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1136 lines (982 loc) · 33.3 KB
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/*
* Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// Helper functions that mostly delegate to POSIX functions
// These functions are called from NFIPosixSupport Java class using NFI
// This file uses GNU extensions. Functions that require non-GNU versions (e.g. strerror_r)
// need to go to posix_no_gnu.c
#if defined(__gnu_linux__) && !defined(_GNU_SOURCE)
#define _GNU_SOURCE 1
#endif
#include <arpa/inet.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <semaphore.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <unistd.h>
#include <pwd.h>
#ifdef __APPLE__
#include <util.h>
#else
#include <pty.h>
#endif
#ifndef _WIN32
#include <sys/resource.h>
#endif
int64_t call_getpid() {
return getpid();
}
int32_t call_umask(int32_t mask) {
return umask(mask);
}
int32_t get_inheritable(int32_t fd) {
int flags = fcntl(fd, F_GETFD, 0);
if (flags < 0) {
return -1;
}
return !(flags & FD_CLOEXEC);
}
// note: this is also called between fork() and exec()
int32_t set_inheritable(int32_t fd, int32_t inheritable) {
int res = fcntl(fd, F_GETFD);
if (res >= 0) {
int new_flags;
if (inheritable) {
new_flags = res & ~FD_CLOEXEC;
} else {
new_flags = res | FD_CLOEXEC;
}
if (new_flags != res) {
res = fcntl(fd, F_SETFD, new_flags);
}
}
return res;
}
int32_t call_openat(int32_t dirFd, const char *pathname, int32_t flags, int32_t mode) {
return openat(dirFd, pathname, flags, mode);
}
int32_t call_close(int32_t fd) {
return close(fd);
}
int64_t call_read(int32_t fd, void *buf, uint64_t count) {
return read(fd, buf, count);
}
int64_t call_write(int32_t fd, void *buf, uint64_t count) {
return write(fd, buf, count);
}
int32_t call_dup(int32_t fd) {
return fcntl(fd, F_DUPFD_CLOEXEC, 0);
}
int32_t call_dup2(int32_t oldfd, int32_t newfd, int32_t inheritable) {
#ifdef __gnu_linux__
if (!inheritable) {
return dup3(oldfd, newfd, O_CLOEXEC);
}
#endif
int res = dup2(oldfd, newfd);
if (res < 0) {
return res;
}
if (!inheritable) {
if (set_inheritable(res, 0) < 0) {
close(res);
return -1;
}
}
return res;
}
int32_t call_pipe2(int32_t *pipefd) {
#ifdef __gnu_linux__
return pipe2(pipefd, O_CLOEXEC);
#else
int res = pipe(pipefd);
if (res != 0) {
return res;
}
if (set_inheritable(pipefd[0], 0) < 0 || set_inheritable(pipefd[1], 0) < 0) {
close(pipefd[0]);
close(pipefd[1]);
return -1;
}
return 0;
#endif
}
static void fill_select_result(int32_t* fds, int32_t fdsLen, fd_set* set, int8_t* result, int32_t resultOffset) {
for (int32_t i = 0; i < fdsLen; ++i) {
if (FD_ISSET(fds[i], set)) {
result[resultOffset + i] = 1;
}
}
}
static void fill_fd_set(fd_set *set, int32_t* fds, int32_t len) {
FD_ZERO(set);
for (int32_t i = 0; i < len; ++i) {
FD_SET(fds[i], set);
}
}
// selected is output parameter, a non-zero value will be written to
// indices of file descriptors that were selected. The array indices
// should be interpreted as if read/write/err file descriptors were
// concatendated into one array
int32_t call_select(int32_t nfds, int32_t* readfds, int32_t readfdsLen,
int32_t* writefds, int32_t writefdsLen, int32_t* errfds, int32_t errfdsLen,
int64_t timeoutSec, int64_t timeoutUsec, int8_t* selected) {
fd_set readfdsSet, writefdsSet, errfdsSet;
fill_fd_set(&readfdsSet, readfds, readfdsLen);
fill_fd_set(&writefdsSet, writefds, writefdsLen);
fill_fd_set(&errfdsSet, errfds, errfdsLen);
