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core-shim.c
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core-shim.c
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/*
* Copyright (C) 2014-2021 Canonical, Ltd.
* Copyright (C) 2021-2023 Colin Ian King
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#define STRESS_CORE_SHIM
#include "stress-ng.h"
#include "core-arch.h"
#include "core-asm-riscv.h"
#include "core-cpu-cache.h"
#include "core-pragma.h"
#if defined(__NR_pkey_get)
#define HAVE_PKEY_GET
#endif
#if defined(__NR_pkey_set)
#define HAVE_PKEY_SET
#endif
#if defined(HAVE_GRP_H)
#include <grp.h>
#else
UNEXPECTED
#endif
#if defined(HAVE_USTAT_H)
#if defined(__sun__)
/* ustat and long file support on sun does not build */
#undef HAVE_USTAT_H
#else
#include <ustat.h>
#endif
#endif
#if defined(HAVE_LINUX_FUTEX_H)
#include <linux/futex.h>
#endif
#if defined(HAVE_ASM_CACHECTL_H)
#include <asm/cachectl.h>
#endif
#if defined(HAVE_MODIFY_LDT)
#include <asm/ldt.h>
#endif
#if defined(HAVE_SYS_PIDFD_H)
#include <sys/pidfd.h>
#endif
#if defined(HAVE_SYS_PRCTL_H)
#include <sys/prctl.h>
#endif
#if defined(HAVE_SYS_TIMEX_H)
#include <sys/timex.h>
#endif
#if defined(HAVE_SYS_RANDOM_H)
#include <sys/random.h>
#endif
#if defined(HAVE_SYS_XATTR_H)
#include <sys/xattr.h>
#undef HAVE_ATTR_XATTR_H
#elif defined(HAVE_ATTR_XATTR_H)
#include <attr/xattr.h>
#endif
/* Sanity check */
#if defined(HAVE_SYS_XATTR_H) && \
defined(HAVE_ATTR_XATTR_H)
#error cannot have both HAVE_SYS_XATTR_H and HAVE_ATTR_XATTR_H
#endif
#if defined(HAVE_RUSAGE_WHO_T)
#define shim_rusage_who_t __rusage_who_t
#else
#define shim_rusage_who_t int
#endif
#if defined(HAVE_LINUX_MODULE_H)
#include <linux/module.h>
#endif
#if defined(__sun__)
#if defined(HAVE_GETDOMAINNAME)
extern int getdomainname(char *name, size_t len);
#endif
#if defined(HAVE_SETDOMAINNAME)
extern int setdomainname(const char *name, size_t len);
#endif
#endif
#define FALLOCATE_BUF_SIZE (8192)
/*
* Various shim abstraction wrappers around systems calls and
* GCC helper functions that may not be supported by some
* kernels or versions of different C libraries.
*/
/*
* shim_enosys()
* simulate unimplemented system call. Ignores
* the sysnr argument and all following 1..N syscall
* arguments. Returns -1 and sets errno to ENOSYS
*/
static inline long shim_enosys(long sysnr, ...)
{
(void)sysnr;
errno = ENOSYS;
return (long)-1;
}
/*
* shim_sched_yield()
* wrapper for sched_yield(2) - yield the processor
*/
int shim_sched_yield(void)
{
#if defined(HAVE_SCHED_YIELD)
return sched_yield();
#elif defined(__NR_sched_yield) && \
defined(HAVE_SYSCALL)
return syscall(__NR_sched_yield);
#else
UNEXPECTED
return sleep(0);
#endif
}
/*
* shim_cacheflush()
* wrapper for cacheflush(2), flush contents of
* instruction and/or data cache
*/
int shim_cacheflush(char *addr, int nbytes, int cache)
{
#if defined(HAVE_ASM_CACHECTL_H) && \
defined(HAVE_CACHEFLUSH) && \
defined(STRESS_ARCH_MIPS)
extern int cacheflush(void *addr, int nbytes, int cache);
return cacheflush((void *)addr, nbytes, cache);
#elif defined(STRESS_ARCH_RISCV)
#if defined(__NR_riscv_flush_icache)
if (cache == SHIM_ICACHE) {
if (syscall(__NR_riscv_flush_icache, (uintptr_t)addr,
((uintptr_t)addr) + nbytes, 0) == 0) {
return 0;
}
}
#endif
#if defined(HAVE_ASM_RISCV_FENCE_I)
