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|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "pal_config.h"
#include "pal_errno.h"
#include "pal_io.h"
#include "pal_utilities.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>
#include <limits.h>
#if HAVE_FCOPYFILE
#include <copyfile.h>
#elif HAVE_SENDFILE
#include <sys/sendfile.h>
#endif
#if HAVE_INOTIFY
#include <sys/inotify.h>
#endif
#if HAVE_STAT64
#define stat_ stat64
#define fstat_ fstat64
#define lstat_ lstat64
#else
#define stat_ stat
#define fstat_ fstat
#define lstat_ lstat
#endif
// These numeric values are specified by POSIX.
// Validate that our definitions match.
static_assert(PAL_S_IRWXU == S_IRWXU, "");
static_assert(PAL_S_IRUSR == S_IRUSR, "");
static_assert(PAL_S_IWUSR == S_IWUSR, "");
static_assert(PAL_S_IXUSR == S_IXUSR, "");
static_assert(PAL_S_IRWXG == S_IRWXG, "");
static_assert(PAL_S_IRGRP == S_IRGRP, "");
static_assert(PAL_S_IWGRP == S_IWGRP, "");
static_assert(PAL_S_IXGRP == S_IXGRP, "");
static_assert(PAL_S_IRWXO == S_IRWXO, "");
static_assert(PAL_S_IROTH == S_IROTH, "");
static_assert(PAL_S_IWOTH == S_IWOTH, "");
static_assert(PAL_S_IXOTH == S_IXOTH, "");
static_assert(PAL_S_ISUID == S_ISUID, "");
static_assert(PAL_S_ISGID == S_ISGID, "");
// These numeric values are not specified by POSIX, but the values
// are common to our current targets. If these static asserts fail,
// ConvertFileStatus needs to be updated to twiddle mode bits
// accordingly.
static_assert(PAL_S_IFMT == S_IFMT, "");
static_assert(PAL_S_IFIFO == S_IFIFO, "");
static_assert(PAL_S_IFCHR == S_IFCHR, "");
static_assert(PAL_S_IFDIR == S_IFDIR, "");
static_assert(PAL_S_IFREG == S_IFREG, "");
static_assert(PAL_S_IFLNK == S_IFLNK, "");
static_assert(PAL_S_IFSOCK == S_IFSOCK, "");
// Validate that our enum for inode types is the same as what is
// declared by the dirent.h header on the local system.
static_assert(PAL_DT_UNKNOWN == DT_UNKNOWN, "");
static_assert(PAL_DT_FIFO == DT_FIFO, "");
static_assert(PAL_DT_CHR == DT_CHR, "");
static_assert(PAL_DT_DIR == DT_DIR, "");
static_assert(PAL_DT_BLK == DT_BLK, "");
static_assert(PAL_DT_REG == DT_REG, "");
static_assert(PAL_DT_LNK == DT_LNK, "");
static_assert(PAL_DT_SOCK == DT_SOCK, "");
static_assert(PAL_DT_WHT == DT_WHT, "");
// Validate that our Lock enum value are correct for the platform
static_assert(PAL_LOCK_SH == LOCK_SH, "");
static_assert(PAL_LOCK_EX == LOCK_EX, "");
static_assert(PAL_LOCK_NB == LOCK_NB, "");
static_assert(PAL_LOCK_UN == LOCK_UN, "");
// Validate our AccessMode enum values are correct for the platform
static_assert(PAL_F_OK == F_OK, "");
static_assert(PAL_X_OK == X_OK, "");
static_assert(PAL_W_OK == W_OK, "");
static_assert(PAL_R_OK == R_OK, "");
// Validate our SeekWhence enum values are correct for the platform
static_assert(PAL_SEEK_SET == SEEK_SET, "");
static_assert(PAL_SEEK_CUR == SEEK_CUR, "");