struct timeval timeout = {timeoutSec, timeoutUsec};
int result = select(nfds, &readfdsSet, &writefdsSet, &errfdsSet, timeoutSec >= 0 ? &timeout : NULL);
// fill in the output parameter
fill_select_result(readfds, readfdsLen, &readfdsSet, selected, 0);
fill_select_result(writefds, writefdsLen, &writefdsSet, selected, readfdsLen);
fill_select_result(errfds, errfdsLen, &errfdsSet, selected, readfdsLen + writefdsLen);
return (int32_t) result;
}
int64_t call_lseek(int32_t fd, int64_t offset, int32_t whence) {
return lseek(fd, offset, whence);
}
int32_t call_ftruncate(int32_t fd, int64_t length) {
return ftruncate(fd, length);
}
int32_t call_truncate(const char* path, int64_t length) {
return truncate(path, length);
}
int32_t call_fsync(int32_t fd) {
return fsync(fd);
}
int32_t call_flock(int32_t fd, int32_t operation) {
return flock(fd, operation);
}
int32_t call_fcntl_lock(int32_t fd, int32_t blocking, int32_t lockType, int32_t whence, int64_t start, int64_t length) {
struct flock l;
l.l_type = lockType;
l.l_whence = whence;
l.l_start = start;
l.l_len = length;
return fcntl(fd, blocking ? F_SETLKW : F_SETLK, &l);
}
int32_t get_blocking(int32_t fd) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
return -1;
}
return !(flags & O_NONBLOCK);
}
int32_t set_blocking(int32_t fd, int32_t blocking) {
int res = fcntl(fd, F_GETFL);
if (res >= 0) {
int flags;
if (blocking) {
flags = res & ~O_NONBLOCK;
} else {
flags = res | O_NONBLOCK;
}
res = fcntl(fd, F_SETFL, flags);
}
return res;
}
int32_t get_terminal_size(int32_t fd, int32_t *size) {
struct winsize w;
int res = ioctl(fd, TIOCGWINSZ, &w);
if (res == 0) {
size[0] = w.ws_col;
size[1] = w.ws_row;
}
return res;
}
static void stat_struct_to_longs(struct stat *st, int64_t *out) {
// TODO some of these use implementation-defined behaviour of unsigned -> signed conversion
out[0] = st->st_mode;
out[1] = st->st_ino;
out[2] = st->st_dev;
out[3] = st->st_nlink;
out[4] = st->st_uid;
out[5] = st->st_gid;
out[6] = st->st_size;
#ifdef __APPLE__
out[7] = st->st_atimespec.tv_sec;
out[8] = st->st_mtimespec.tv_sec;
out[9] = st->st_ctimespec.tv_sec;
out[10] = st->st_atimespec.tv_nsec;
out[11] = st->st_mtimespec.tv_nsec;
out[12] = st->st_ctimespec.tv_nsec;
#else
out[7] = st->st_atim.tv_sec;
out[8] = st->st_mtim.tv_sec;
out[9] = st->st_ctim.tv_sec;
out[10] = st->st_atim.tv_nsec;
out[11] = st->st_mtim.tv_nsec;
out[12] = st->st_ctim.tv_nsec;
#endif
}
int32_t call_fstatat(int32_t dirFd, const char *path, int32_t followSymlinks, int64_t *out) {
struct stat st;
int result = fstatat(dirFd, path, &st, followSymlinks ? 0 : AT_SYMLINK_NOFOLLOW);
if (result == 0) {
stat_struct_to_longs(&st, out);
}
return result;
}
int32_t call_fstat(int32_t fd, int64_t *out) {
struct stat st;
int result = fstat(fd, &st);
if (result == 0) {
stat_struct_to_longs(&st, out);
}
return result;
}
static void statvfs_struct_to_longs(struct statvfs *st, int64_t *out) {
// TODO some of these use implementation-defined behaviour of unsigned -> signed conversion
out[0] = st->f_bsize;
out[1] = st->f_frsize;
out[2] = st->f_blocks;
out[3] = st->f_bfree;
out[4] = st->f_bavail;
out[5] = st->f_files;
out[6] = st->f_ffree;
out[7] = st->f_favail;
out[8] = st->f_flag;
out[9] = st->f_namemax;
out[10] = st->f_fsid;
}
int32_t call_statvfs(const char *path, int64_t *out) {
struct statvfs st;
int result = statvfs(path, &st);
if (result == 0) {
statvfs_struct_to_longs(&st, out);
}
return result;
}
int32_t call_fstatvfs(int32_t fd, int64_t *out) {
