static TACommandVerdict __lxstat64_cmd(TAThread thread,TAInputStream stream)
{
struct stat64 buffer;
int res;
char* path;
// Prepare
path = readString(&stream);
START_TARGET_OPERATION(thread);
errno=0;
#if ( __i386__ || __powerpc__ || (__s390__ && !__s390x__))
res = __lxstat64(3, path, &buffer);
#else
res = __lxstat64(0, path, &buffer);
#endif
END_TARGET_OPERATION(thread);
// Response
writeInt(thread, res);
writeInt(thread, errno);
writeFileStatus64(thread, &buffer);
sendResponse(thread);
return taDefaultVerdict;
}
static int
try_nocreate (char *tmpl, void *flags)
{
struct_stat64 st;
if (__lxstat64 (_STAT_VER, tmpl, &st) == 0)
__set_errno (EEXIST);
return errno == ENOENT ? 0 : -1;
}
char *
__realpath (const char *name, char *resolved)
{
char *rpath, *dest, *extra_buf = NULL;
const char *start, *end, *rpath_limit;
long int path_max;
#ifdef S_ISLNK
int num_links = 0;
#endif
if (name == NULL)
{
/* As per Single Unix Specification V2 we must return an error if
either parameter is a null pointer. We extend this to allow
the RESOLVED parameter to be NULL in case the we are expected to
allocate the room for the return value. */
__set_errno (EINVAL);
return NULL;
}
if (name[0] == '\0')
{
/* As per Single Unix Specification V2 we must return an error if
the name argument points to an empty string. */
__set_errno (ENOENT);
return NULL;
}
#ifdef PATH_MAX
path_max = PATH_MAX;
#else
path_max = pathconf (name, _PC_PATH_MAX);
if (path_max <= 0)
path_max = 1024;
#endif
if (resolved == NULL)
{
rpath = malloc (path_max);
if (rpath == NULL)
return NULL;
}
else
rpath = resolved;
rpath_limit = rpath + path_max;
if (name[0] != '/')
{
if (!__getcwd (rpath, path_max))
{
rpath[0] = '\0';
goto error;
}
dest = strchr (rpath, '\0');
}
else
{
rpath[0] = '/';
dest = rpath + 1;
}
for (start = end = name; *start; start = end)
{
#ifdef _LIBC
struct stat64 st;
#else
struct stat st;
#endif
/* Skip sequence of multiple path-separators. */
while (*start == '/')
++start;
/* Find end of path component. */
for (end = start; *end && *end != '/'; ++end)
/* Nothing. */;
if (end - start == 0)
break;
else if (end - start == 1 && start[0] == '.')
/* nothing */;
else if (end - start == 2 && start[0] == '.' && start[1] == '.')
{
/* Back up to previous component, ignore if at root already. */
if (dest > rpath + 1)
while ((--dest)[-1] != '/');
}
else
{
size_t new_size;
if (dest[-1] != '/')
*dest++ = '/';
if (dest + (end - start) >= rpath_limit)
{
ptrdiff_t dest_offset = dest - rpath;
char *new_rpath;
if (resolved)
{
__set_errno (ENAMETOOLONG);
if (dest > rpath + 1)
dest--;
*dest = '\0';
goto error;
}
new_size = rpath_limit - rpath;
if (end - start + 1 > path_max)
new_size += end - start + 1;
else
new_size += path_max;
new_rpath = (char *) realloc (rpath, new_size);
if (new_rpath == NULL)
goto error;
rpath = new_rpath;
rpath_limit = rpath + new_size;
dest = rpath + dest_offset;
}
#ifdef _LIBC
dest = __mempcpy (dest, start, end - start);
#else
memcpy (dest, start, end - start);
dest += end - start;
#endif
*dest = '\0';
#ifdef _LIBC
if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
#else
if (lstat (rpath, &st) < 0)
#endif
goto error;
#ifdef S_ISLNK
if (S_ISLNK (st.st_mode))
{
char *buf;
size_t len;
int n;
if (++num_links > MAXSYMLINKS)
{
__set_errno (ELOOP);
goto error;
}
buf = allocsa (path_max);
if (!buf)
{
errno = ENOMEM;
goto error;
}
n = __readlink (rpath, buf, path_max);
if (n < 0)
{
int saved_errno = errno;
freesa (buf);
errno = saved_errno;
goto error;
}
buf[n] = '\0';
if (!extra_buf)
{
extra_buf = allocsa (path_max);
if (!extra_buf)
{
freesa (buf);
errno = ENOMEM;
goto error;
}
}
len = strlen (end);
if ((long int) (n + len) >= path_max)
{
freesa (buf);
__set_errno (ENAMETOOLONG);
goto error;
