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      1 /*
      2  * Check decoding of return values injected into a syscall that "never fails".
      3  *
      4  * Copyright (c) 2018 The strace developers.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "tests.h"
     31 
     32 #include <assert.h>
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <asm/unistd.h>
     36 
     37 #include "raw_syscall.h"
     38 
     39 #ifdef __alpha__
     40 /* alpha has no getpid */
     41 # define SC_NR __NR_getpgrp
     42 # define SC_NAME "getpgrp"
     43 # define getpid getpgrp
     44 #else
     45 # define SC_NR __NR_getpid
     46 # define SC_NAME "getpid"
     47 #endif
     48 
     49 #ifdef raw_syscall_0
     50 # define INVOKE_SC(err) raw_syscall_0(SC_NR, &err)
     51 #else
     52 /* No raw_syscall_0, let's use getpid() and hope for the best.  */
     53 # define INVOKE_SC(err) getpid()
     54 #endif
     55 
     56 /*
     57  * This prototype is intentionally different
     58  * from the prototype provided by <unistd.h>.
     59  */
     60 extern kernel_ulong_t getpid(void);
     61 
     62 int
     63 main(int ac, char **av)
     64 {
     65 	assert(ac == 1 || ac == 2);
     66 
     67 	kernel_ulong_t expected =
     68 		(ac == 1) ? getpid() : strtoull(av[1], NULL, 0);
     69 	kernel_ulong_t err = 0;
     70 	kernel_ulong_t rc = INVOKE_SC(err);
     71 
     72 	if (err || rc != expected)
     73 		error_msg_and_fail("expected %#llx, got rval=%#llx err=%#llx",
     74 				   (unsigned long long) expected,
     75 				   (unsigned long long) rc,
     76 				   (unsigned long long) err);
     77 
     78 	if (ac == 2) {
     79 		printf("%s() = %llu (INJECTED)\n",
     80 		       SC_NAME, (unsigned long long) rc);
     81 
     82 		puts("+++ exited with 0 +++");
     83 	}
     84 
     85 	return 0;
     86 }
     87