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/*
* wrappers around low-level operations to provide a simpler interface
* to the operations that Lisp (and some contributed modules) needs.
*
* The functions in this file are typically called directly from Lisp.
* Thus, when their signature changes, they don't need updates in a .h
* file somewhere, but they do need updates in the Lisp code. FIXME:
* It would be nice to enforce this at compile time. It mighn't even
* be all that hard: make the cross-compiler versions of DEFINE-ALIEN-FOO
* macros accumulate strings in a list which then gets written out at
* the end of sbcl2.h at the end of cross-compilation, then rerun
* 'make' in src/runtime/ using the new sbcl2.h as sbcl.h (and make
* sure that all the files in src/runtime/ include sbcl.h). */
/*
* This software is part of the SBCL system. See the README file for
* more information.
*
* This software is derived from the CMU CL system, which was
* written at Carnegie Mellon University and released into the
* public domain. The software is in the public domain and is
* provided with absolutely no warranty. See the COPYING and CREDITS
* files for more information.
*/
#include "sbcl.h"
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <fcntl.h>
#ifndef LISP_FEATURE_WIN32
#include <pwd.h>
#include <time.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <netdb.h>
#endif
#include <stdio.h>
#if defined(LISP_FEATURE_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <errno.h>
#endif
#include "runtime.h"
#include "util.h"
#include "wrap.h"
/* Although it might seem as though this should be in some standard
Unix header, according to Perry E. Metzger, in a message on
sbcl-devel dated 2004-03-29, this is the POSIXly-correct way of
using environ: by an explicit declaration. -- CSR, 2004-03-30 */
extern char **environ;
/*
* stuff needed by CL:DIRECTORY and other Lisp directory operations
*/
/*
* readlink(2) stuff
*/
#ifndef LISP_FEATURE_WIN32
/* a wrapped version of readlink(2):
* -- If path isn't a symlink, or is a broken symlink, return 0.
* -- If path is a symlink, return a newly allocated string holding
* the thing it's linked to. */
char *
wrapped_readlink(char *path)
{
int bufsiz = strlen(path) + 16;
while (1) {
char *result = malloc(bufsiz);
int n_read = readlink(path, result, bufsiz);
if (n_read < 0) {
free(result);
return 0;
} else if (n_read < bufsiz) {
result[n_read] = 0;
return result;
} else {
free(result);
bufsiz *= 2;
}
}
}
#endif
/*
* realpath(3), including a wrapper for Windows.
*/
char * sb_realpath (char *path)
{
#ifndef LISP_FEATURE_WIN32
char *ret;
int errnum;
if ((ret = calloc(PATH_MAX, sizeof(char))) == NULL)
return NULL;
if (realpath(path, ret) == NULL) {
errnum = errno;
free(ret);
errno = errnum;
return NULL;
}
return(ret);
#else
char *ret;
char *cp;
int errnum;
if ((ret = calloc(MAX_PATH, sizeof(char))) == NULL)
return NULL;
if (GetFullPathName(path, MAX_PATH, ret, &cp) == 0) {
errnum = errno;
free(ret);
errno = errnum;
return NULL;
}
return(ret);
#endif
}
/* readdir, closedir, and dirent name accessor. The first three are not strictly
* necessary, but should save us some #!+netbsd in the build, and this also allows
* building Windows versions using the non-ANSI variants of FindFirstFile &co
* under the same API. (Use a structure that appends the handle to the WIN32_FIND_DATA
* as the return value from sb_opendir, on sb_readdir grab the name from the previous
* call and save the new one.) Nikodemus thought he would have to do that to support
* DIRECTORY on UNC paths, but turns out opendir &co do TRT on Windows already -- so
* leaving that bit of tedium for a later date, once we figure out the whole *A vs. *W
* issue out properly. ...FIXME, obviously, as per above.
*
* Once that is done, the lisp side functions are best named OS-OPENDIR, etc.