static_assert(PAL_SEEK_END == SEEK_END, "");
// Validate our PollFlags enum values are correct for the platform
static_assert(PAL_POLLIN == POLLIN, "");
static_assert(PAL_POLLPRI == POLLPRI, "");
static_assert(PAL_POLLOUT == POLLOUT, "");
static_assert(PAL_POLLERR == POLLERR, "");
static_assert(PAL_POLLHUP == POLLHUP, "");
static_assert(PAL_POLLNVAL == POLLNVAL, "");
// Validate our FileAdvice enum values are correct for the platform
#if HAVE_POSIX_ADVISE
static_assert(PAL_POSIX_FADV_NORMAL == POSIX_FADV_NORMAL, "");
static_assert(PAL_POSIX_FADV_RANDOM == POSIX_FADV_RANDOM, "");
static_assert(PAL_POSIX_FADV_SEQUENTIAL == POSIX_FADV_SEQUENTIAL, "");
static_assert(PAL_POSIX_FADV_WILLNEED == POSIX_FADV_WILLNEED, "");
static_assert(PAL_POSIX_FADV_DONTNEED == POSIX_FADV_DONTNEED, "");
static_assert(PAL_POSIX_FADV_NOREUSE == POSIX_FADV_NOREUSE, "");
#endif
// Validate our NotifyEvents enum values are correct for the platform
#if HAVE_INOTIFY
static_assert(PAL_IN_ACCESS == IN_ACCESS, "");
static_assert(PAL_IN_MODIFY == IN_MODIFY, "");
static_assert(PAL_IN_ATTRIB == IN_ATTRIB, "");
static_assert(PAL_IN_MOVED_FROM == IN_MOVED_FROM, "");
static_assert(PAL_IN_MOVED_TO == IN_MOVED_TO, "");
static_assert(PAL_IN_CREATE == IN_CREATE, "");
static_assert(PAL_IN_DELETE == IN_DELETE, "");
static_assert(PAL_IN_Q_OVERFLOW == IN_Q_OVERFLOW, "");
static_assert(PAL_IN_IGNORED == IN_IGNORED, "");
static_assert(PAL_IN_ONLYDIR == IN_ONLYDIR, "");
static_assert(PAL_IN_DONT_FOLLOW == IN_DONT_FOLLOW, "");
static_assert(PAL_IN_EXCL_UNLINK == IN_EXCL_UNLINK, "");
static_assert(PAL_IN_ISDIR == IN_ISDIR, "");
#endif
static void ConvertFileStatus(const struct stat_& src, FileStatus* dst)
{
dst->Flags = FILESTATUS_FLAGS_NONE;
dst->Mode = static_cast<int32_t>(src.st_mode);
dst->Uid = src.st_uid;
dst->Gid = src.st_gid;
dst->Size = src.st_size;
dst->ATime = src.st_atime;
dst->MTime = src.st_mtime;
dst->CTime = src.st_ctime;
#if HAVE_STAT_BIRTHTIME
dst->BirthTime = src.st_birthtime;
dst->Flags |= FILESTATUS_FLAGS_HAS_BIRTHTIME;
#else
dst->BirthTime = 0;
#endif
}
extern "C" int32_t SystemNative_Stat(const char* path, FileStatus* output)
{
struct stat_ result;
int ret;
while (CheckInterrupted(ret = stat_(path, &result)));
if (ret == 0)
{
ConvertFileStatus(result, output);
}
return ret;
}
extern "C" int32_t SystemNative_FStat(intptr_t fd, FileStatus* output)
{
struct stat_ result;
int ret;
while (CheckInterrupted(ret = fstat_(ToFileDescriptor(fd), &result)));
if (ret == 0)
{
ConvertFileStatus(result, output);
}
return ret;
}
extern "C" int32_t SystemNative_LStat(const char* path, FileStatus* output)
{
struct stat_ result;
int ret = lstat_(path, &result);
if (ret == 0)
{
ConvertFileStatus(result, output);
}
return ret;
}
static int32_t ConvertOpenFlags(int32_t flags)
{
int32_t ret;
switch (flags & PAL_O_ACCESS_MODE_MASK)
{
case PAL_O_RDONLY:
ret = O_RDONLY;
break;
