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setruid.c revision 1.4 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char *sccsid = "from: @(#)setruid.c	5.5 (Berkeley) 2/23/91";*/
     36 static char *rcsid = "$Id: setruid.c,v 1.4 1994/04/24 01:00:42 mycroft Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <stdio.h>
     40 #include <unistd.h>
     41 #include <sys/uio.h>
     42 
     43 int
     44 #ifdef __STDC__
     45 setruid(uid_t ruid)
     46 #else
     47 setruid(ruid)
     48 	int ruid;
     49 #endif
     50 {
     51 	static int warned;
     52 	static char w[] =
     53 	    ": warning: this program uses setruid(), which is deprecated.\r\n";
     54 
     55 	if (!warned) {
     56 		struct iovec iov[2];
     57 		extern char *__progname;	/* in crt0 */
     58 
     59 		iov[0].iov_base = __progname;
     60 		iov[0].iov_len = strlen(__progname);
     61 		iov[1].iov_base = w;
     62 		iov[1].iov_len = strlen(w);
     63 		(void) writev(STDERR_FILENO, iov, 2);
     64 		warned = 1;
     65 	}
     66 
     67 	return (__setreuid(ruid, -1));
     68 }
     69