struct statvfs st;
int result = fstatvfs(fd, &st);
if (result == 0) {
statvfs_struct_to_longs(&st, out);
}
return result;
}
int32_t call_uname(char *sysname, char *nodename, char *release, char *version, char *machine, int32_t size) {
struct utsname buf;
int result = uname(&buf);
if (result == 0) {
snprintf(sysname, size, "%s", buf.sysname);
snprintf(nodename, size, "%s", buf.nodename);
snprintf(release, size, "%s", buf.release);
snprintf(version, size, "%s", buf.version);
snprintf(machine, size, "%s", buf.machine);
}
return result;
}
int32_t call_unlinkat(int32_t dirFd, const char *pathname, int32_t rmdir) {
return unlinkat(dirFd, pathname, rmdir ? AT_REMOVEDIR : 0);
}
int32_t call_linkat(int32_t oldDirFd, const char *oldPath, int32_t newDirFd, const char *newPath, int32_t flags) {
return linkat(oldDirFd, oldPath, newDirFd, newPath, flags);
}
int32_t call_symlinkat(const char *target, int32_t dirFd, const char *linkpath) {
return symlinkat(target, dirFd, linkpath);
}
int32_t call_mkdirat(int32_t dirFd, const char *pathname, int32_t mode) {
return mkdirat(dirFd, pathname, mode);
}
int32_t call_getcwd(char *buf, uint64_t size) {
return getcwd(buf, size) == NULL ? -1 : 0;
}
int32_t call_chdir(const char *path) {
return chdir(path);
}
int32_t call_fchdir(int32_t fd) {
return fchdir(fd);
}
int32_t call_fchown(int32_t fd, int64_t owner, int64_t group) {
return fchown(fd, owner, group);
}
int32_t call_fchownat(int32_t dirfd, const char *pathname, int64_t owner, int64_t group, int32_t followSymlinks) {
return fchownat(dirfd, pathname, owner, group, followSymlinks ? 0 : AT_SYMLINK_NOFOLLOW);
}
int32_t call_isatty(int32_t fd) {
return isatty(fd);
}
intptr_t call_opendir(const char *name) {
return (intptr_t) opendir(name);
}
intptr_t call_fdopendir(int32_t fd) {
return (intptr_t) fdopendir(fd);
}
int32_t call_closedir(intptr_t dirp) {
return closedir((DIR *) dirp);
}
int32_t call_readdir(intptr_t dirp, char *nameBuf, uint64_t nameBufSize, int64_t *out) {
errno = 0;
struct dirent *dirEntry = readdir((DIR *) dirp);
if (dirEntry != NULL) {
snprintf(nameBuf, nameBufSize, "%s", dirEntry->d_name);
out[0] = dirEntry->d_ino;
out[1] = dirEntry->d_type;
return 1;
}
return 0;
}
void call_rewinddir(intptr_t dirp) {
rewinddir((DIR *) dirp);
}
#ifdef __gnu_linux__
int32_t call_utimensat(int32_t dirFd, const char *path, int64_t *timespec, int32_t followSymlinks) {
if (!timespec) {
return utimensat(dirFd, path, NULL, followSymlinks ? 0 : AT_SYMLINK_NOFOLLOW);
} else {
struct timespec times[2];
times[0].tv_sec = timespec[0];
times[0].tv_nsec = timespec[1];
times[1].tv_sec = timespec[2];
times[1].tv_nsec = timespec[3];
return utimensat(dirFd, path, times, followSymlinks ? 0 : AT_SYMLINK_NOFOLLOW);
}
}
int32_t call_futimens(int32_t fd, int64_t *timespec) {
if (!timespec) {
return futimens(fd, NULL);
} else {
struct timespec times[2];
times[0].tv_sec = timespec[0];
times[0].tv_nsec = timespec[1];
times[1].tv_sec = timespec[2];
times[1].tv_nsec = timespec[3];
return futimens(fd, times);
}
}
#endif
int32_t call_futimes(int32_t fd, int64_t *timeval) {
if (!timeval) {
return futimes(fd, NULL);
} else {
struct timeval times[2];
times[0].tv_sec = timeval[0];
times[0].tv_usec = timeval[1];
times[1].tv_sec = timeval[2];
times[1].tv_usec = timeval[3];
return futimes(fd, times);
}
}
int32_t call_lutimes(const char *filename, int64_t *timeval) {
if (!timeval) {
return lutimes(filename, NULL);
} else {