case PAL_O_RDWR:
ret = O_RDWR;
break;
case PAL_O_WRONLY:
ret = O_WRONLY;
break;
default:
assert(false && "Unknown Open access mode.");
return -1;
}
if (flags & ~(PAL_O_ACCESS_MODE_MASK | PAL_O_CLOEXEC | PAL_O_CREAT | PAL_O_EXCL | PAL_O_TRUNC | PAL_O_SYNC))
{
assert(false && "Unknown Open flag.");
return -1;
}
if (flags & PAL_O_CLOEXEC)
ret |= O_CLOEXEC;
if (flags & PAL_O_CREAT)
ret |= O_CREAT;
if (flags & PAL_O_EXCL)
ret |= O_EXCL;
if (flags & PAL_O_TRUNC)
ret |= O_TRUNC;
if (flags & PAL_O_SYNC)
ret |= O_SYNC;
assert(ret != -1);
return ret;
}
extern "C" intptr_t SystemNative_Open(const char* path, int32_t flags, int32_t mode)
{
flags = ConvertOpenFlags(flags);
if (flags == -1)
{
errno = EINVAL;
return -1;
}
int result;
while (CheckInterrupted(result = open(path, flags, static_cast<mode_t>(mode))));
return result;
}
extern "C" int32_t SystemNative_Close(intptr_t fd)
{
return close(ToFileDescriptor(fd));
}
extern "C" intptr_t SystemNative_Dup(intptr_t oldfd)
{
int result;
while (CheckInterrupted(result = dup(ToFileDescriptor(oldfd))));
return result;
}
extern "C" int32_t SystemNative_Unlink(const char* path)
{
int32_t result;
while (CheckInterrupted(result = unlink(path)));
return result;
}
extern "C" intptr_t SystemNative_ShmOpen(const char* name, int32_t flags, int32_t mode)
{
#if HAVE_SHM_OPEN_THAT_WORKS_WELL_ENOUGH_WITH_MMAP
flags = ConvertOpenFlags(flags);
if (flags == -1)
{
errno = EINVAL;
return -1;
}
return shm_open(name, flags, static_cast<mode_t>(mode));
#else
(void)name, (void)flags, (void)mode;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_ShmUnlink(const char* name)
{
int32_t result;
while (CheckInterrupted(result = shm_unlink(name)));
return result;
}
static void ConvertDirent(const dirent& entry, DirectoryEntry* outputEntry)
{
// We use Marshal.PtrToStringAnsi on the managed side, which takes a pointer to
// the start of the unmanaged string. Give the caller back a pointer to the
// location of the start of the string that exists in their own byte buffer.
outputEntry->Name = entry.d_name;
outputEntry->InodeType = static_cast<NodeType>(entry.d_type);
#if HAVE_DIRENT_NAME_LEN
outputEntry->NameLength = entry.d_namlen;
#else
outputEntry->NameLength = -1; // sentinel value to mean we have to walk to find the first \0
#endif
}
extern "C" int32_t SystemNative_GetDirentSize()
{
// dirent should be under 2k in size
static_assert(sizeof(dirent) < 2048, "");
return sizeof(dirent);
}
// To reduce the number of string copies, this function calling pattern works as follows:
// 1) The managed code calls GetDirentSize() to get the platform-specific
// size of the dirent struct.
// 2) The managed code creates a byte[] buffer of the size of the native dirent
// and passes a pointer to this buffer to this function.
// 3) This function passes input byte[] buffer to the OS to fill with dirent data
// which makes the 1st strcpy.