*/
extern DIR *
sb_opendir(char * name)
{
return opendir(name);
}
extern struct dirent *
sb_readdir(DIR * dirp)
{
return readdir(dirp);
}
extern int
sb_closedir(DIR * dirp)
{
return closedir(dirp);
}
extern char *
sb_dirent_name(struct dirent * ent)
{
return ent->d_name;
}
/*
* stat(2) stuff
*/
static void
copy_to_stat_wrapper(struct stat_wrapper *to, struct stat *from)
{
#define FROB(stem) to->wrapped_st_##stem = from->st_##stem
#ifndef LISP_FEATURE_WIN32
#define FROB2(stem) to->wrapped_st_##stem = from->st_##stem
#else
#define FROB2(stem) to->wrapped_st_##stem = 0;
#endif
FROB(dev);
FROB2(ino);
FROB(mode);
FROB(nlink);
FROB2(uid);
FROB2(gid);
FROB(rdev);
FROB(size);
FROB2(blksize);
FROB2(blocks);
FROB(atime);
FROB(mtime);
FROB(ctime);
#undef FROB
}
int
stat_wrapper(const char *file_name, struct stat_wrapper *buf)
{
struct stat real_buf;
int ret;
#ifdef LISP_FEATURE_WIN32
/*
* Windows won't match the last component of a pathname if there
* is a trailing #\/ or #\\, except if it's <drive>:\ or <drive>:/
* in which case it behaves the other way around. So we remove the
* trailing directory separator unless we are being passed just a
* drive name (e.g. "c:\\"). Some, but not all, of this
* strangeness is documented at Microsoft's support site (as of
* 2006-01-08, at
* <http://support.microsoft.com/default.aspx?scid=kb;en-us;168439>)
*/
char file_buf[MAX_PATH];
strcpy(file_buf, file_name);
int len = strlen(file_name);
if (len != 0 && (file_name[len-1] == '/' || file_name[len-1] == '\\') &&
!(len == 3 && file_name[1] == ':' && isalpha(file_name[0])))
file_buf[len-1] = '\0';
file_name = file_buf;
#endif
if ((ret = stat(file_name,&real_buf)) >= 0)
copy_to_stat_wrapper(buf, &real_buf);
return ret;
}
#ifndef LISP_FEATURE_WIN32
int
lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
{
struct stat real_buf;
int ret;
if ((ret = lstat(file_name,&real_buf)) >= 0)
copy_to_stat_wrapper(buf, &real_buf);
return ret;
}
#else
/* cleaner to do it here than in Lisp */
int lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
{
return stat_wrapper(file_name, buf);
}
#endif
int
fstat_wrapper(int filedes, struct stat_wrapper *buf)
{
struct stat real_buf;
int ret;
if ((ret = fstat(filedes,&real_buf)) >= 0)
copy_to_stat_wrapper(buf, &real_buf);
return ret;
}
/* A wrapper for mkstemp(3), for two reasons: (1) mkstemp does not
exist on Windows; (2) by passing down a mode_t, we don't need a
binding to chmod in SB-UNIX, and need not concern ourselves with
umask issues if we want to use mkstemp to make new files in
OPEN. */
int sb_mkstemp (char *template, mode_t mode) {
#ifdef LISP_FEATURE_WIN32
#define PATHNAME_BUFFER_SIZE MAX_PATH
#define MKTEMP _mktemp
#else
#define PATHNAME_BUFFER_SIZE PATH_MAX
#define MKTEMP mktemp
#endif
int fd;
char buf[PATHNAME_BUFFER_SIZE];
while (1) {
/* Fruit fallen from the tree: for people who like
microoptimizations, we might not need to copy the whole
template on every loop, but only the last several characters.
But I didn't feel like testing the boundary cases in Windows's
_mktemp. */
strncpy(buf, template, PATHNAME_BUFFER_SIZE);
buf[PATHNAME_BUFFER_SIZE-1]=0; /* force NULL-termination */
if (MKTEMP(buf)) {
if ((fd=open(buf, O_CREAT|O_EXCL|O_RDWR, mode))!=-1) {
strcpy(template, buf);
return (fd);
} else
if (errno != EEXIST)
return (-1);
} else
return (-1);
}
#undef MKTEMP
#undef PATHNAME_BUFFER_SIZE
}
/*
* getpwuid() stuff
*/
#ifndef LISP_FEATURE_WIN32
/* Return a newly-allocated string holding the username for "uid", or
* NULL if there's no such user.
*
* KLUDGE: We also return NULL if malloc() runs out of memory
* (returning strdup() result) since it's not clear how to handle that
* error better. -- WHN 2001-12-28 */
char *
uid_username(int uid)
{
struct passwd *p = getpwuid(uid);
if (p) {
/* The object *p is a static struct which'll be overwritten by
* the next call to getpwuid(), so it'd be unsafe to return
* p->pw_name without copying. */
return strdup(p->pw_name);
} else {
return 0;
}
}
char *
passwd_homedir(struct passwd *p)
{
if (p) {
/* Let's be careful about this, shall we? */
size_t len = strlen(p->pw_dir);
if (p->pw_dir[len-1] == '/') {
return strdup(p->pw_dir);
} else {
char *result = malloc(len + 2);
if (result) {
unsigned int nchars = sprintf(result,"%s/",p->pw_dir);
if (nchars == len + 1) {
return result;
} else {
return 0;
}
} else {
return 0;
}
}
} else {
return 0;
}
}
char *
user_homedir(char *name)
{
return passwd_homedir(getpwnam(name));
}
char *
uid_homedir(uid_t uid)
{
return passwd_homedir(getpwuid(uid));
}
#endif /* !LISP_FEATURE_WIN32 */
/*
* functions to get miscellaneous C-level variables
*
* (Doing this by calling functions lets us borrow the smarts of the C
* linker, so that things don't blow up when libc versions and thus
* variable locations change between compile time and run time.)
*/
char **
wrapped_environ()
{
return environ;
}
#ifdef LISP_FEATURE_WIN32
#include <windows.h>
#include <time.h>
/*
* faked-up implementation of select(). Right now just enough to get through
* second genesis.
