Dmitry V. Levin
a33747a902
From time to time various kernels, old and new, just go nuts
and fail attach-p-cmd.test with the following diagnostics:
12345 --- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
-12345 chdir("attach-p-cmd.test -p") = -1 ENOENT (No such file or directory)
+12345 syscall_4294967295(0xffe60934, 0x1c0, 0xffe60934, 0x1, 0xffe609b4, 0xffe60a58) = -1 (errno 38)
+12345 chdir("attach-p-cmd.test -p") = -1 ENOSYS (Function not implemented)
Let's workaround this kernel madness by rewriting the test
without use of SIGALRM.
* tests/attach-p-cmd.h: New file.
* tests/Makefile.am (EXTRA_DIST): Add attach-p-cmd.h.
* tests/attach-p-cmd-cmd.c: Include "attach-p-cmd.h".
(write_pidfile, wait_for_peer_invocation): New functions.
(main): Use them.
* tests/attach-p-cmd-p.c: Include <time.h> and "attach-p-cmd.h".
(wait_for_peer_invocation, wait_for_peer_termination): New functions.
(main): Use them. Do not raise SIGALRM, use nanosleep after peer
termination.
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
/*
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* This file is part of attach-p-cmd strace test.
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*
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* Copyright (c) 2016-2017 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include "attach-p-cmd.h"
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static void
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wait_for_peer_invocation(void)
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{
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/* create the lock directory */
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if (mkdir(lockdir, 0700))
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perror_msg_and_fail("mkdir: %s", lockdir);
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/* wait for the lock directory to be removed by peer */
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while (mkdir(lockdir, 0700)) {
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if (EEXIST != errno)
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perror_msg_and_fail("mkdir: %s", lockdir);
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}
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/* cleanup the lock directory */
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if (rmdir(lockdir))
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perror_msg_and_fail("rmdir: %s", lockdir);
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}
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static void
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wait_for_peer_termination(void)
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{
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FILE *fp = fopen(pidfile, "r");
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if (!fp)
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perror_msg_and_fail("fopen: %s", pidfile);
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pid_t pid;
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if (fscanf(fp, "%d", &pid) < 0)
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perror_msg_and_fail("fscanf: %s", pidfile);
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if (pid < 0)
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error_msg_and_fail("pid = %d", pid);
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if (fclose(fp))
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perror_msg_and_fail("fclose: %s", pidfile);
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if (unlink(pidfile))
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perror_msg_and_fail("unlink: %s", pidfile);
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while (kill(pid, 0) == 0)
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;
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}
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int
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main(void)
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{
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wait_for_peer_invocation();
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wait_for_peer_termination();
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static const struct timespec ts = { .tv_nsec = 123456789 };
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if (nanosleep(&ts, NULL))
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perror_msg_and_fail("nanosleep");
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static const char dir[] = "attach-p-cmd.test -p";
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pid_t pid = getpid();
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int rc = chdir(dir);
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printf("%-5d chdir(\"%s\") = %s\n"
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"%-5d +++ exited with 0 +++\n",
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pid, dir, sprintrc(rc), pid);
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return 0;
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}
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