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pal_io.c
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pal_io.c
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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.
#include "pal_compiler.h"
#include "pal_config.h"
#include "pal_errno.h"
#include "pal_io.h"
#include "pal_utilities.h"
#include "pal_safecrt.h"
#include "pal_types.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.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 <sys/socket.h>
#if !HAVE_MAKEDEV_FILEH && HAVE_MAKEDEV_SYSMACROSH
#include <sys/sysmacros.h>
#endif
#include <sys/uio.h>
#if HAVE_SYSLOG_H
#include <syslog.h>
#endif
#if HAVE_TERMIOS_H
#include <termios.h>
#endif
#include <unistd.h>
#include <limits.h>
#if HAVE_FCOPYFILE
#include <copyfile.h>
#elif HAVE_SENDFILE_4
#include <sys/sendfile.h>
#endif
#if HAVE_INOTIFY
#include <sys/inotify.h>
#endif
#if HAVE_STATFS_VFS // Linux
#include <sys/vfs.h>
#elif HAVE_STATFS_MOUNT // BSD
#include <sys/mount.h>
#elif HAVE_SYS_STATVFS_H && !HAVE_NON_LEGACY_STATFS // SunOS
#include <sys/types.h>
#include <sys/statvfs.h>
#include <sys/vfs.h>
#endif
#ifdef _AIX
#include <alloca.h>
// Somehow, AIX mangles the definition for this behind a C++ def
// Redeclare it here
extern int getpeereid(int, uid_t *__restrict__, gid_t *__restrict__);
#elif defined(TARGET_SUNOS)
#ifndef _KERNEL
#define _KERNEL
#define UNDEF_KERNEL
#endif
#include <sys/procfs.h>
#ifdef UNDEF_KERNEL
#undef _KERNEL
#endif
#endif
#ifdef __linux__
#include <sys/utsname.h>
// Ensure FICLONE is defined for all Linux builds.
#ifndef FICLONE
#define FICLONE _IOW(0x94, 9, int)
#endif /* __linux__ */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wreserved-id-macro"
// Ensure __NR_copy_file_range is defined for portable builds.
#include <sys/syscall.h> // __NR_copy_file_range
# if !defined(__NR_copy_file_range)
# if defined(__amd64__)
# define __NR_copy_file_range 326
# elif defined(__i386__)
# define __NR_copy_file_range 377
# elif defined(__arm__)
# define __NR_copy_file_range 391
# elif defined(__aarch64__)
# define __NR_copy_file_range 285
# else
# error Unknown architecture
# endif
# endif
#pragma clang diagnostic pop
#endif
#if HAVE_STAT64
#define stat_ stat64
#define fstat_ fstat64
#define lstat_ lstat64
#else /* HAVE_STAT64 */
#define stat_ stat
#define fstat_ fstat
#define lstat_ lstat
#endif /* HAVE_STAT64 */
// These numeric values are specified by POSIX.
// Validate that our definitions match.
c_static_assert(PAL_S_IRWXU == S_IRWXU);
c_static_assert(PAL_S_IRUSR == S_IRUSR);
c_static_assert(PAL_S_IWUSR == S_IWUSR);
c_static_assert(PAL_S_IXUSR == S_IXUSR);
c_static_assert(PAL_S_IRWXG == S_IRWXG);
c_static_assert(PAL_S_IRGRP == S_IRGRP);
c_static_assert(PAL_S_IWGRP == S_IWGRP);
c_static_assert(PAL_S_IXGRP == S_IXGRP);
c_static_assert(PAL_S_IRWXO == S_IRWXO);
c_static_assert(PAL_S_IROTH == S_IROTH);
c_static_assert(PAL_S_IWOTH == S_IWOTH);
c_static_assert(PAL_S_IXOTH == S_IXOTH);
c_static_assert(PAL_S_ISUID == S_ISUID);
c_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.