if (cache == SHIM_ICACHE) {
stress_asm_riscv_fence_i();
return 0;
}
#endif
#if defined(HAVE_ASM_RISCV_FENCE)
if (cache == SHIM_ICACHE) {
stress_asm_riscv_fence();
return 0;
}
#endif
return -1;
#elif defined(HAVE_BUILTIN___CLEAR_CACHE)
/* More portable builtin */
(void)cache;
__builtin___clear_cache((void *)addr, (void *)(addr + nbytes));
return 0;
#elif defined(__NR_cacheflush) && \
defined(HAVE_SYSCALL)
/* potentially incorrect args, needs per-arch fixing */
return (int)syscall(__NR_cacheflush, addr, nbytes, cache);
#else
return (int)shim_enosys(0, addr, nbytes, cache);
#endif
}
/*
* shim_copy_file_range()
* wrapper for copy_file_range(2), copy range of data
* from one file to another
*/
ssize_t shim_copy_file_range(
int fd_in,
shim_loff_t *off_in,
int fd_out,
shim_loff_t *off_out,
size_t len,
unsigned int flags)
{
#if defined(HAVE_COPY_FILE_RANGE)
return copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
#elif defined(__NR_copy_file_range) && \
defined(HAVE_SYSCALL)
return (ssize_t)syscall(__NR_copy_file_range,
fd_in, off_in, fd_out, off_out, len, flags);
#else
return (ssize_t)shim_enosys(0, fd_in, off_in, fd_out, off_out, len, flags);
#endif
}
/*
* shim_emulate_fallocate()
* emulate fallocate (very slow!)
*/
static int shim_emulate_fallocate(int fd, off_t offset, off_t len)
{
char buffer[FALLOCATE_BUF_SIZE];
off_t n;
n = lseek(fd, offset, SEEK_SET);
if (n == (off_t)-1)
return -1;
(void)memset(buffer, 0, FALLOCATE_BUF_SIZE);
n = len;
while (keep_stressing_flag() && (n > 0)) {
ssize_t ret;
const size_t count = (size_t)STRESS_MINIMUM(n, FALLOCATE_BUF_SIZE);
ret = write(fd, buffer, count);
if (ret >= 0) {
n -= ret;
} else {
return -1;
}
}
return 0;
}
/*
* shim_fallocate()
* shim wrapper for fallocate system call
* - falls back to posix_fallocate w/o mode
* - falls back to direct writes
*/
int shim_fallocate(int fd, int mode, off_t offset, off_t len)
{
#if defined(HAVE_FALLOCATE)
int ret;
ret = fallocate(fd, mode, offset, len);
/* mode not supported? try with zero mode (dirty hack) */
if ((ret < 0) && (errno == EOPNOTSUPP)) {
#if defined(FALLOC_FL_PUNCH_HOLE)
if (mode & FALLOC_FL_PUNCH_HOLE)
return ret;
#endif
#if defined(FALLOC_FL_COLLAPSE_RANGE)
if (mode & FALLOC_FL_COLLAPSE_RANGE)
return ret;
#endif
#if defined(HAVE_SYSCALL)
ret = (int)syscall(__NR_fallocate, fd, 0, offset, len);
#else
ret = -1;
errno = ENOSYS;
#endif
/* fallocate failed, try emulation mode */
if ((ret < 0) && (errno == EOPNOTSUPP)) {
ret = shim_emulate_fallocate(fd, offset, len);
}
}
return ret;
#elif defined(__NR_fallocate) && \
defined(HAVE_SYSCALL)
int ret;
ret = syscall(__NR_fallocate, fd, mode, offset, len);
/* mode not supported? try with zero mode (dirty hack) */
if ((ret < 0) && (errno == EOPNOTSUPP)) {
#if defined(FALLOC_FL_PUNCH_HOLE)
if (mode & FALLOC_FL_PUNCH_HOLE)
return ret;
#endif
#if defined(FALLOC_FL_COLLAPSE_RANGE)
if (mode & FALLOC_FL_COLLAPSE_RANGE)
return ret;
#endif
ret = syscall(__NR_fallocate, fd, 0, offset, len);
/* fallocate failed, try emulation mode */
if ((ret < 0) && (errno == EOPNOTSUPP)) {
ret = shim_emulate_fallocate(fd, offset, len);
}
}
return ret;
#elif defined(HAVE_POSIX_FALLOCATE) && \
!defined(__FreeBSD_kernel__)
/*
* Even though FreeBSD kernels support this, large
* allocations take forever to be interrupted and so
* we don't use this for FreeBSD for now.