// 4) The ConvertDirent function will set a pointer to the start of the inode name
// in the byte[] buffer so the managed code and find it and copy it out of the
// buffer into a managed string that the caller of the framework can use, making
// the 2nd and final strcpy.
extern "C" int32_t SystemNative_ReadDirR(DIR* dir, void* buffer, int32_t bufferSize, DirectoryEntry* outputEntry)
{
assert(buffer != nullptr);
assert(dir != nullptr);
assert(outputEntry != nullptr);
if (bufferSize < static_cast<int32_t>(sizeof(dirent)))
{
assert(false && "Buffer size too small; use GetDirentSize to get required buffer size");
return ERANGE;
}
dirent* result = nullptr;
dirent* entry = static_cast<dirent*>(buffer);
int error = readdir_r(dir, entry, &result);
// positive error number returned -> failure
if (error != 0)
{
assert(error > 0);
*outputEntry = {}; // managed out param must be initialized
return error;
}
// 0 returned with null result -> end-of-stream
if (result == nullptr)
{
*outputEntry = {}; // managed out param must be initialized
return -1; // shim convention for end-of-stream
}
// 0 returned with non-null result (guaranteed to be set to entry arg) -> success
assert(result == entry);
ConvertDirent(*entry, outputEntry);
return 0;
}
extern "C" DIR* SystemNative_OpenDir(const char* path)
{
return opendir(path);
}
extern "C" int32_t SystemNative_CloseDir(DIR* dir)
{
return closedir(dir);
}
extern "C" int32_t SystemNative_Pipe(int32_t pipeFds[2], int32_t flags)
{
switch (flags)
{
case 0:
break;
case PAL_O_CLOEXEC:
flags = O_CLOEXEC;
break;
default:
assert(false && "Unknown flag.");
errno = EINVAL;
return -1;
}
int32_t result;
#if HAVE_PIPE2
// If pipe2 is available, use it. This will handle O_CLOEXEC if it was set.
while (CheckInterrupted(result = pipe2(pipeFds, flags)));
#else
// Otherwise, use pipe.
while (CheckInterrupted(result = pipe(pipeFds)));
// Then, if O_CLOEXEC was specified, use fcntl to configure the file descriptors appropriately.
if ((flags & O_CLOEXEC) != 0 && result == 0)
{
while (CheckInterrupted(result = fcntl(pipeFds[0], F_SETFD, FD_CLOEXEC)));
if (result == 0)
{
while (CheckInterrupted(result = fcntl(pipeFds[1], F_SETFD, FD_CLOEXEC)));
}
if (result != 0)
{
int tmpErrno = errno;
close(pipeFds[0]);
close(pipeFds[1]);
errno = tmpErrno;
}
}
#endif
return result;
}
extern "C" int32_t SystemNative_FcntlSetCloseOnExec(intptr_t fd)
{
int result;
while (CheckInterrupted(result = fcntl(ToFileDescriptor(fd), F_SETFD, FD_CLOEXEC)));
return result;
}
extern "C" int32_t SystemNative_FcntlCanGetSetPipeSz()
{
#if defined(F_GETPIPE_SZ) && defined(F_SETPIPE_SZ)
return true;
#else
return false;
#endif
}
extern "C" int32_t SystemNative_FcntlGetPipeSz(intptr_t fd)
{
#ifdef F_GETPIPE_SZ
int32_t result;
while (CheckInterrupted(result = fcntl(ToFileDescriptor(fd), F_GETPIPE_SZ)));
return result;
#else
(void)fd;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_FcntlSetPipeSz(intptr_t fd, int32_t size)
{
#ifdef F_SETPIPE_SZ
int32_t result;
while (CheckInterrupted(result = fcntl(ToFileDescriptor(fd), F_SETPIPE_SZ, size)));
return result;
#else
(void)fd, (void)size;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_FcntlSetIsNonBlocking(intptr_t fd, int32_t isNonBlocking)
{
int fileDescriptor = ToFileDescriptor(fd);
int flags = fcntl(fileDescriptor, F_GETFL);
if (flags == -1)
{
return -1;