#if !defined(TARGET_WASI)
c_static_assert(PAL_S_IFMT == S_IFMT);
c_static_assert(PAL_S_IFIFO == S_IFIFO);
#endif /* TARGET_WASI */
c_static_assert(PAL_S_IFBLK == S_IFBLK);
c_static_assert(PAL_S_IFCHR == S_IFCHR);
c_static_assert(PAL_S_IFDIR == S_IFDIR);
c_static_assert(PAL_S_IFREG == S_IFREG);
c_static_assert(PAL_S_IFLNK == S_IFLNK);
c_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.
// (AIX doesn't have dirent d_type, so none of this there)
// WebAssembly (BROWSER) has dirent d_type but is not correct
// by returning UNKNOWN the managed code properly stats the file
// to detect if entry is directory or not.
#if (defined(DT_UNKNOWN) || defined(TARGET_WASM)) && !defined(TARGET_WASI)
c_static_assert((int)PAL_DT_UNKNOWN == (int)DT_UNKNOWN);
c_static_assert((int)PAL_DT_FIFO == (int)DT_FIFO);
c_static_assert((int)PAL_DT_CHR == (int)DT_CHR);
c_static_assert((int)PAL_DT_DIR == (int)DT_DIR);
c_static_assert((int)PAL_DT_BLK == (int)DT_BLK);
c_static_assert((int)PAL_DT_REG == (int)DT_REG);
c_static_assert((int)PAL_DT_LNK == (int)DT_LNK);
c_static_assert((int)PAL_DT_SOCK == (int)DT_SOCK);
c_static_assert((int)PAL_DT_WHT == (int)DT_WHT);
#endif
// Validate that our Lock enum value are correct for the platform
c_static_assert(PAL_LOCK_SH == LOCK_SH);
c_static_assert(PAL_LOCK_EX == LOCK_EX);
c_static_assert(PAL_LOCK_NB == LOCK_NB);
c_static_assert(PAL_LOCK_UN == LOCK_UN);
// Validate our AccessMode enum values are correct for the platform
c_static_assert(PAL_F_OK == F_OK);
c_static_assert(PAL_X_OK == X_OK);
c_static_assert(PAL_W_OK == W_OK);
c_static_assert(PAL_R_OK == R_OK);
// Validate our SeekWhence enum values are correct for the platform
c_static_assert(PAL_SEEK_SET == SEEK_SET);
c_static_assert(PAL_SEEK_CUR == SEEK_CUR);
c_static_assert(PAL_SEEK_END == SEEK_END);
// Validate our NotifyEvents enum values are correct for the platform
#if HAVE_INOTIFY
c_static_assert(PAL_IN_ACCESS == IN_ACCESS);
c_static_assert(PAL_IN_MODIFY == IN_MODIFY);
c_static_assert(PAL_IN_ATTRIB == IN_ATTRIB);
c_static_assert(PAL_IN_MOVED_FROM == IN_MOVED_FROM);
c_static_assert(PAL_IN_MOVED_TO == IN_MOVED_TO);
c_static_assert(PAL_IN_CREATE == IN_CREATE);
c_static_assert(PAL_IN_DELETE == IN_DELETE);
c_static_assert(PAL_IN_Q_OVERFLOW == IN_Q_OVERFLOW);
c_static_assert(PAL_IN_IGNORED == IN_IGNORED);
c_static_assert(PAL_IN_ONLYDIR == IN_ONLYDIR);
c_static_assert(PAL_IN_DONT_FOLLOW == IN_DONT_FOLLOW);
#if HAVE_IN_EXCL_UNLINK
c_static_assert(PAL_IN_EXCL_UNLINK == IN_EXCL_UNLINK);
#endif // HAVE_IN_EXCL_UNLINK
c_static_assert(PAL_IN_ISDIR == IN_ISDIR);
#endif // HAVE_INOTIFY
static void ConvertFileStatus(const struct stat_* src, FileStatus* dst)
{
dst->Dev = (int64_t)src->st_dev;