*/
int ret;
(void)mode;
#if defined(FALLOC_FL_PUNCH_HOLE)
if (mode & FALLOC_FL_PUNCH_HOLE)
return 0;
#endif
#if defined(FALLOC_FL_COLLAPSE_RANGE)
if (mode & FALLOC_FL_COLLAPSE_RANGE)
return 0;
#endif
/*
* posix_fallocate returns 0 for success, > 0 as errno
*/
ret = posix_fallocate(fd, offset, len);
errno = 0;
if (ret != 0) {
/* failed, so retry with slower emulated fallocate */
ret = shim_emulate_fallocate(fd, offset, len);
}
return ret;
#else
(void)mode;
#if defined(FALLOC_FL_PUNCH_HOLE)
if (mode & FALLOC_FL_PUNCH_HOLE)
return 0;
#endif
#if defined(FALLOC_FL_COLLAPSE_RANGE)
if (mode & FALLOC_FL_COLLAPSE_RANGE)
return 0;
#endif
return shim_emulate_fallocate(fd, offset, len);
#endif
}
/*
* shim_gettid()
* wrapper for gettid(2), get thread identification
*/
int shim_gettid(void)
{
#if defined(HAVE_GETTID)
return gettid();
#elif defined(__NR_gettid) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_gettid);
#else
UNEXPECTED
return (int)shim_enosys(0);
#endif
}
/*
* shim_getcpu()
* wrapper for getcpu(2) - get CPU and NUMA node of
* calling thread
*/
long shim_getcpu(
unsigned *cpu,
unsigned *node,
void *tcache)
{
#if defined(HAVE_GETCPU) && !defined(STRESS_ARCH_S390)
(void)tcache;
return (long)getcpu(cpu, node);
#elif defined(__NR_getcpu) && \
defined(HAVE_SYSCALL)
return (long)syscall(__NR_getcpu, cpu, node, tcache);
#else
UNEXPECTED
return (long)shim_enosys(0, cpu, node, tcache);
#endif
}
/*
* shim_getdents()
* wrapper for getdents(2) - get directory entries
*/
int shim_getdents(
unsigned int fd,
struct shim_linux_dirent *dirp,
unsigned int count)
{
#if defined(__NR_getdents) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_getdents, fd, dirp, count);
#else
return (int)shim_enosys(0, fd, dirp, count);
#endif
}
/*
* shim_getdent64()
* wrapper for getdents64(2) - get directory entries
*/
int shim_getdents64(
unsigned int fd,
struct shim_linux_dirent64 *dirp,
unsigned int count)
{
#if defined(__NR_getdents64) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_getdents64, fd, dirp, count);
#else
return (int)shim_enosys(0, fd, dirp, count);
#endif
}
/*
* shim_getrandom()
* wrapper for Linux getrandom(2) and BSD getentropy(2)
*/
int shim_getrandom(void *buff, size_t buflen, unsigned int flags)
{
#if defined(HAVE_SYS_RANDOM_H) && \
defined(HAVE_GETRANDOM)
return (int)getrandom(buff, buflen, flags);
#elif defined(__NR_getrandom) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_getrandom, buff, buflen, flags);
#elif defined(__OpenBSD__) || defined(__APPLE__)
(void)flags;
return getentropy(buff, buflen);
#else
UNEXPECTED
return (int)shim_enosys(0, buff, buflen, flags);
#endif
}
/*
* shim_flush_icache()
* wrapper for RISC-V icache flush and ARM __clear_cache gcc intrinsic
*/
void shim_flush_icache(void *begin, void *end)
{
#if defined(__GNUC__) && \
defined(STRESS_ARCH_ARM)
__clear_cache(begin, end);
#elif defined(STRESS_ARCH_RISCV) && \
defined(__NR_riscv_flush_icache) && \
defined(HAVE_SYSCALL)
(void)syscall(__NR_riscv_flush_icache, begin, end, 0);
#else
(void)shim_enosys(0, begin, end);
#endif
}
/*
* shim_kcmp()
* wrapper for Linux kcmp(2) - compare two processes to
* see if they share a kernel resource.