}
if (isNonBlocking == 0)
{
flags &= ~O_NONBLOCK;
}
else
{
flags |= O_NONBLOCK;
}
return fcntl(fileDescriptor, F_SETFL, flags);
}
extern "C" int32_t SystemNative_MkDir(const char* path, int32_t mode)
{
int32_t result;
while (CheckInterrupted(result = mkdir(path, static_cast<mode_t>(mode))));
return result;
}
extern "C" int32_t SystemNative_ChMod(const char* path, int32_t mode)
{
int32_t result;
while (CheckInterrupted(result = chmod(path, static_cast<mode_t>(mode))));
return result;
}
extern "C" int32_t SystemNative_FChMod(intptr_t fd, int32_t mode)
{
int32_t result;
while (CheckInterrupted(result = fchmod(ToFileDescriptor(fd), static_cast<mode_t>(mode))));
return result;
}
extern "C" int32_t SystemNative_FSync(intptr_t fd)
{
int32_t result;
while (CheckInterrupted(result = fsync(ToFileDescriptor(fd))));
return result;
}
extern "C" int32_t SystemNative_FLock(intptr_t fd, LockOperations operation)
{
int32_t result;
while (CheckInterrupted(result = flock(ToFileDescriptor(fd), operation)));
return result;
}
extern "C" int32_t SystemNative_ChDir(const char* path)
{
int32_t result;
while (CheckInterrupted(result = chdir(path)));
return result;
}
extern "C" int32_t SystemNative_Access(const char* path, AccessMode mode)
{
return access(path, mode);
}
extern "C" int32_t SystemNative_FnMatch(const char* pattern, const char* path, FnMatchFlags flags)
{
return fnmatch(pattern, path, flags);
}
extern "C" int64_t SystemNative_LSeek(intptr_t fd, int64_t offset, SeekWhence whence)
{
int64_t result;
while (CheckInterrupted(result = lseek(ToFileDescriptor(fd), offset, whence)));
return result;
}
extern "C" int32_t SystemNative_Link(const char* source, const char* linkTarget)
{
int32_t result;
while (CheckInterrupted(result = link(source, linkTarget)));
return result;
}
extern "C" intptr_t SystemNative_MksTemps(char* pathTemplate, int32_t suffixLength)
{
intptr_t result;
while (CheckInterrupted(result = mkstemps(pathTemplate, suffixLength)));
return result;
}
static int32_t ConvertMMapProtection(int32_t protection)
{
if (protection == PAL_PROT_NONE)
return PROT_NONE;
if (protection & ~(PAL_PROT_READ | PAL_PROT_WRITE | PAL_PROT_EXEC))
{
assert(false && "Unknown protection.");
return -1;
}
int32_t ret = 0;
if (protection & PAL_PROT_READ)
ret |= PROT_READ;
if (protection & PAL_PROT_WRITE)
ret |= PROT_WRITE;
if (protection & PAL_PROT_EXEC)
ret |= PROT_EXEC;
assert(ret != -1);
return ret;
}
static int32_t ConvertMMapFlags(int32_t flags)
{
if (flags & ~(PAL_MAP_SHARED | PAL_MAP_PRIVATE | PAL_MAP_ANONYMOUS))
{
assert(false && "Unknown MMap flag.");
return -1;
}
int32_t ret = 0;
if (flags & PAL_MAP_PRIVATE)
ret |= MAP_PRIVATE;
if (flags & PAL_MAP_SHARED)
ret |= MAP_SHARED;
if (flags & PAL_MAP_ANONYMOUS)
ret |= MAP_ANON;
assert(ret != -1);
return ret;
}
static int32_t ConvertMSyncFlags(int32_t flags)
{
if (flags & ~(PAL_MS_SYNC | PAL_MS_ASYNC | PAL_MS_INVALIDATE))
{
assert(false && "Unknown MSync flag.");
return -1;
}
int32_t ret = 0;
if (flags & PAL_MS_SYNC)
ret |= MS_SYNC;
if (flags & PAL_MS_ASYNC)
ret |= MS_ASYNC;
if (flags & PAL_MS_INVALIDATE)
ret |= MS_INVALIDATE;
assert(ret != -1);
return ret;
}
extern "C" void* SystemNative_MMap(void* address,
uint64_t length,
int32_t protection, // bitwise OR of PAL_PROT_*
int32_t flags, // bitwise OR of PAL_MAP_*, but PRIVATE and SHARED are mutually exclusive.