dst->RDev = (int64_t)src->st_rdev;
dst->Ino = (int64_t)src->st_ino;
dst->Flags = FILESTATUS_FLAGS_NONE;
dst->Mode = (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;
dst->ATimeNsec = ST_ATIME_NSEC(src);
dst->MTimeNsec = ST_MTIME_NSEC(src);
dst->CTimeNsec = ST_CTIME_NSEC(src);
#if HAVE_STAT_BIRTHTIME
dst->BirthTime = src->st_birthtimespec.tv_sec;
dst->BirthTimeNsec = src->st_birthtimespec.tv_nsec;
dst->Flags |= FILESTATUS_FLAGS_HAS_BIRTHTIME;
#else
// Linux path: until we use statx() instead
dst->BirthTime = 0;
dst->BirthTimeNsec = 0;
#endif
#if HAVE_STAT_FLAGS && defined(UF_HIDDEN)
dst->UserFlags = ((src->st_flags & UF_HIDDEN) == UF_HIDDEN) ? PAL_UF_HIDDEN : 0;
#else
dst->UserFlags = 0;
#endif
}
int32_t SystemNative_Stat(const char* path, FileStatus* output)
{
struct stat_ result;
int ret;
while ((ret = stat_(path, &result)) < 0 && errno == EINTR);
if (ret == 0)
{
ConvertFileStatus(&result, output);
}
return ret;
}
int32_t SystemNative_FStat(intptr_t fd, FileStatus* output)
{
struct stat_ result;
int ret;
while ((ret = fstat_(ToFileDescriptor(fd), &result)) < 0 && errno == EINTR);
if (ret == 0)
{
ConvertFileStatus(&result, output);
}
return ret;
}
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_msg(false, "Unknown Open access mode", (int)flags);
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_msg(false, "Unknown Open flag", (int)flags);
return -1;
}
#if HAVE_O_CLOEXEC
if (flags & PAL_O_CLOEXEC)
ret |= O_CLOEXEC;
#endif
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;
}
intptr_t SystemNative_Open(const char* path, int32_t flags, int32_t mode)
{
// these two ifdefs are for platforms where we dont have the open version of CLOEXEC and thus
// must simulate it by doing a fcntl with the SETFFD version after the open instead
#if !HAVE_O_CLOEXEC
int32_t old_flags = flags;
#endif
flags = ConvertOpenFlags(flags);
if (flags == -1)
{
errno = EINVAL;
return -1;
}
int result;
while ((result = open(path, flags, (mode_t)mode)) < 0 && errno == EINTR);
#if !HAVE_O_CLOEXEC
if (old_flags & PAL_O_CLOEXEC)
{
fcntl(result, F_SETFD, FD_CLOEXEC);
}
#endif
return result;
}
int32_t SystemNative_Close(intptr_t fd)
{
return close(ToFileDescriptor(fd));
}
intptr_t SystemNative_Dup(intptr_t oldfd)
{
int result;
#if HAVE_F_DUPFD_CLOEXEC
while ((result = fcntl(ToFileDescriptor(oldfd), F_DUPFD_CLOEXEC, 0)) < 0 && errno == EINTR);
#elif HAVE_F_DUPFD
while ((result = fcntl(ToFileDescriptor(oldfd), F_DUPFD, 0)) < 0 && errno == EINTR);
// do CLOEXEC here too
fcntl(result, F_SETFD, FD_CLOEXEC);
#else
// The main use cases for dup are setting up the classic Unix dance of setting up file descriptors in advance of performing a fork. Since WASI has no fork, these don't apply.