struct timeval times[2];
times[0].tv_sec = timeval[0];
times[0].tv_usec = timeval[1];
times[1].tv_sec = timeval[2];
times[1].tv_usec = timeval[3];
return lutimes(filename, times);
}
}
int32_t call_utimes(const char *filename, int64_t *timeval) {
if (!timeval) {
return utimes(filename, NULL);
} else {
struct timeval times[2];
times[0].tv_sec = timeval[0];
times[0].tv_usec = timeval[1];
times[1].tv_sec = timeval[2];
times[1].tv_usec = timeval[3];
return utimes(filename, times);
}
}
int32_t call_renameat(int32_t oldDirFd, const char *oldPath, int32_t newDirFd, const char *newPath) {
return renameat(oldDirFd, oldPath, newDirFd, newPath);
}
int32_t call_faccessat(int32_t dirFd, const char *path, int32_t mode, int32_t effectiveIds, int32_t followSymlinks) {
int flags = 0;
if (!followSymlinks) {
flags |= AT_SYMLINK_NOFOLLOW;
}
if (effectiveIds) {
flags |= AT_EACCESS;
}
return faccessat(dirFd, path, mode, flags);
}
int32_t call_fchmodat(int32_t dirFd, const char *path, int32_t mode, int32_t followSymlinks) {
return fchmodat(dirFd, path, mode, followSymlinks ? 0 : AT_SYMLINK_NOFOLLOW);
}
int32_t call_fchmod(int32_t fd, int32_t mode) {
return fchmod(fd, mode);
}
int64_t call_readlinkat(int32_t dirFd, const char *path, char *buf, uint64_t size) {
return readlinkat(dirFd, path, buf, size);
}
int64_t call_waitpid(int64_t pid, int32_t *status, int32_t options) {
return waitpid(pid, status, options);
}
void call_abort() {
abort();
}
int32_t call_wcoredump(int32_t status) {
return WCOREDUMP(status) ? 1 : 0;
}
int32_t call_wifcontinued(int32_t status) {
return WIFCONTINUED(status) ? 1 : 0;
}
int32_t call_wifstopped(int32_t status) {
return WIFSTOPPED(status) ? 1 : 0;
}
int32_t call_wifsignaled(int32_t status) {
return WIFSIGNALED(status) ? 1 : 0;
}
int32_t call_wifexited(int32_t status) {
return WIFEXITED(status) ? 1 : 0;
}
int32_t call_wexitstatus(int32_t status) {
return WEXITSTATUS(status);
}
int32_t call_wtermsig(int32_t status) {
return WTERMSIG(status);
}
int32_t call_wstopsig(int32_t status) {
return WSTOPSIG(status);
}
int32_t call_kill(int64_t pid, int32_t signal) {
return kill(pid, signal);
}
int32_t call_killpg(int64_t pgid, int32_t signal) {
return killpg(pgid, signal);
}
int64_t call_getuid() {
return getuid();
}
int64_t call_geteuid() {
return geteuid();
}
int64_t call_getgid() {
return getgid();
}
int64_t call_getegid() {
return getegid();
}
int64_t call_getppid() {
return getppid();
}
int64_t call_getpgid(int64_t pid) {
return getpgid(pid);
}
int32_t call_setpgid(int64_t pid, int64_t pgid) {
return setpgid(pid, pgid);
}
int64_t call_getpgrp() {
return getpgrp();
}
int64_t call_getsid(int64_t pid) {
return getsid(pid);
}
int64_t call_setsid() {
return setsid();
}
int32_t call_getgroups(int64_t size, int64_t* out) {
if (size > 0) {
// gid_t can be different types, we need to copy the results
gid_t* tmp = calloc(size, sizeof(gid_t));
if (!tmp) {
return -1;
}
int32_t res = getgroups(size, tmp);
for (int64_t i = 0; i < size; i++) {
out[i] = tmp[i];
}
free(tmp);
return res;
} else {
return getgroups(size, NULL);
}
}
int32_t call_getrusage(int32_t who, uint64_t* out) {
#ifndef _WIN32
struct rusage ru;
int result = getrusage(who, &ru);
if (result != 0) {
return result;
}
int offset = 0;
// POSIX prescribes only ru_utime and ru_stime members, macOS and Linux
// have (at least) all those below
# define COPYVAL(v) memcpy(&out[offset++], &v, sizeof(v))
COPYVAL(ru.ru_utime.tv_sec);
COPYVAL(ru.ru_stime.tv_sec);