intptr_t fd,
int64_t offset)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return nullptr;
}
protection = ConvertMMapProtection(protection);
flags = ConvertMMapFlags(flags);
if (flags == -1 || protection == -1)
{
errno = EINVAL;
return nullptr;
}
// Use ToFileDescriptorUnchecked to allow -1 to be passed for the file descriptor, since managed code explicitly uses -1
void* ret = mmap(address, static_cast<size_t>(length), protection, flags, ToFileDescriptorUnchecked(fd), offset);
if (ret == MAP_FAILED)
{
return nullptr;
}
assert(ret != nullptr);
return ret;
}
extern "C" int32_t SystemNative_MUnmap(void* address, uint64_t length)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
return munmap(address, static_cast<size_t>(length));
}
extern "C" int32_t SystemNative_MAdvise(void* address, uint64_t length, MemoryAdvice advice)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
switch (advice)
{
case PAL_MADV_DONTFORK:
#ifdef MADV_DONTFORK
return madvise(address, static_cast<size_t>(length), MADV_DONTFORK);
#else
(void)address, (void)length, (void)advice;
errno = ENOTSUP;
return -1;
#endif
}
assert(false && "Unknown MemoryAdvice");
errno = EINVAL;
return -1;
}
extern "C" int32_t SystemNative_MLock(void* address, uint64_t length)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
return mlock(address, static_cast<size_t>(length));
}
extern "C" int32_t SystemNative_MUnlock(void* address, uint64_t length)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
return munlock(address, static_cast<size_t>(length));
}
extern "C" int32_t SystemNative_MProtect(void* address, uint64_t length, int32_t protection)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
protection = ConvertMMapProtection(protection);
if (protection == -1)
{
errno = EINVAL;
return -1;
}
return mprotect(address, static_cast<size_t>(length), protection);
}
extern "C" int32_t SystemNative_MSync(void* address, uint64_t length, int32_t flags)
{
if (length > SIZE_MAX)
{
errno = ERANGE;
return -1;
}
flags = ConvertMSyncFlags(flags);
if (flags == -1)
{
errno = EINVAL;
return -1;
}
return msync(address, static_cast<size_t>(length), flags);
}
extern "C" int64_t SystemNative_SysConf(SysConfName name)
{
switch (name)
{
case PAL_SC_CLK_TCK:
return sysconf(_SC_CLK_TCK);
case PAL_SC_PAGESIZE:
return sysconf(_SC_PAGESIZE);
case PAL_SC_NPROCESSORS_ONLN:
return sysconf(_SC_NPROCESSORS_ONLN);
}
assert(false && "Unknown SysConfName");
errno = EINVAL;
return -1;
}
extern "C" int32_t SystemNative_FTruncate(intptr_t fd, int64_t length)
{
int32_t result;
while (CheckInterrupted(result = ftruncate(ToFileDescriptor(fd), length)));
return result;
}
extern "C" Error SystemNative_Poll(PollEvent* pollEvents, uint32_t eventCount, int32_t milliseconds, uint32_t* triggered)
{
if (pollEvents == nullptr || triggered == nullptr)
{
return PAL_EFAULT;
}
if (milliseconds < -1)
{
return PAL_EINVAL;
}
size_t bufferSize = sizeof(pollfd) * static_cast<size_t>(eventCount);
bool useStackBuffer = bufferSize <= 2048;
pollfd* pollfds = reinterpret_cast<pollfd*>(useStackBuffer ? alloca(bufferSize) : malloc(bufferSize));
for (uint32_t i = 0; i < eventCount; i++)
{
const PollEvent& event = pollEvents[i];
pollfds[i] = { .fd = event.FileDescriptor, .events = event.Events, .revents = 0 };
}
int rv;
while (CheckInterrupted(rv = poll(pollfds, static_cast<nfds_t>(eventCount), milliseconds)));
if (rv < 0)
{
if (!useStackBuffer)
{
free(pollfds);
}
*triggered = 0;
return SystemNative_ConvertErrorPlatformToPal(errno);
}
for (uint32_t i = 0; i < eventCount; i++)
{
const pollfd& pfd = pollfds[i];
assert(pfd.fd == pollEvents[i].FileDescriptor);
assert(pfd.events == pollEvents[i].Events);
pollEvents[i].TriggeredEvents = static_cast<PollEvents>(pfd.revents);
}
*triggered = static_cast<uint32_t>(rv);
if (!useStackBuffer)
{
free(pollfds);
}
return PAL_SUCCESS;
}
extern "C" int32_t SystemNative_PosixFAdvise(intptr_t fd, int64_t offset, int64_t length, FileAdvice advice)
{
#if HAVE_POSIX_ADVISE
int32_t result;
while (CheckInterrupted(result = posix_fadvise(ToFileDescriptor(fd), offset, length, advice)));
return result;
#else
// Not supported on this platform. Caller can ignore this failure since it's just a hint.
