
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"cnd".
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.LP
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The numeric value for the user ID is obtained by extracting the user
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ID from the user database entry associated with "jones".
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Similarly, the numeric value for the group ID is obtained by extracting
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the group ID from the group database entry associated with
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"cnd". This example assumes the calling program has appropriate privileges.
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.sp
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.RS
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.nf
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\fB#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <grp.h>
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.sp
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struct passwd *pwd;
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struct group *grp;
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int fildes;
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\&...
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fildes = open("/home/cnd/mod1", O_RDWR);
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pwd = getpwnam("jones");
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grp = getgrnam("cnd");
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fchown(fildes, pwd->pw_uid, grp->gr_gid);
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\fP
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.fi
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.RE
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIchown\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
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\fI<unistd.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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