COPYVAL(ru.ru_maxrss);
COPYVAL(ru.ru_ixrss);
COPYVAL(ru.ru_idrss);
COPYVAL(ru.ru_isrss);
COPYVAL(ru.ru_minflt);
COPYVAL(ru.ru_majflt);
COPYVAL(ru.ru_nswap);
COPYVAL(ru.ru_inblock);
COPYVAL(ru.ru_oublock);
COPYVAL(ru.ru_msgsnd);
COPYVAL(ru.ru_msgrcv);
COPYVAL(ru.ru_nsignals);
COPYVAL(ru.ru_nvcsw);
COPYVAL(ru.ru_nivcsw);
return 0;
# undef COPYVAL
#else
return -1;
#endif
}
int32_t call_openpty(int32_t *outvars) {
return openpty(outvars, outvars + 1, NULL, NULL, NULL);
}
int32_t call_ctermid(char *buf) {
return ctermid(buf) == NULL ? -1 : 0;
}
int32_t call_setenv(char *name, char *value, int overwrite) {
return setenv(name, value, overwrite);
}
int32_t call_unsetenv(char *name) {
return unsetenv(name);
}
// See comment in NFiPosixSupport.execv() for the description of arguments
void call_execv(char *data, int64_t *offsets, int32_t offsetsLen) {
// We reuse the memory allocated for offsets to avoid the need to allocate and reliably free another array
char **strings = (char **) offsets;
for (int32_t i = 0; i < offsetsLen; ++i) {
strings[i] = offsets[i] == -1 ? NULL : data + offsets[i];
}
char *pathname = strings[0];
char **argv = strings + 1;
execv(pathname, argv);
}
int32_t call_system(const char *pathname) {
return system(pathname);
}
int64_t call_mmap(int64_t length, int32_t prot, int32_t flags, int32_t fd, int64_t offset) {
void *result = mmap(NULL, length, prot, flags, fd, offset);
return result == MAP_FAILED ? 0 : (int64_t) result;
}
int32_t call_munmap(int64_t address, int64_t length) {
return munmap((void *) address, length);
}
void call_msync(int64_t address, int64_t offset, int64_t length) {
// TODO: can be generalized to also accept different flags,
// but MS_SYNC and such seem to be defined to different values across systems
msync(((int8_t *) address) + offset, length, MS_SYNC);
}
int32_t call_socket(int32_t family, int32_t type, int32_t protocol) {
return socket(family, type, protocol);
}
// On Java side, socket addresses are stored in a Java byte[] (here represented by a int8_t *).
// Since there are no guarantees about the alignment of this pointer, we cannot simply cast it
// to (struct sockaddr *), instead we do a copy. This shouldn't be a big deal since it is
// just 16/28 bytes (for AF_INET/AF_INET6 respectively).
int32_t call_accept(int32_t sockfd, int8_t *addr, int32_t *addr_len) {
struct sockaddr_storage sa;
socklen_t l = sizeof(sa);
int res = accept(sockfd, (struct sockaddr *) &sa, &l);
if (res >= 0) {
assert(l <= sizeof(sockaddr_storage)); // l is small enough to be representable by int32_t...
*addr_len = (int32_t)l; // ...so this unsigned->signed conversion is well defined
memcpy(addr, &sa, l);
}
return res;
}
int32_t call_bind(int32_t sockfd, int8_t *addr, int32_t addr_len) {
struct sockaddr_storage sa;
memcpy(&sa, addr, addr_len);
return bind(sockfd, (struct sockaddr *) &sa, addr_len);
}
int32_t call_connect(int32_t sockfd, int8_t *addr, int32_t addr_len) {
struct sockaddr_storage sa;
memcpy(&sa, addr, addr_len);
return connect(sockfd, (struct sockaddr *) &sa, addr_len);
}
int32_t call_listen(int32_t sockfd, int32_t backlog) {
return listen(sockfd, backlog);
}
int32_t call_getpeername(int32_t sockfd, int8_t *addr, int32_t *addr_len) {
struct sockaddr_storage sa;
socklen_t l = sizeof(sa);
int res = getpeername(sockfd, (struct sockaddr *) &sa, &l);
if (res != -1) {
assert(l <= sizeof(sockaddr_storage)); // l is small enough to be representable by int32_t...