(void)fd, (void)offset, (void)length, (void)advice;
return ENOTSUP;
#endif
}
extern "C" char* SystemNative_GetLine(FILE* stream)
{
assert(stream != nullptr);
char* lineptr = nullptr;
size_t n = 0;
ssize_t length = getline(&lineptr, &n, stream);
return length >= 0 ? lineptr : nullptr;
}
extern "C" int32_t SystemNative_Read(intptr_t fd, void* buffer, int32_t bufferSize)
{
assert(buffer != nullptr || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = EINVAL;
return -1;
}
ssize_t count;
while (CheckInterrupted(count = read(ToFileDescriptor(fd), buffer, UnsignedCast(bufferSize))));
assert(count >= -1 && count <= bufferSize);
return static_cast<int32_t>(count);
}
extern "C" int32_t SystemNative_ReadLink(const char* path, char* buffer, int32_t bufferSize)
{
assert(buffer != nullptr || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = EINVAL;
return -1;
}
ssize_t count = readlink(path, buffer, static_cast<size_t>(bufferSize));
assert(count >= -1 && count <= bufferSize);
return static_cast<int32_t>(count);
}
extern "C" int32_t SystemNative_Rename(const char* oldPath, const char* newPath)
{
int32_t result;
while (CheckInterrupted(result = rename(oldPath, newPath)));
return result;
}
extern "C" int32_t SystemNative_RmDir(const char* path)
{
int32_t result;
while (CheckInterrupted(result = rmdir(path)));
return result;
}
extern "C" void SystemNative_Sync()
{
sync();
}
extern "C" int32_t SystemNative_Write(intptr_t fd, const void* buffer, int32_t bufferSize)
{
assert(buffer != nullptr || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = ERANGE;
return -1;
}
ssize_t count;
while (CheckInterrupted(count = write(ToFileDescriptor(fd), buffer, UnsignedCast(bufferSize))));
assert(count >= -1 && count <= bufferSize);
return static_cast<int32_t>(count);
}
#if !HAVE_FCOPYFILE
// Read all data from inFd and write it to outFd
static int32_t CopyFile_ReadWrite(int inFd, int outFd)
{
// Allocate a buffer
const int BufferLength = 80 * 1024 * sizeof(char);
char* buffer = reinterpret_cast<char*>(malloc(BufferLength));
if (buffer == nullptr)
{
return -1;
}
// Repeatedly read from the source and write to the destination
while (true)
{
// Read up to what will fit in our buffer. We're done if we get back 0 bytes.
ssize_t bytesRead;
while (CheckInterrupted(bytesRead = read(inFd, buffer, BufferLength)));
if (bytesRead == -1)
{
int tmp = errno;
free(buffer);
errno = tmp;
return -1;
}
if (bytesRead == 0)
{
break;
}
assert(bytesRead > 0);
// Write what was read.
ssize_t offset = 0;
while (bytesRead > 0)
{
ssize_t bytesWritten;
while (CheckInterrupted(bytesWritten = write(outFd, buffer + offset, static_cast<size_t>(bytesRead))));
if (bytesWritten == -1)
{
int tmp = errno;
free(buffer);
errno = tmp;
return -1;
}
assert(bytesWritten >= 0);
bytesRead -= bytesWritten;
offset += bytesWritten;
}
}
free(buffer);
return 0;
}
#endif // !HAVE_FCOPYFILE
extern "C" int32_t SystemNative_CopyFile(intptr_t sourceFd, intptr_t destinationFd)
{
int inFd = ToFileDescriptor(sourceFd);
int outFd = ToFileDescriptor(destinationFd);
#if HAVE_FCOPYFILE
// If fcopyfile is available (OS X), try to use it, as the whole copy
// can be performed in the kernel, without lots of unnecessary copying.