// https://github.com/bytecodealliance/wasmtime/blob/b2fefe77148582a9b8013e34fe5808ada82b6efc/docs/WASI-rationale.md#why-no-dup
result = oldfd;
#endif
return result;
}
int32_t SystemNative_Unlink(const char* path)
{
int32_t result;
while ((result = unlink(path)) < 0 && errno == EINTR);
return result;
}
intptr_t SystemNative_ShmOpen(const char* name, int32_t flags, int32_t mode)
{
#if defined(SHM_NAME_MAX) // macOS
assert(strlen(name) <= SHM_NAME_MAX);
#elif defined(PATH_MAX) // other Unixes
assert(strlen(name) <= PATH_MAX);
#endif
#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, (mode_t)mode);
#else
(void)name, (void)flags, (void)mode;
errno = ENOTSUP;
return -1;
#endif
}
int32_t SystemNative_ShmUnlink(const char* name)
{
#if HAVE_SHM_OPEN_THAT_WORKS_WELL_ENOUGH_WITH_MMAP
int32_t result;
while ((result = shm_unlink(name)) < 0 && errno == EINTR);
return result;
#else
// Not supported on e.g. Android. Also, prevent a compiler error because name is unused
(void)name;
errno = ENOTSUP;
return -1;
#endif
}
static void ConvertDirent(const struct 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;
#if !defined(DT_UNKNOWN) || defined(TARGET_WASM)
// AIX has no d_type, and since we can't get the directory that goes with
// the filename from ReadDir, we can't stat the file. Return unknown and
// hope that managed code can properly stat the file.
// WebAssembly (BROWSER) has dirent d_type but is not correct
// by returning UNKNOWN the managed code properly stats the file
// to detect if entry is directory or not.
outputEntry->InodeType = PAL_DT_UNKNOWN;
#else
outputEntry->InodeType = (int32_t)entry->d_type;
#endif
#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
}
#if HAVE_READDIR_R
// struct dirent typically contains 64-bit numbers (e.g. d_ino), so we align it at 8-byte.
static const size_t dirent_alignment = 8;
#endif
int32_t SystemNative_GetReadDirRBufferSize(void)
{
#if HAVE_READDIR_R
// dirent should be under 2k in size
assert(sizeof(struct dirent) < 2048);
// add some extra space so we can align the buffer to dirent.
return sizeof(struct dirent) + dirent_alignment - 1;
#else
return 0;
#endif
}
// To reduce the number of string copies, the caller of this function is responsible to ensure the memory
// referenced by outputEntry remains valid until it is read.
// If the platform supports readdir_r, the caller provides a buffer into which the data is read.
// If the platform uses readdir, the caller must ensure no calls are made to readdir/closedir since those will invalidate
// the current dirent. We assume the platform supports concurrent readdir calls to different DIRs.
int32_t SystemNative_ReadDirR(DIR* dir, uint8_t* buffer, int32_t bufferSize, DirectoryEntry* outputEntry)
{
assert(dir != NULL);
assert(outputEntry != NULL);
#if HAVE_READDIR_R
assert(buffer != NULL);
// align to dirent
struct dirent* entry = (struct dirent*)((size_t)(buffer + dirent_alignment - 1) & ~(dirent_alignment - 1));
// check there is dirent size available at entry
if ((buffer + bufferSize) < ((uint8_t*)entry + sizeof(struct dirent)))
{
assert(false && "Buffer size too small; use GetReadDirRBufferSize to get required buffer size");
return ERANGE;
}
struct dirent* result = NULL;
#ifdef _AIX
// AIX returns 0 on success, but bizarrely, it returns 9 for both error and
// end-of-directory. result is NULL for both cases. The API returns the
// same thing for EOD/error, so disambiguation between the two is nearly
// impossible without clobbering errno for yourself and seeing if the API
// changed it. See:
// https://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.basetrf2/readdir_r.htm
errno = 0; // create a success condition for the API to clobber
int error = readdir_r(dir, entry, &result);
if (error == 9)
{
memset(outputEntry, 0, sizeof(*outputEntry)); // managed out param must be initialized
return errno == 0 ? -1 : errno;
}
#else
int error;
// EINTR isn't documented, happens in practice on macOS.
