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#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/mman.h>
#include <bits/ensure.h>
#include <mlibc/debug.hpp>
#include <mlibc/posix-sysdeps.hpp>
int mprotect(void *pointer, size_t size, int prot) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_vm_protect, -1);
if(int e = mlibc::sys_vm_protect(pointer, size, prot); e) {
errno = e;
return -1;
}
return 0;
}
int mlock(const void *addr, size_t len) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_mlock, -1);
if(int e = mlibc::sys_mlock(addr, len); e) {
errno = e;
return -1;
}
return 0;
}
int mlockall(int flags) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_mlockall, -1);
if(int e = mlibc::sys_mlockall(flags); e) {
errno = e;
return -1;
}
return 0;
}
int munlock(const void *addr, size_t len) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_munlock, -1);
if(int e = mlibc::sys_munlock(addr, len); e) {
errno = e;
return -1;
}
return 0;
}
int munlockall(void) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_munlockall, -1);
if(int e = mlibc::sys_munlockall(); e) {
errno = e;
return -1;
}
return 0;
}
int posix_madvise(void *, size_t, int) {
mlibc::infoLogger() << "\e[31m" "mlibc: posix_madvise() fails unconditionally" "\e[39m"
<< frg::endlog;
return ENOSYS;
}
int msync(void *addr, size_t length, int flags) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_msync, -1);
if(int e = mlibc::sys_msync(addr, length, flags); e) {
errno = e;
return -1;
}
return 0;
}
void *mremap(void *pointer, size_t size, size_t new_size, int flags, ...) {
__ensure(flags == MREMAP_MAYMOVE);
void *window;
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_vm_remap, (void *)-1);
if(int e = mlibc::sys_vm_remap(pointer, size, new_size, &window); e) {
errno = e;
return (void *)-1;
}
return window;
}
int remap_file_pages(void *, size_t, int, size_t, int) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
void *mmap(void *hint, size_t size, int prot, int flags, int fd, off_t offset) {
void *window;
if(int e = mlibc::sys_vm_map(hint, size, prot, flags, fd, offset, &window); e) {
errno = e;
return (void *)-1;
}
return window;
}
int munmap(void *pointer, size_t size) {
if(int e = mlibc::sys_vm_unmap(pointer, size); e) {
errno = e;
return -1;
}
return 0;
}
// The implementation of shm_open and shm_unlink is taken from musl.
namespace {
char *shm_mapname(const char *name, char *buf) {
char *p;
while(*name == '/')
name++;
if(*(p = strchrnul(name, '/')) || p == name ||
(p - name <= 2 && name[0] == '.' && p[-1] == '.')) {
errno = EINVAL;
return 0;
}
if(p - name > NAME_MAX) {
errno = ENAMETOOLONG;
return 0;
}
memcpy(buf, "/dev/shm/", 9);
memcpy(buf + 9, name, p - name + 1);
return buf;
}
}
int shm_open(const char *name, int flags, mode_t mode) {
int cs;
char buf[NAME_MAX + 10];
if(!(name = shm_mapname(name, buf)))
return -1;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
int fd = open(name, flags | O_NOFOLLOW | O_CLOEXEC | O_NONBLOCK, mode);
pthread_setcancelstate(cs, 0);
return fd;
}
int shm_unlink(const char *name) {
char buf[NAME_MAX + 10];
if(!(name = shm_mapname(name, buf)))
return -1;
return unlink(name);
}
#if __MLIBC_LINUX_OPTION
int memfd_create(const char *name, unsigned int flags) {
int ret = -1;
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_memfd_create, -1);
if(int e = mlibc::sys_memfd_create(name, flags, &ret)) {
errno = e;
return -1;
}
return ret;
}
int madvise(void *addr, size_t length, int advice) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_madvise, -1);
if(int e = mlibc::sys_madvise(addr, length, advice)) {
errno = e;
return -1;
}
return 0;
}
int mincore(void *addr, size_t length, unsigned char *vec) {
MLIBC_CHECK_OR_ENOSYS(mlibc::sys_munlockall, -1);
if(int e = mlibc::sys_mincore(addr, length, vec); e) {
errno = e;
return -1;
}
return 0;
}
#endif /* __MLIBC_LINUX_OPTION */
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