// Copy data and metadata.
return fcopyfile(inFd, outFd, nullptr, COPYFILE_ALL) == 0 ? 0 : -1;
#else
// Get the stats on the source file.
int ret;
struct stat_ sourceStat;
bool copied = false;
#if HAVE_SENDFILE
// If sendfile is available (Linux), try to use it, as the whole copy
// can be performed in the kernel, without lots of unnecessary copying.
while (CheckInterrupted(ret = fstat_(inFd, &sourceStat)));
if (ret != 0)
{
return -1;
}
// We use `auto' here to adapt the type of `size' depending on the running platform.
// On 32-bit, if you use 64-bit offsets, the last argument of `sendfile' will be a
// `size_t' a 32-bit integer while the `st_size' field of the stat structure will be off64_t.
// So `size' will have to be `uint64_t'. In all other cases, it will be `size_t'.
auto size = UnsignedCast(sourceStat.st_size);
// Note that per man page for large files, you have to iterate until the
// whole file is copied (Linux has a limit of 0x7ffff000 bytes copied).
while (size > 0)
{
ssize_t sent = sendfile(outFd, inFd, nullptr, (size >= SSIZE_MAX ? SSIZE_MAX : static_cast<size_t>(size)));
if (sent < 0)
{
if (errno != EINVAL && errno != ENOSYS)
{
return -1;
}
else
{
break;
}
}
else
{
assert(UnsignedCast(sent) <= size);
size -= UnsignedCast(sent);
}
}
if (size == 0)
{
copied = true;
}
// sendfile couldn't be used; fall back to a manual copy below. This could happen
// if we're on an old kernel, for example, where sendfile could only be used
// with sockets and not regular files.
#endif // HAVE_SENDFILE
// Manually read all data from the source and write it to the destination.
if (!copied && CopyFile_ReadWrite(inFd, outFd) != 0)
{
return -1;
}
// Now that the data from the file has been copied, copy over metadata
// from the source file. First copy the file times.
while (CheckInterrupted(ret = fstat_(inFd, &sourceStat)));
if (ret == 0)
{
struct timeval origTimes[2];
origTimes[0].tv_sec = sourceStat.st_atime;
origTimes[0].tv_usec = 0;
origTimes[1].tv_sec = sourceStat.st_mtime;
origTimes[1].tv_usec = 0;
while (CheckInterrupted(ret = futimes(outFd, origTimes)));
}
if (ret != 0)
{
return -1;
}
// Then copy permissions.
while (CheckInterrupted(ret = fchmod(outFd, sourceStat.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO))));
if (ret != 0)
{
return -1;
}
return 0;
#endif // HAVE_FCOPYFILE
}
extern "C" intptr_t SystemNative_INotifyInit()
{
#if HAVE_INOTIFY
return inotify_init();
#else
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_INotifyAddWatch(intptr_t fd, const char* pathName, uint32_t mask)
{
assert(fd >= 0);
assert(pathName != nullptr);
#if HAVE_INOTIFY
return inotify_add_watch(ToFileDescriptor(fd), pathName, mask);
#else
(void)fd, (void)pathName, (void)mask;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_INotifyRemoveWatch(intptr_t fd, int32_t wd)
{
assert(fd >= 0);
assert(wd >= 0);
#if HAVE_INOTIFY
return inotify_rm_watch(ToFileDescriptor(fd), wd);
#else
(void)fd, (void)wd;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" char* SystemNative_RealPath(const char* path)
{
assert(path != nullptr);
return realpath(path, nullptr);
}
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