NetBSD/tests/lib/libc/sys/msg.h

153 lines
4.0 KiB
C

/* $NetBSD: msg.h,v 1.3 2020/03/06 14:06:56 kamil Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
struct msg_fds {
int pfd[2];
int cfd[2];
};
#define CLOSEFD(fd) do { \
if (fd != -1) { \
close(fd); \
fd = -1; \
} \
} while (/*CONSTCOND*/ 0)
static int __used
msg_open(struct msg_fds *fds)
{
if (pipe(fds->pfd) == -1)
return -1;
if (pipe(fds->cfd) == -1) {
close(fds->pfd[0]);
close(fds->pfd[1]);
return -1;
}
return 0;
}
static void __used
msg_close(struct msg_fds *fds)
{
CLOSEFD(fds->pfd[0]);
CLOSEFD(fds->pfd[1]);
CLOSEFD(fds->cfd[0]);
CLOSEFD(fds->cfd[1]);
}
static int __used
msg_write_child(const char *info, struct msg_fds *fds, void *msg, size_t len)
{
ssize_t rv;
CLOSEFD(fds->cfd[1]);
CLOSEFD(fds->pfd[0]);
// printf("Send %s\n", info);
rv = write(fds->pfd[1], msg, len);
if (rv != (ssize_t)len)
return 1;
// printf("Wait %s\n", info);
rv = read(fds->cfd[0], msg, len);
if (rv != (ssize_t)len)
return 1;
return 0;
}
static int __used
msg_write_parent(const char *info, struct msg_fds *fds, void *msg, size_t len)
{
ssize_t rv;
CLOSEFD(fds->pfd[1]);
CLOSEFD(fds->cfd[0]);
// printf("Send %s\n", info);
rv = write(fds->cfd[1], msg, len);
if (rv != (ssize_t)len)
return 1;
// printf("Wait %s\n", info);
rv = read(fds->pfd[0], msg, len);
if (rv != (ssize_t)len)
return 1;
return 0;
}
static int __used
msg_read_parent(const char *info, struct msg_fds *fds, void *msg, size_t len)
{
ssize_t rv;
CLOSEFD(fds->pfd[1]);
CLOSEFD(fds->cfd[0]);
// printf("Wait %s\n", info);
rv = read(fds->pfd[0], msg, len);
if (rv != (ssize_t)len)
return 1;
// printf("Send %s\n", info);
rv = write(fds->cfd[1], msg, len);
if (rv != (ssize_t)len)
return 1;
return 0;
}
static int __used
msg_read_child(const char *info, struct msg_fds *fds, void *msg, size_t len)
{
ssize_t rv;
CLOSEFD(fds->cfd[1]);
CLOSEFD(fds->pfd[0]);
// printf("Wait %s\n", info);
rv = read(fds->cfd[0], msg, len);
if (rv != (ssize_t)len)
return 1;
// printf("Send %s\n", info);
rv = write(fds->pfd[1], msg, len);
if (rv != (ssize_t)len)
return 1;
return 0;
}
#define PARENT_TO_CHILD(info, fds, msg) \
SYSCALL_REQUIRE(msg_write_child(info " to child " # fds, &fds, &msg, \
sizeof(msg)) == 0)
#define CHILD_FROM_PARENT(info, fds, msg) \
FORKEE_ASSERT(msg_read_parent(info " from parent " # fds, &fds, &msg, \
sizeof(msg)) == 0)
#define CHILD_TO_PARENT(info, fds, msg) \
FORKEE_ASSERT(msg_write_parent(info " to parent " # fds, &fds, &msg, \
sizeof(msg)) == 0)
#define PARENT_FROM_CHILD(info, fds, msg) \
SYSCALL_REQUIRE(msg_read_child(info " from parent " # fds, &fds, &msg, \
sizeof(msg)) == 0)