*addr_len = (int32_t)l; // ...so this unsigned->signed conversion is well defined
memcpy(addr, &sa, l);
}
return res;
}
int32_t call_getsockname(int32_t sockfd, int8_t *addr, int32_t *addr_len) {
struct sockaddr_storage sa;
socklen_t l = sizeof(sa);
int res = getsockname(sockfd, (struct sockaddr *) &sa, &l);
if (res != -1) {
assert(l <= sizeof(sockaddr_storage)); // l is small enough to be representable by int32_t...
*addr_len = (int32_t)l; // ...so this unsigned->signed conversion is well defined
memcpy(addr, &sa, l);
}
return res;
}
//TODO len should be size_t, retval should be ssize_t
int32_t call_send(int32_t sockfd, void *buf, int32_t offset, int32_t len, int32_t flags) {
return send(sockfd, buf + offset, len, flags);
}
int32_t call_sendto(int32_t sockfd, void *buf, int32_t offset, int32_t len, int32_t flags, int8_t *addr, int32_t addr_len) {
struct sockaddr_storage sa;
memcpy(&sa, addr, addr_len);
return sendto(sockfd, buf + offset, len, flags, (struct sockaddr *) &sa, addr_len);
}
int32_t call_recv(int32_t sockfd, void *buf, int32_t offset, int32_t len, int32_t flags) {
return recv(sockfd, buf + offset, len, flags);
}
int32_t call_recvfrom(int32_t sockfd, void *buf, int32_t offset, int32_t len, int32_t flags, int8_t *src_addr, int32_t *addr_len) {
struct sockaddr_storage sa;
socklen_t l = sizeof(sa);
int res = recvfrom(sockfd, buf + offset, len, flags, (struct sockaddr *) &sa, &l);
if (res != -1) {
assert(l <= sizeof(sockaddr_storage)); // l is small enough to be representable by int32_t...
*addr_len = (int32_t)l; // ...so this unsigned->signed conversion is well defined
memcpy(src_addr, &sa, l);
}
return res;
}
int32_t call_shutdown(int32_t sockfd, int32_t how) {
return shutdown(sockfd, how);
}
#define MAX_SOCKOPT_LEN 1024
int32_t call_getsockopt(int32_t sockfd, int32_t level, int32_t optname, void *buf, int32_t *bufLen) {
// We don't know anything about the alignment of the buf pointer, neither we know what alignment
// is expected by getsockopt, since that depends on the actual value of level/optname. Thus we
// need to make a copy to a buffer that is aligned for any data type. We could use malloc for
// this, but most options are just 4 bytes. Or we could use alloca, but I can't find any
// documentation of alignment guarantees, its use is discouraged and there is no way of detecting
// stack overflow, so we'd have to put some arbitrary limit to bufLen anyway - in which case
// a properly aligned, stack-allocated buffer of a fixed size should work fine.
// The limit of 1024 is inspired by the implementation of CPython's sock_getsockopt.
char alignedBuf[MAX_SOCKOPT_LEN] __attribute__ ((aligned));
socklen_t len = *bufLen;
if (len > sizeof(alignedBuf)) {
// If this ever happens, we can increase MAX_SOCKOPT_LEN or use malloc.
errno = ENOMEM;
return -1;
}
int res = getsockopt(sockfd, level, optname, alignedBuf, &len);
if (res == 0) {
*bufLen = len;
memcpy(buf, alignedBuf, len);
}
return res;
}
int32_t call_setsockopt(int32_t sockfd, int32_t level, int32_t optname, void *buf, int32_t bufLen) {
// see comments in call_getsockopt
char alignedBuf[MAX_SOCKOPT_LEN] __attribute__ ((aligned));
if (bufLen > sizeof(alignedBuf)) {
errno = ENOMEM;
return -1;
}
memcpy(alignedBuf, buf, bufLen);
return setsockopt(sockfd, level, optname, alignedBuf, bufLen);
}
int32_t call_inet_addr(const char *src) {
return ntohl(inet_addr(src));
}
int64_t call_inet_aton(const char *src) {
struct in_addr addr;
int r = inet_aton(src, &addr);
if (r != 1) {
return -1;
}
return ntohl(addr.s_addr) & 0xFFFFFFFF;
}
int32_t call_inet_ntoa(int32_t src, char *dst) {
struct in_addr addr;
addr.s_addr = htonl(src);
const char *s = inet_ntoa(addr);