while ((error = readdir_r(dir, entry, &result)) && errno == EINTR);
// positive error number returned -> failure
if (error != 0)
{
assert(error > 0);
memset(outputEntry, 0, sizeof(*outputEntry)); // managed out param must be initialized
return error;
}
// 0 returned with null result -> end-of-stream
if (result == NULL)
{
memset(outputEntry, 0, sizeof(*outputEntry)); // managed out param must be initialized
return -1; // shim convention for end-of-stream
}
#endif
// 0 returned with non-null result (guaranteed to be set to entry arg) -> success
assert(result == entry);
#else
(void)buffer; // unused
(void)bufferSize; // unused
errno = 0;
struct dirent* entry = readdir(dir);
// 0 returned with null result -> end-of-stream
if (entry == NULL)
{
memset(outputEntry, 0, sizeof(*outputEntry)); // managed out param must be initialized
// kernel set errno -> failure
if (errno != 0)
{
assert_err(errno == EBADF, "Invalid directory stream descriptor dir", errno);
return errno;
}
return -1;
}
#endif
ConvertDirent(entry, outputEntry);
return 0;
}
DIR* SystemNative_OpenDir(const char* path)
{
DIR *result;
// EINTR isn't documented, happens in practice on macOS.
while ((result = opendir(path)) == NULL && errno == EINTR);
return result;
}
int32_t SystemNative_CloseDir(DIR* dir)
{
int32_t result;
result = closedir(dir);
// EINTR isn't documented, happens in practice on macOS.
if (result < 0 && errno == EINTR)
{
result = 0;
}
return result;
}
int32_t SystemNative_Pipe(int32_t pipeFds[2], int32_t flags)
{
switch (flags)
{
case 0:
break;
case PAL_O_CLOEXEC:
#if HAVE_O_CLOEXEC
flags = O_CLOEXEC;
#endif
break;
default:
assert_msg(false, "Unknown pipe flag", (int)flags);
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 ((result = pipe2(pipeFds, flags)) < 0 && errno == EINTR);
#elif HAVE_PIPE
// Otherwise, use pipe.
while ((result = pipe(pipeFds)) < 0 && errno == EINTR);
// Then, if O_CLOEXEC was specified, use fcntl to configure the file descriptors appropriately.
#if HAVE_O_CLOEXEC
if ((flags & O_CLOEXEC) != 0 && result == 0)
#else
if ((flags & PAL_O_CLOEXEC) != 0 && result == 0)
#endif
{
while ((result = fcntl(pipeFds[0], F_SETFD, FD_CLOEXEC)) < 0 && errno == EINTR);
if (result == 0)
{
while ((result = fcntl(pipeFds[1], F_SETFD, FD_CLOEXEC)) < 0 && errno == EINTR);
}
if (result != 0)
{
int tmpErrno = errno;
close(pipeFds[0]);
close(pipeFds[1]);
errno = tmpErrno;
}
}
#else /* HAVE_PIPE */
result = -1;
#endif /* HAVE_PIPE */
return result;
}
int32_t SystemNative_FcntlSetFD(intptr_t fd, int32_t flags)
{
int result;
while ((result = fcntl(ToFileDescriptor(fd), F_SETFD, ConvertOpenFlags(flags))) < 0 && errno == EINTR);
return result;
}
int32_t SystemNative_FcntlGetFD(intptr_t fd)
{
return fcntl(ToFileDescriptor(fd), F_GETFD);
}
int32_t SystemNative_FcntlCanGetSetPipeSz(void)
{
#if defined(F_GETPIPE_SZ) && defined(F_SETPIPE_SZ)
return true;
#else
return false;
#endif
}
int32_t SystemNative_FcntlGetPipeSz(intptr_t fd)
{
#ifdef F_GETPIPE_SZ
int32_t result;
while ((result = fcntl(ToFileDescriptor(fd), F_GETPIPE_SZ)) < 0 && errno == EINTR);
return result;
#else
(void)fd;
errno = ENOTSUP;