*/
long shim_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2)
{
#if defined(__NR_kcmp) && \
defined(HAVE_SYSCALL)
errno = 0;
return (long)syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
#else
return (long)shim_enosys(0, pid1, pid2, type, idx1, idx2);
#endif
}
/*
* shim_klogctl()
* wrapper for syslog(2) (NOT syslog(3))
*/
int shim_klogctl(int type, char *bufp, int len)
{
#if defined(__NR_syslog) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_syslog, type, bufp, len);
#else
return (int)shim_enosys(0, type, bufp, len);
#endif
}
/*
* shim_membarrier()
* wrapper for membarrier(2) - issue memory barriers
*/
int shim_membarrier(int cmd, int flags, int cpu_id)
{
#if defined(__NR_membarrier) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_membarrier, cmd, flags, cpu_id);
#else
return (int)shim_enosys(0, cmd, flags, cpu_id);
#endif
}
/*
* shim_memfd_create()
* wrapper for memfd_create(2)
*/
int shim_memfd_create(const char *name, unsigned int flags)
{
#if defined(HAVE_MEMFD_CREATE)
return memfd_create(name, flags);
#elif defined(__NR_memfd_create) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_memfd_create, name, flags);
#else
return (int)shim_enosys(0, name, flags);
#endif
}
/*
* shim_get_mempolicy()
* wrapper for get_mempolicy(2) - get NUMA memory policy
*/
int shim_get_mempolicy(
int *mode,
unsigned long *nodemask,
unsigned long maxnode,
void *addr,
unsigned long flags)
{
#if defined(__NR_get_mempolicy) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_get_mempolicy,
mode, nodemask, maxnode, addr, flags);
#else
return (int)shim_enosys(0, mode, nodemask, maxnode, addr, flags);
#endif
}
/*
* shim_set_mempolicy()
* wrapper for set_mempolicy(2) - set NUMA memory policy
*/
int shim_set_mempolicy(
int mode,
unsigned long *nodemask,
unsigned long maxnode)
{
#if defined(__NR_set_mempolicy) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_set_mempolicy,
mode, nodemask, maxnode);
#else
return (int)shim_enosys(0, mode, nodemask, maxnode);
#endif
}
/*
* shim_mbind()
* wrapper for mbind(2) - set memory policy for a memory range
*/
long shim_mbind(
void *addr,
unsigned long len,
int mode,
const unsigned long *nodemask,
unsigned long maxnode,
unsigned flags)
{
#if defined(__NR_mbind) && \
defined(HAVE_SYSCALL)
return (long)syscall(__NR_mbind,
addr, len, mode, nodemask, maxnode, flags);
#else
return (long)shim_enosys(0, addr, len, mode, nodemask, maxnode, flags);
#endif
}
/*
* shim_migrate_pages()
* wrapper for migrate_pages(2) - move all pages in a process to other nodes
*/
long shim_migrate_pages(
int pid,
unsigned long maxnode,
const unsigned long *old_nodes,
const unsigned long *new_nodes)
{
#if defined(__NR_migrate_pages) && \
defined(HAVE_SYSCALL)
return (long)syscall(__NR_migrate_pages,
pid, maxnode, old_nodes, new_nodes);
#else
return (long)shim_enosys(0, pid, maxnode, old_nodes, new_nodes);
#endif
}
/*
* shim_move_pages()
* wrapper for move_pages(2) - move pages in a process to other nodes
*/
long shim_move_pages(
int pid,
unsigned long count,
void **pages,
const int *nodes,
int *status,
int flags)
{
#if defined(__NR_move_pages) && \
defined(HAVE_SYSCALL)
return (long)syscall(__NR_move_pages, pid, count, pages, nodes,
status, flags);
#else
return (long)shim_enosys(0, pid, count, pages, nodes, status, flags);
#endif
}
/*
* shim_userfaultfd()
* wrapper for userfaultfd(2)
*/
int shim_userfaultfd(int flags)
{
#if defined(__NR_userfaultfd) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_userfaultfd, flags);
#else
return (int)shim_enosys(0, flags);
#endif
}
/*
* shim_seccomp()
* wrapper for seccomp(2) - operate on Secure Computing state of process
*/
int shim_seccomp(unsigned int operation, unsigned int flags, void *args)
{
#if defined(__NR_seccomp) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_seccomp, operation, flags, args);
#else
return (int)shim_enosys(0, operation, flags, args);
#endif
}
/*
* shim_unshare()
* wrapper for unshare(2)
*/
int shim_unshare(int flags)
{
#if defined(HAVE_UNSHARE)
return unshare(flags);
#elif defined(__NR_unshare) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_unshare, flags);
#else
return (int)shim_enosys(0, flags);
#endif
}
/*
* shim_shed_getattr()
* wrapper for shed_getattr(2)
*/
int shim_sched_getattr(