size_t len = strlen(s);
assert(len <= INET_ADDRSTRLEN - 1);
memcpy(dst, s, len);
return len;
}
int32_t call_inet_pton(int32_t family, const char *src, void *dst) {
return inet_pton(family, src, dst);
}
int32_t call_inet_ntop(int32_t family, void *src, char *dst, int32_t dstSize) {
const char *r = inet_ntop(family, src, dst, dstSize);
return r == NULL ? -1 : 0;
}
int32_t call_gethostname(char *buf, int64_t bufLen) {
return gethostname(buf, bufLen);
}
int32_t call_getnameinfo(int8_t *addr, int32_t addr_len, char *hostBuf, int32_t hostBufLen, char *servBuf, int32_t servBufLen, int32_t flags) {
struct sockaddr_storage sa;
memcpy(&sa, addr, addr_len);
return getnameinfo((struct sockaddr *) &sa, addr_len, hostBuf, hostBufLen, servBuf, servBufLen, flags);
}
int32_t call_getaddrinfo(const char *node, const char *service, int32_t family, int32_t sockType, int32_t protocol, int32_t flags, int64_t *ptr) {
struct addrinfo hints;
struct addrinfo *res;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = flags;
hints.ai_family = family;
hints.ai_socktype = sockType;
hints.ai_protocol = protocol;
int ret = getaddrinfo(node, service, &hints, &res);
if (ret == 0) {
*ptr = (int64_t) res;
}
return ret;
}
void call_freeaddrinfo(int64_t ptr) {
freeaddrinfo((struct addrinfo *) ptr);
}
void call_gai_strerror(int32_t error, char *buf, int32_t buflen) {
snprintf(buf, buflen, "%s", gai_strerror(error));
}
int32_t get_addrinfo_members(int64_t ptr, int32_t *intData, int64_t *longData, int8_t *addr) {
// see NFIPosixSupport.AddrInfo for description of the way data is transferred
struct addrinfo *ai = (struct addrinfo *) ptr;
memcpy(addr, ai->ai_addr, ai->ai_addrlen);
longData[0] = (int64_t) ai->ai_canonname;
longData[1] = (int64_t) ai->ai_next;
intData[0] = ai->ai_flags;
intData[1] = ai->ai_family;
intData[2] = ai->ai_socktype;
intData[3] = ai->ai_protocol;
assert(ai->ai_addr_len <= sizeof(sockaddr_storage));
intData[4] = ai->ai_addrlen;
intData[5] = ai->ai_addr->sa_family;
if (ai->ai_canonname != NULL) {
size_t len = strlen(ai->ai_canonname);
if (len >= 0x7fffffff) {
return -1;
}
intData[6] = len;
}
return 0;
}
sem_t* call_sem_open(const char *name, int32_t openFlags, int32_t mode, int32_t value) {
sem_t* result = sem_open(name, openFlags, mode, value);
if (result == (sem_t*)SEM_FAILED) {
return NULL;
}
return result;
}
int32_t call_sem_close(sem_t* handle) {
return sem_close(handle);
}
int32_t call_sem_unlink(const char *name) {
return sem_unlink(name);
}
#ifdef __linux__
int32_t call_sem_getvalue(sem_t* handle, int32_t *value) {
int valueInt;
int res = sem_getvalue(handle, &valueInt);
*value = valueInt;
return res;
}
#endif
int32_t call_sem_post(sem_t* handle) {
return sem_post(handle);
}
int32_t call_sem_wait(sem_t* handle) {
return sem_wait(handle);
}
int32_t call_sem_trywait(sem_t* handle) {
return sem_trywait(handle);
}
#ifdef __linux__
int32_t call_sem_timedwait(sem_t* handle, int64_t deadlineNs) {
const int64_t nsInSec = 1000 * 1000 * 1000;
struct timespec deadline = {deadlineNs / nsInSec, deadlineNs % nsInSec};
return sem_timedwait(handle, &deadline);
}
#endif
int32_t get_sysconf_getpw_r_size_max() {
return sysconf(_SC_GETPW_R_SIZE_MAX);
}
static void pwd_to_out(struct passwd* p, char* buffer, uint64_t *output) {
output[0] = p->pw_name - buffer;
output[1] = p->pw_uid;
output[2] = p->pw_gid;
output[3] = p->pw_dir - buffer;
output[4] = p->pw_shell - buffer;
}
// The caller must provide a buffer that will be filled with '\0' terminated strings.
// The "output" array contains in this order:
// 0) offset of the start of 'name' within the provided buffer ('\0' terminated string)
// 1) uid
// 2) gid
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