return -1;
#endif
}
int32_t SystemNative_FcntlSetPipeSz(intptr_t fd, int32_t size)
{
#ifdef F_SETPIPE_SZ
int32_t result;
while ((result = fcntl(ToFileDescriptor(fd), F_SETPIPE_SZ, size)) < 0 && errno == EINTR);
return result;
#else
(void)fd, (void)size;
errno = ENOTSUP;
return -1;
#endif
}
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);
}
int32_t SystemNative_FcntlGetIsNonBlocking(intptr_t fd, int32_t* isNonBlocking)
{
if (isNonBlocking == NULL)
{
return Error_EFAULT;
}
int flags = fcntl(ToFileDescriptor(fd), F_GETFL);
if (flags == -1)
{
*isNonBlocking = 0;
return -1;
}
*isNonBlocking = ((flags & O_NONBLOCK) == O_NONBLOCK) ? 1 : 0;
return 0;
}
int32_t SystemNative_MkDir(const char* path, int32_t mode)
{
int32_t result;
while ((result = mkdir(path, (mode_t)mode)) < 0 && errno == EINTR);
return result;
}
int32_t SystemNative_ChMod(const char* path, int32_t mode)
{
#if HAVE_CHMOD
int32_t result;
while ((result = chmod(path, (mode_t)mode)) < 0 && errno == EINTR);
return result;
#else /* HAVE_CHMOD */
(void)path; // unused
(void)mode; // unused
return EINTR;
#endif /* HAVE_CHMOD */
}
int32_t SystemNative_FChMod(intptr_t fd, int32_t mode)
{
#if HAVE_FCHMOD
int32_t result;
while ((result = fchmod(ToFileDescriptor(fd), (mode_t)mode)) < 0 && errno == EINTR);
return result;
#else /* HAVE_FCHMOD */
(void)fd; // unused
(void)mode; // unused
return EINTR;
#endif /* HAVE_FCHMOD */
}
int32_t SystemNative_FSync(intptr_t fd)
{
int fileDescriptor = ToFileDescriptor(fd);
int32_t result;
while ((result =
#if defined(TARGET_OSX) && HAVE_F_FULLFSYNC
fcntl(fileDescriptor, F_FULLFSYNC)
#else
fsync(fileDescriptor)
#endif
< 0) && errno == EINTR);
return result;
}
int32_t SystemNative_FLock(intptr_t fd, int32_t operation)
{
int32_t result;
#if !defined(TARGET_WASI)
while ((result = flock(ToFileDescriptor(fd), operation)) < 0 && errno == EINTR);
#else /* TARGET_WASI */
result = EINTR;
#endif /* TARGET_WASI */
return result;
}
int32_t SystemNative_ChDir(const char* path)
{
int32_t result;
while ((result = chdir(path)) < 0 && errno == EINTR);
return result;
}
int32_t SystemNative_Access(const char* path, int32_t mode)
{
return access(path, mode);
}
int64_t SystemNative_LSeek(intptr_t fd, int64_t offset, int32_t whence)
{
int64_t result;
while ((
result =
#if HAVE_LSEEK64
lseek64(
ToFileDescriptor(fd),
(off_t)offset,
whence)) < 0 && errno == EINTR);
#else
lseek(
ToFileDescriptor(fd),
(off_t)offset,
whence)) < 0 && errno == EINTR);
#endif
return result;
}
int32_t SystemNative_Link(const char* source, const char* linkTarget)
{
int32_t result;
while ((result = link(source, linkTarget)) < 0 && errno == EINTR);
return result;
}
int32_t SystemNative_SymLink(const char* target, const char* linkPath)
{
int32_t result;
while ((result = symlink(target, linkPath)) < 0 && errno == EINTR);
return result;
}
void SystemNative_GetDeviceIdentifiers(uint64_t dev, uint32_t* majorNumber, uint32_t* minorNumber)
{
#if !defined(TARGET_WASI)
dev_t castedDev = (dev_t)dev;
*majorNumber = (uint32_t)major(castedDev);
*minorNumber = (uint32_t)minor(castedDev);
#else /* TARGET_WASI */
dev_t castedDev = (dev_t)dev;