pid_t pid,
struct shim_sched_attr *attr,
unsigned int size,
unsigned int flags)
{
#if defined(__NR_sched_getattr) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_sched_getattr, pid, attr, size, flags);
#else
return (int)shim_enosys(0, pid, attr, size, flags);
#endif
}
/*
* shim_shed_setattr()
* wrapper for shed_setattr(2)
*/
int shim_sched_setattr(
pid_t pid,
struct shim_sched_attr *attr,
unsigned int flags)
{
#if defined(__NR_sched_setattr) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_sched_setattr, pid, attr, flags);
#else
return (int)shim_enosys(0, pid, attr, flags);
#endif
}
/*
* shim_mlock()
* wrapper for mlock(2) - lock memory
*/
int shim_mlock(const void *addr, size_t len)
{
#if defined(HAVE_MLOCK)
return mlock(shim_unconstify_ptr(addr), len);
#elif defined(__NR_mlock) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_mlock, addr, len);
#else
return (int)shim_enosys(0, addr, len);
#endif
}
/*
* shim_munlock()
* wrapper for munlock(2) - unlock memory
*/
int shim_munlock(const void *addr, size_t len)
{
#if defined(HAVE_MUNLOCK)
return munlock(shim_unconstify_ptr(addr), len);
#elif defined(__NR_munlock) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_munlock, addr, len);
#else
return (int)shim_enosys(0, addr, len);
#endif
}
/*
* shim_mlock2()
* wrapper for mlock2(2) - lock memory; force call
* via syscall if possible as zero flags call goes
* via mlock() in libc or mlock2() for non-zero flags.
*/
int shim_mlock2(const void *addr, size_t len, int flags)
{
#if defined(__NR_mlock2) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_mlock2, addr, len, flags);
#elif defined(HAVE_MLOCK2)
return mlock2(addr, len, flags);
#else
return (int)shim_enosys(0, addr, len, flags);
#endif
}
/*
* shim_mlockall()
* wrapper for mlockall() - lock all memory
*/
int shim_mlockall(int flags)
{
#if defined(HAVE_MLOCKALL)
return mlockall(flags);
#elif defined(__NR_mlockall) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_mlockall, flags);
#else
return (int)shim_enosys(0, flags);
#endif
}
/*
* shim_munlockall()
* wrapper for munlockall() - unlock all memory
*/
int shim_munlockall(void)
{
#if defined(HAVE_MUNLOCKALL)
return munlockall();
#elif defined(__NR_munlockall) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_munlockall);
#else
return (int)shim_enosys(0);
#endif
}
/*
* shim_nanosleep_uint64()
* nanosecond sleep that handles being interrupted but will
* be preempted if an ALARM signal has triggered a termination
*/
int shim_nanosleep_uint64(uint64_t nsec)
{
#if defined(HAVE_NANOSLEEP)
struct timespec t, trem;
t.tv_sec = nsec / STRESS_NANOSECOND;
t.tv_nsec = nsec % STRESS_NANOSECOND;
for (;;) {
errno = 0;
if (nanosleep(&t, &trem) < 0) {
if (errno == EINTR) {
t = trem;
if (keep_stressing_flag())
continue;
} else {
return -1;
}
}
break;
}
#else
useconds_t usec = nsec / 1000;
const double t_end = stress_time_now() + (((double)usec) * ONE_MILLIONTH);
for (;;) {
errno = 0;
if (usleep(usec) < 0) {
if (errno == EINTR) {
const double t_left = t_end - stress_time_now();
if (t_left < 0.0)
return 0;
usec = (useconds_t)(t_left * STRESS_DBL_MICROSECOND);
if (usec == 0)
return 0;
if (keep_stressing_flag())
continue;
} else {
return -1;
}
}
break;
}
#endif
return 0;
}
/*
* shim_usleep()
* usleep is now deprecated, so
* emulate it with nanosleep
*/
int shim_usleep(uint64_t usec)
{
return shim_nanosleep_uint64(usec * 1000);
}
/*
* shim_usleep_interruptible()
* interruptible usleep
*/
int shim_usleep_interruptible(uint64_t usec)
{
#if defined(HAVE_NANOSLEEP)
struct timespec t, trem;
t.tv_sec = (time_t)((double)usec * ONE_MILLIONTH);
t.tv_nsec = ((long int)usec - (t.tv_sec * 1000000)) * 1000;
errno = 0;
return nanosleep(&t, &trem);
#else
return usleep((useconds_t)usec);
#endif
}
/*
* shim_getlogin
* a more secure abstracted version of getlogin
*
* According to flawfinder:
* "It's often easy to fool getlogin. Sometimes it does not work at all,
* because some program messed up the utmp file. Often, it gives only the
* first 8 characters of the login name. The user currently logged in on the
* controlling tty of our program need not be the user who started it. Avoid
* getlogin() for security-related purposes (CWE-807). Use getpwuid(geteuid())
* and extract the desired information instead."
