165 lines
4.1 KiB
C
165 lines
4.1 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2012
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* Copyright (c) Linux Test Project, 2012
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "test.h"
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#include "safe_macros.h"
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#include "lapi/syscalls.h"
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char *TCID = "process_vm_readv02";
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int TST_TOTAL = 1;
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static char *tst_string = "THIS IS A TEST";
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static int len;
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static int pipe_fd[2];
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static pid_t pids[2];
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static void child_alloc(void);
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static void child_invoke(void);
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static void setup(void);
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static void cleanup(void);
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int main(int argc, char **argv)
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{
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int lc, status;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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len = strlen(tst_string);
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SAFE_PIPE(cleanup, pipe_fd);
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/* the start of child_alloc and child_invoke is already
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* synchronized via pipe */
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pids[0] = fork();
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switch (pids[0]) {
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case -1:
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tst_brkm(TBROK | TERRNO, cleanup, "fork #0");
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case 0:
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child_alloc();
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exit(0);
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}
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pids[1] = fork();
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switch (pids[1]) {
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case -1:
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tst_brkm(TBROK | TERRNO, cleanup, "fork #1");
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case 0:
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child_invoke();
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exit(0);
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}
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/* wait until child_invoke reads from child_alloc's VM */
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SAFE_WAITPID(cleanup, pids[1], &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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tst_resm(TFAIL, "child 1 returns %d", status);
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/* child_alloc is free to exit now */
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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SAFE_WAITPID(cleanup, pids[0], &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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tst_resm(TFAIL, "child 0 returns %d", status);
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}
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cleanup();
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tst_exit();
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}
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static void child_alloc(void)
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{
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char *foo;
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char buf[BUFSIZ];
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foo = SAFE_MALLOC(tst_exit, len + 1);
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strncpy(foo, tst_string, len);
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foo[len] = '\0';
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tst_resm(TINFO, "child 0: memory allocated and initialized.");
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/* passing addr of string "foo" via pipe */
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SAFE_CLOSE(tst_exit, pipe_fd[0]);
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snprintf(buf, BUFSIZ, "%p", foo);
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SAFE_WRITE(tst_exit, 1, pipe_fd[1], buf, strlen(buf) + 1);
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SAFE_CLOSE(tst_exit, pipe_fd[1]);
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/* wait until child_invoke is done reading from our VM */
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TST_SAFE_CHECKPOINT_WAIT(cleanup, 0);
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}
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static void child_invoke(void)
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{
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char *lp, *rp;
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char buf[BUFSIZ];
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struct iovec local, remote;
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/* get addr from pipe */
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SAFE_CLOSE(tst_exit, pipe_fd[1]);
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SAFE_READ(tst_exit, 0, pipe_fd[0], buf, BUFSIZ);
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SAFE_CLOSE(tst_exit, pipe_fd[0]);
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if (sscanf(buf, "%p", &rp) != 1)
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tst_brkm(TBROK | TERRNO, tst_exit, "sscanf");
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lp = SAFE_MALLOC(tst_exit, len + 1);
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local.iov_base = lp;
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local.iov_len = len;
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remote.iov_base = rp;
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remote.iov_len = len;
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tst_resm(TINFO, "child 1: reading string from same memory location.");
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TEST(ltp_syscall(__NR_process_vm_readv, pids[0],
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&local, 1UL, &remote, 1UL, 0UL));
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if (TEST_RETURN != len)
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tst_brkm(TFAIL | TTERRNO, tst_exit, "process_vm_readv");
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if (strncmp(lp, tst_string, len) != 0)
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tst_brkm(TFAIL, tst_exit, "child 1: expected string: %s, "
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"received string: %256s", tst_string, lp);
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else
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tst_resm(TPASS, "expected string received.");
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}
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static void setup(void)
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{
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tst_require_root();
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/* Just a sanity check of the existence of syscall */
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ltp_syscall(__NR_process_vm_readv, getpid(), NULL, 0UL, NULL, 0UL, 0UL);
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tst_tmpdir();
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TST_CHECKPOINT_INIT(cleanup);
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TEST_PAUSE;
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}
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static void cleanup(void)
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{
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tst_rmdir();
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}
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