*majorNumber = 0;
*minorNumber = 0;
#endif /* TARGET_WASI */
}
int32_t SystemNative_MkNod(const char* pathName, uint32_t mode, uint32_t major, uint32_t minor)
{
#if !defined(TARGET_WASI)
dev_t dev = (dev_t)makedev(major, minor);
int32_t result;
while ((result = mknod(pathName, (mode_t)mode, dev)) < 0 && errno == EINTR);
return result;
#else /* TARGET_WASI */
return EINTR;
#endif /* TARGET_WASI */
}
int32_t SystemNative_MkFifo(const char* pathName, uint32_t mode)
{
#if !defined(TARGET_WASI)
int32_t result;
while ((result = mkfifo(pathName, (mode_t)mode)) < 0 && errno == EINTR);
return result;
#else /* TARGET_WASI */
return EINTR;
#endif /* TARGET_WASI */
}
char* SystemNative_MkdTemp(char* pathTemplate)
{
#if !defined(TARGET_WASI)
char* result = NULL;
while ((result = mkdtemp(pathTemplate)) == NULL && errno == EINTR);
return result;
#else /* TARGET_WASI */
return NULL;
#endif /* TARGET_WASI */
}
intptr_t SystemNative_MksTemps(char* pathTemplate, int32_t suffixLength)
{
intptr_t result;
#if HAVE_MKSTEMPS
while ((result = mkstemps(pathTemplate, suffixLength)) < 0 && errno == EINTR);
#elif HAVE_MKSTEMP
// mkstemps is not available bionic/Android, but mkstemp is
// mkstemp doesn't allow the suffix that msktemps does allow, so we'll need to
// remove that before passisng pathTemplate to mkstemp
int32_t pathTemplateLength = (int32_t)strlen(pathTemplate);
// pathTemplate must include at least XXXXXX (6 characters) which are not part of
// the suffix
if (suffixLength < 0 || suffixLength > pathTemplateLength - 6)
{
errno = EINVAL;
return -1;
}
// Make mkstemp ignore the suffix by setting the first char of the suffix to \0,
// if there is a suffix
int32_t firstSuffixIndex = 0;
char firstSuffixChar = 0;
if (suffixLength > 0)
{
firstSuffixIndex = pathTemplateLength - suffixLength;
firstSuffixChar = pathTemplate[firstSuffixIndex];
pathTemplate[firstSuffixIndex] = 0;
}
while ((result = mkstemp(pathTemplate)) < 0 && errno == EINTR);
// Reset the first char of the suffix back to its original value, if there is a suffix
if (suffixLength > 0)
{
pathTemplate[firstSuffixIndex] = firstSuffixChar;
}
#elif TARGET_WASI
assert_msg(false, "Not supported on WASI", 0);
result = -1;
#else
#error "Cannot find mkstemps nor mkstemp on this platform"
#endif
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_msg(false, "Unknown protection", (int)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_msg(false, "Unknown MMap flag", (int)flags);
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_msg(false, "Unknown MSync flag", (int)flags);
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;
}
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 NULL;
}
protection = ConvertMMapProtection(protection);
flags = ConvertMMapFlags(flags);
if (flags == -1 || protection == -1)
{
errno = EINVAL;
return NULL;
}
// Use ToFileDescriptorUnchecked to allow -1 to be passed for the file descriptor, since managed code explicitly uses -1
void* ret =
#if HAVE_MMAP64
mmap64(
#else
mmap(
#endif
address,
(size_t)length,
protection,
flags,
ToFileDescriptorUnchecked(fd),
(off_t)offset);
if (ret == MAP_FAILED)