tests/lib/librumpclient/h_execthr.c

   1 /*      $NetBSD: h_execthr.c,v 1.3 2014/08/13 00:03:00 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 #define P1_0 3
  55 #define P1_1 4
  56 #define P2_0 5
  57 #define P2_1 6
  58
  59 static void *
  60 wrk(void *arg)
  61 {
  62         int fd = (uintptr_t)arg;
  63
  64         rump_sys_read(fd, &fd, sizeof(fd));
  65         if (!canreturn)
  66                 errx(1, "should not have returned");
  67         if (fd != 37)
  68                 errx(1, "got invalid magic");
  69
  70         return NULL;
  71 }
  72
  73 static int
  74 getproc(pid_t mypid, struct kinfo_proc2 *p)
  75 {
  76         int name[6];
  77         size_t len = sizeof(*p);
  78
  79         name[0] = CTL_KERN;
  80         name[1] = KERN_PROC2;
  81         name[2] = KERN_PROC_PID;
  82         name[3] = mypid;
  83         name[4] = len;
  84         name[5] = 1;
  85
  86         return rump_sys___sysctl(name, __arraycount(name), p, &len, NULL, 0);
  87 }
  88
  89 int
  90 main(int argc, char *argv[], char *envp[])
  91 {
  92         struct kinfo_proc2 p;
  93         char *execarg[3];
  94         int p1[2], p2[2];
  95         pid_t mypid;
  96         pthread_t pt;
  97         ssize_t n;
  98         int i, execd;
  99         char nexec[16];
 100
 101         if (argc > 1)
 102                 execd = atoi(argv[1]);
 103         else
 104                 execd = 0;
 105         sprintf(nexec, "%d", execd+1);
 106
 107         if (rumpclient_init() == -1) {
 108                 if (execd)
 109                         err(1, "init execd");
 110                 else
 111                         err(1, "init");
 112         }
 113         mypid = rump_sys_getpid();
 114
 115         if (execd) {
 116                 canreturn = 1;
 117                 if (pthread_create(&pt, NULL,
 118                     wrk, (void *)(uintptr_t)P2_0) != 0)
 119                         errx(1, "exec pthread_create");
 120
 121                 i = 37;
 122                 rump_sys_write(P2_1, &i, sizeof(i));
 123                 pthread_join(pt, NULL);
 124
 125                 n = rump_sys_read(P1_0, &i, sizeof(i));
 126                 if (n != -1 || errno != EBADF)
 127                         errx(1, "post-exec cloexec works");
 128
 129                 getproc(mypid, &p);
 130                 if (p.p_nlwps != 2)
 131                         errx(1, "invalid nlwps: %lld", (long long)p.p_nlwps);
 132
 133                 /* we passed? */
 134                 if (execd > 10)
 135                         exit(0);
 136
 137                 rump_sys_close(P2_0);
 138                 rump_sys_close(P2_1);
 139         }
 140
 141         if (rump_sys_pipe(p1) == -1)
 142                 err(1, "pipe1");
 143         if (p1[0] != P1_0 || p1[1] != P1_1)
 144                 errx(1, "p1 assumptions failed %d %d", p1[0], p1[1]);
 145         if (rump_sys_pipe(p2) == -1)
 146                 err(1, "pipe1");
 147         if (p2[0] != P2_0 || p2[1] != P2_1)
 148                 errx(1, "p2 assumptions failed");
 149         if (rump_sys_fcntl(p1[0], F_SETFD, FD_CLOEXEC) == -1)
 150                 err(1, "cloexec");
 151         if (rump_sys_fcntl(p1[1], F_SETFD, FD_CLOEXEC) == -1)
 152                 err(1, "cloexec");
 153
 154         for (i = 0; i < NTHR; i++)
 155                 if (pthread_create(&pt, NULL,
 156                     wrk, (void *)(uintptr_t)p1[0]) != 0)
 157                         errx(1, "pthread_create 1 %d", i);
 158
 159         for (i = 0; i < NTHR; i++)
 160                 if (pthread_create(&pt, NULL,
 161                     wrk, (void *)(uintptr_t)p2[0]) != 0)
 162                         errx(1, "pthread_create 2 %d", i);
 163
 164         /* wait for all the threads to be enjoying themselves */
 165         for (;;) {
 166                 getproc(mypid, &p);
 167                 if (p.p_nlwps == 2*NTHR + 2)
 168                         break;
 169                 usleep(10000);
 170         }
 171
 172         /*
 173          * load up one more (big) set.  these won't start executing, though,
 174          * but we're interested in if they create blockage
 175          */
 176         for (i = 0; i < 3*NTHR; i++)
 177                 if (pthread_create(&pt, NULL,
 178                     wrk, (void *)(uintptr_t)p1[0]) != 0)
 179                         errx(1, "pthread_create 1 %d", i);
 180
 181         /* then, we exec! */
 182         execarg[0] = argv[0];
 183         execarg[1] = nexec;
 184         execarg[2] = NULL;
 185         if (rumpclient_exec(argv[0], execarg, envp) == -1)
 186                 err(1, "exec");
 187 }