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syscall_misc.c
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syscall_misc.c
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/*-
* Copyright (c) 2013 Antti Kantee. All Rights Reserved.
*
* 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 AUTHOR ``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 AUTHOR 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.
*/
/*
* Emulate a bit of mmap. Currently just MAP_ANON
* and MAP_FILE+PROT_READ are supported. For files, it's not true
* mmap, but should cover a good deal of the cases anyway.
*/
/* for libc namespace */
#define mmap _mmap
#include <sys/cdefs.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <lwp.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <bmk-core/core.h>
#include <bmk-core/sched.h>
#include <rump/rump.h>
#ifdef RUMPRUN_MMAP_DEBUG
#define MMAP_PRINTF(x) printf x
#else
#define MMAP_PRINTF(x)
#endif
void *
mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off)
{
void *v;
ssize_t nn;
int error;
if (fd != -1 && prot != PROT_READ) {
MMAP_PRINTF(("mmap: trying to r/w map a file. failing!\n"));
errno = ENOTSUP;
return MAP_FAILED;
}
if ((error = posix_memalign(&v, bmk_pagesize, len)) != 0) {
errno = error;
return MAP_FAILED;
}
if (flags & MAP_ANON)
return v;
if ((nn = pread(fd, v, len, off)) == -1) {
MMAP_PRINTF(("mmap: failed to populate r/o file mapping!\n"));
error = errno;
free(v);
errno = error;
return MAP_FAILED;
}
return v;
}
#undef mmap
__weak_alias(mmap,_mmap);
int
madvise(void *addr, size_t len, int adv)
{
/* thanks for the advise, pal */
return 0;
}
int
mprotect(void *addr, size_t len, int prot)
{
/* no protection */
return 0;
}
int
minherit(void *addr, size_t len, int inherit)
{
/* nothing to inherit */
return 0;
}
int
mlockall(int flags)
{
/* no vm => everything is automatically locked */
return 0;
}
int
munlockall(void)
{
/* no vm => no need to unlock */
return 0;
}
int
mlock(const void *addr, size_t len)
{
/* no vm => everything is automatically locked */
return 0;
}
int
munlock(const void *addr, size_t len)
{
/* no vm => no need to unlock */
return 0;
}
int
munmap(void *addr, size_t len)
{
free(addr);
return 0;
}
void __dead
_exit(int eval)
{
if (eval) {
printf("\n=== ERROR: _exit(%d) called ===\n", eval);
} else {
printf("\n=== _exit(%d) called ===\n", eval);
}
pthread_exit((void *)(uintptr_t)eval);
}
/* XXX: manual proto. plug into libc internals some other day */
int ____sigtimedwait50(const sigset_t * __restrict,
siginfo_t * __restrict, struct timespec * __restrict);
int
____sigtimedwait50(const sigset_t *set, siginfo_t *info,
struct timespec *timeout)
{
int rc;
rc = _lwp_park(CLOCK_MONOTONIC, 0, timeout, 0, NULL, NULL);
if (rc == -1) {
if (errno == ETIMEDOUT)
errno = EAGAIN;
} else {
errno = EAGAIN;
}
return -1;
}
/* XXX: manual proto. plug into libc internals some other day */
int __getrusage50(int, struct rusage *);
int
__getrusage50(int who, struct rusage *usage)
{
/* We fake something. We should query the scheduler some day */
memset(usage, 0, sizeof(*usage));
if (who == RUSAGE_SELF) {
usage->ru_utime.tv_sec = 1;
usage->ru_utime.tv_usec = 1;
usage->ru_stime.tv_sec = 1;
usage->ru_stime.tv_usec = 1;
}
usage->ru_maxrss = 1024;
usage->ru_ixrss = 1024;
usage->ru_idrss = 1024;
usage->ru_isrss = 1024;
usage->ru_nvcsw = 1;
usage->ru_nivcsw = 1;
/* XXX: wrong in many ways */
return ENOTSUP;
}
/* there is no virtual memory, tada */
int
mincore(void *addr, size_t length, char *vec)
{
long page_size = sysconf(_SC_PAGESIZE);
memset(vec, 0x01, (length + page_size - 1) / page_size);
return 0;
}