*/
char *shim_getlogin(void)
{
#if defined(BUILD_STATIC)
/*
* static builds can't use getpwuid because of
* dynamic linking issues. Ugh.
*/
return NULL;
#else
static char pw_name[256];
const struct passwd *pw = getpwuid(geteuid());
if (!pw)
return NULL;
(void)shim_strlcpy(pw_name, pw->pw_name, sizeof(pw_name));
pw_name[sizeof(pw_name) - 1 ] = '\0';
return pw_name;
#endif
}
/*
* shim_msync()
* wrapper for msync(2) - synchronize a file with a memory map
*/
int shim_msync(void *addr, size_t length, int flags)
{
#if defined(HAVE_MSYNC)
return msync(addr, length, flags);
#elif defined(__NR_msync) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_msync, addr, length, flags);
#else
return (int)shim_enosys(0, addr, length, flags);
#endif
}
/*
* shim_sysfs()
* wrapper for sysfs(2) - get filesystem type information
*/
int shim_sysfs(int option, ...)
{
#if defined(__NR_sysfs) && \
defined(HAVE_SYSCALL)
int ret;
va_list ap;
char *fsname;
unsigned int fs_index;
char *buf;
va_start(ap, option);
switch (option) {
case 1:
fsname = va_arg(ap, char *);
ret = (int)syscall(__NR_sysfs, option, fsname);
break;
case 2:
fs_index = va_arg(ap, unsigned int);
buf = va_arg(ap, char *);
ret = (int)syscall(__NR_sysfs, option, fs_index, buf);
break;
case 3:
ret = (int)syscall(__NR_sysfs, option);
break;
default:
ret = -1;
errno = EINVAL;
}
va_end(ap);
return ret;
#else
return (int)shim_enosys(0, option);
#endif
}
/*
* shim_madvise()
* wrapper for madvise(2) - get filesystem type information
*/
int shim_madvise(void *addr, size_t length, int advice)
{
#if defined(HAVE_MADVISE)
return (int)madvise(addr, length, advice);
#elif defined(__NR_madvise) && \
defined(HAVE_SYSCALL)
return (int)syscall(__NR_madvise, addr, length, advice);
#elif defined(HAVE_POSIX_MADVISE)
int posix_advice;
switch (advice) {
#if defined(POSIX_MADV_NORMAL) && \
defined(MADV_NORMAL)
case MADV_NORMAL:
posix_advice = POSIX_MADV_NORMAL;
break;
#endif
#if defined(POSIX_MADV_SEQUENTIAL) && \
defined(MADV_SEQUENTIAL)
case MADV_SEQUENTIAL:
posix_advice = POSIX_MADV_SEQUENTIAL;
break;
#endif
#if defined(POSIX_MADV_RANDOM) && \
defined(MADV_RANDOM)
case MADV_RANDOM:
posix_advice = POSIX_MADV_RANDOM;
break;
#endif
#if defined(POSIX_MADV_WILLNEED) && \
defined(MADV_WILLNEED)
case MADV_WILLNEED:
posix_advice = POSIX_MADV_WILLNEED;
break;
#endif
#if defined(POSIX_MADV_DONTNEED) && \
defined(MADV_DONTNEED)
case MADV_DONTNEED: