tests/lib/librumpclient/h_execthr.c

   1 /*      $NetBSD: h_execthr.c,v 1.2 2011/03/08 15:35:28 pooka Exp $      */
   2
   3 /*
   4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
   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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/types.h>
  31 #include <sys/sysctl.h>
  32
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <pthread.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include <rump/rumpclient.h>
  43 #include <rump/rump_syscalls.h>
  44
  45 static int canreturn = 0;
  46
  47 /*
  48  * Use a fairly large number of threads so that we have
  49  * a better chance catching races.  XXX: this is rumpuser's
  50  * MAXWORKER-1.
  51  */
  52 #define NTHR 63
  53
  54 static void *
  55 wrk(void *arg)
  56 {
  57         int fd = (uintptr_t)arg;
  58
  59         rump_sys_read(fd, &fd, sizeof(fd));
  60         if (!canreturn)
  61                 errx(1, "should not have returned");
  62         if (fd != 37)
  63                 errx(1, "got invalid magic");
  64
  65         return NULL;
  66 }
  67
  68 static int
  69 getproc(pid_t mypid, struct kinfo_proc2 *p)
  70 {
  71         int name[6];
  72         size_t len = sizeof(*p);
  73
  74         name[0] = CTL_KERN;
  75         name[1] = KERN_PROC2;
  76         name[2] = KERN_PROC_PID;
  77         name[3] = mypid;
  78         name[4] = len;
  79         name[5] = 1;
  80
  81         return rump_sys___sysctl(name, __arraycount(name), p, &len, NULL, 0);
  82 }
  83
  84 int
  85 main(int argc, char *argv[], char *envp[])
  86 {
  87         struct kinfo_proc2 p;
  88         char *execarg[3];
  89         int p1[2], p2[2];
  90         pid_t mypid;
  91         pthread_t pt;
  92         ssize_t n;
  93         int i, execd;
  94         char nexec[16];
  95
  96         if (argc > 1)
  97                 execd = atoi(argv[1]);
  98         else
  99                 execd = 0;
 100         sprintf(nexec, "%d", execd+1);
 101
 102         if (rumpclient_init() == -1) {
 103                 if (execd)
 104                         err(1, "init execd");
 105                 else
 106                         err(1, "init");
 107         }
 108         mypid = rump_sys_getpid();
 109
 110         if (execd) {
 111                 canreturn = 1;
 112                 if (pthread_create(&pt, NULL,
 113                     wrk, (void *)(uintptr_t)2) != 0)
 114                         errx(1, "exec pthread_create");
 115
 116                 i = 37;
 117                 rump_sys_write(3, &i, sizeof(i));
 118                 pthread_join(pt, NULL);
 119
 120                 n = rump_sys_read(0, &i, sizeof(i));
 121                 if (n != -1 || errno != EBADF)
 122                         errx(1, "post-exec cloexec works");
 123
 124                 getproc(mypid, &p);
 125                 if (p.p_nlwps != 2)
 126                         errx(1, "invalid nlwps: %lld", (long long)p.p_nlwps);
 127
 128                 /* we passed? */
 129                 if (execd > 10)
 130                         exit(0);
 131
 132                 rump_sys_close(2);
 133                 rump_sys_close(3);
 134         }
 135
 136         if (rump_sys_pipe(p1) == -1)
 137                 err(1, "pipe1");
 138         if (p1[0] != 0 || p1[1] != 1)
 139                 errx(1, "p1 assumptions failed %d %d", p1[0], p1[1]);
 140         if (rump_sys_pipe(p2) == -1)
 141                 err(1, "pipe1");
 142         if (p2[0] != 2 || p2[1] != 3)
 143                 errx(1, "p2 assumptions failed");
 144         if (rump_sys_fcntl(p1[0], F_SETFD, FD_CLOEXEC) == -1)
 145                 err(1, "cloexec");
 146         if (rump_sys_fcntl(p1[1], F_SETFD, FD_CLOEXEC) == -1)
 147                 err(1, "cloexec");
 148
 149         for (i = 0; i < NTHR; i++)
 150                 if (pthread_create(&pt, NULL,
 151                     wrk, (void *)(uintptr_t)p1[0]) != 0)
 152                         errx(1, "pthread_create 1 %d", i);
 153
 154         for (i = 0; i < NTHR; i++)
 155                 if (pthread_create(&pt, NULL,
 156                     wrk, (void *)(uintptr_t)p2[0]) != 0)
 157                         errx(1, "pthread_create 2 %d", i);
 158
 159         /* wait for all the threads to be enjoying themselves */
 160         for (;;) {
 161                 getproc(mypid, &p);
 162                 if (p.p_nlwps == 2*NTHR + 2)
 163                         break;
 164                 usleep(10000);
 165         }
 166
 167         /*
 168          * load up one more (big) set.  these won't start executing, though,
 169          * but we're interested in if they create blockage
 170          */
 171         for (i = 0; i < 3*NTHR; i++)
 172                 if (pthread_create(&pt, NULL,
 173                     wrk, (void *)(uintptr_t)p1[0]) != 0)
 174                         errx(1, "pthread_create 1 %d", i);
 175
 176         /* then, we exec! */
 177         execarg[0] = argv[0];
 178         execarg[1] = nexec;
 179         execarg[2] = NULL;
 180         if (rumpclient_exec(argv[0], execarg, envp) == -1)
 181                 err(1, "exec");
 182 }