*/
int sb_select(int top_fd, DWORD *read_set, DWORD *write_set, DWORD *except_set, time_t *timeout)
{
/*
* FIXME: Going forward, we may want to use MsgWaitForMultipleObjects
* in order to support a windows message loop inside serve-event.
*/
HANDLE handles[MAXIMUM_WAIT_OBJECTS];
int fds[MAXIMUM_WAIT_OBJECTS];
int num_handles;
int i;
DWORD retval;
int polling_write;
DWORD win_timeout;
num_handles = 0;
polling_write = 0;
for (i = 0; i < top_fd; i++) {
if (except_set) except_set[i >> 5] = 0;
if (write_set && (write_set[i >> 5] & (1 << (i & 31)))) polling_write = 1;
if (read_set[i >> 5] & (1 << (i & 31))) {
read_set[i >> 5] &= ~(1 << (i & 31));
fds[num_handles] = i;
handles[num_handles++] = (HANDLE) _get_osfhandle(i);
}
}
win_timeout = INFINITE;
if (timeout) win_timeout = (timeout[0] * 1000) + timeout[1];
/* Last parameter here is timeout in milliseconds. */
/* retval = WaitForMultipleObjects(num_handles, handles, 0, INFINITE); */
retval = WaitForMultipleObjects(num_handles, handles, 0, win_timeout);
if (retval < WAIT_ABANDONED) {
/* retval, at this point, is the index of the single live HANDLE/fd. */
read_set[fds[retval] >> 5] |= (1 << (fds[retval] & 31));
return 1;
}
return polling_write;
}
/*
* Windows doesn't have gettimeofday(), and we need it for the compiler,
* for serve-event, and for a couple other things. We don't need a timezone
* yet, however, and the closest we can easily get to a timeval is the
* seconds part. So that's what we do.
*/
#define UNIX_EPOCH_FILETIME 116444736000000000ULL
int sb_gettimeofday(long *timeval, long *timezone)
{
FILETIME ft;
ULARGE_INTEGER uft;
GetSystemTimeAsFileTime(&ft);
uft.LowPart = ft.dwLowDateTime;
uft.HighPart = ft.dwHighDateTime;
uft.QuadPart -= UNIX_EPOCH_FILETIME;
timeval[0] = uft.QuadPart / 10000000;
timeval[1] = (uft.QuadPart % 10000000)/10;
return 0;
}
#endif
/* We will need to define these things or their equivalents for Win32
eventually, but for now let's get it working for everyone else. */
#ifndef LISP_FEATURE_WIN32
/* From SB-BSD-SOCKETS, to get h_errno */
int get_h_errno()
{
return h_errno;
}
/* From SB-POSIX, wait-macros */
int wifexited(int status) {
return WIFEXITED(status);
}
int wexitstatus(int status) {
return WEXITSTATUS(status);
}
int wifsignaled(int status) {
return WIFSIGNALED(status);
}
int wtermsig(int status) {
return WTERMSIG(status);
}
int wifstopped(int status) {
return WIFSTOPPED(status);
}
int wstopsig(int status) {
return WSTOPSIG(status);
}
/* FIXME: POSIX also defines WIFCONTINUED, but that appears not to
exist on at least Linux... */
#endif /* !LISP_FEATURE_WIN32 */
/* From SB-POSIX, stat-macros */
int s_isreg(mode_t mode)
{
return S_ISREG(mode);
}
int s_isdir(mode_t mode)
{
return S_ISDIR(mode);
}
int s_ischr(mode_t mode)
{
return S_ISCHR(mode);
}
int s_isblk(mode_t mode)
{
return S_ISBLK(mode);
}
int s_isfifo(mode_t mode)
{
return S_ISFIFO(mode);
}
#ifndef LISP_FEATURE_WIN32
int s_islnk(mode_t mode)
{
#ifdef S_ISLNK
return S_ISLNK(mode);
#else
return ((mode & S_IFMT) == S_IFLNK);
#endif
}
int s_issock(mode_t mode)
{
#ifdef S_ISSOCK
return S_ISSOCK(mode);
#else
return ((mode & S_IFMT) == S_IFSOCK);
#endif
}
#endif /* !LISP_FEATURE_WIN32 */
#ifndef LISP_FEATURE_WIN32
int sb_getrusage(int who, struct rusage *rusage)
{
return getrusage(who, rusage);
}
int sb_gettimeofday(struct timeval *tp, void *tzp)
{
return gettimeofday(tp, tzp);
}
int sb_nanosleep(struct timespec *rqtp, struct timespec *rmtp)
{
return nanosleep(rqtp, rmtp);
}
int sb_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
return select(nfds, readfds, writefds, exceptfds, timeout);
}
int sb_getitimer(int which, struct itimerval *value)
{
return getitimer(which, value);
}
int sb_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
return setitimer(which, value, ovalue);
}
int sb_utimes(char *path, struct timeval times[2])
{
return utimes(path, times);
}
#endif /* !LISP_FEATURE_WIN32 */