}
/* Careful here, end may be a pointer into extra_buf... */
memmove (&extra_buf[n], end, len + 1);
name = end = memcpy (extra_buf, buf, n);
if (buf[0] == '/')
dest = rpath + 1; /* It's an absolute symlink */
else
/* Back up to previous component, ignore if at root already: */
if (dest > rpath + 1)
while ((--dest)[-1] != '/');
}
#endif
}
}
if (dest > rpath + 1 && dest[-1] == '/')
--dest;
*dest = '\0';
if (extra_buf)
freesa (extra_buf);
return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;
error:
{
int saved_errno = errno;
if (extra_buf)
freesa (extra_buf);
if (resolved)
strcpy (resolved, rpath);
else
free (rpath);
errno = saved_errno;
}
return NULL;
}
char *
__realpath (const char *name, char *resolved)
{
char *rpath, *dest, *extra_buf = NULL;
const char *start, *end, *rpath_limit;
long int path_max;
int num_links = 0;
size_t prefix_len;
if (name == NULL)
{
/* As per Single Unix Specification V2 we must return an error if
either parameter is a null pointer. We extend this to allow
the RESOLVED parameter to be NULL in case the we are expected to
allocate the room for the return value. */
__set_errno (EINVAL);
return NULL;
}
if (name[0] == '\0')
{
/* As per Single Unix Specification V2 we must return an error if
the name argument points to an empty string. */
__set_errno (ENOENT);
return NULL;
}
#ifdef PATH_MAX
path_max = PATH_MAX;
#else
path_max = pathconf (name, _PC_PATH_MAX);
if (path_max <= 0)
path_max = 8192;
#endif
if (resolved == NULL)
{
rpath = malloc (path_max);
if (rpath == NULL)
{
/* It's easier to set errno to ENOMEM than to rely on the
'malloc-posix' gnulib module. */
errno = ENOMEM;
return NULL;
}
}
else
rpath = resolved;
rpath_limit = rpath + path_max;
/* This is always zero for Posix hosts, but can be 2 for MS-Windows
and MS-DOS X:/foo/bar file names. */
prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
if (!IS_ABSOLUTE_FILE_NAME (name))
{
if (!__getcwd (rpath, path_max))
{
rpath[0] = '\0';
goto error;
}
dest = strchr (rpath, '\0');
start = name;
prefix_len = FILE_SYSTEM_PREFIX_LEN (rpath);
}
else
{
dest = rpath;
if (prefix_len)
{
memcpy (rpath, name, prefix_len);
dest += prefix_len;
}
*dest++ = '/';
if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
{
if (ISSLASH (name[1]) && !ISSLASH (name[2]) && !prefix_len)
*dest++ = '/';
*dest = '\0';
}
start = name + prefix_len;
}
for (end = start; *start; start = end)
{
#ifdef _LIBC
struct stat64 st;
#else
struct stat st;
#endif
int n;
/* Skip sequence of multiple path-separators. */
while (ISSLASH (*start))
++start;
/* Find end of path component. */
for (end = start; *end && !ISSLASH (*end); ++end)
/* Nothing. */;
if (end - start == 0)
break;
else if (end - start == 1 && start[0] == '.')
/* nothing */;
else if (end - start == 2 && start[0] == '.' && start[1] == '.')
{
/* Back up to previous component, ignore if at root already. */
if (dest > rpath + prefix_len + 1)
for (--dest; dest > rpath && !ISSLASH (dest[-1]); --dest)
continue;
if (DOUBLE_SLASH_IS_DISTINCT_ROOT
&& dest == rpath + 1 && !prefix_len
&& ISSLASH (*dest) && !ISSLASH (dest[1]))
dest++;
}
else
{
size_t new_size;
if (!ISSLASH (dest[-1]))
*dest++ = '/';
if (dest + (end - start) >= rpath_limit)
{
ptrdiff_t dest_offset = dest - rpath;
char *new_rpath;
if (resolved)
{
__set_errno (ENAMETOOLONG);
if (dest > rpath + prefix_len + 1)
dest--;
*dest = '\0';
goto error;
}
new_size = rpath_limit - rpath;
if (end - start + 1 > path_max)
new_size += end - start + 1;
else
new_size += path_max;
new_rpath = (char *) realloc (rpath, new_size);
if (new_rpath == NULL)
{
/* It's easier to set errno to ENOMEM than to rely on the
'realloc-posix' gnulib module. */
errno = ENOMEM;
goto error;
}
rpath = new_rpath;
rpath_limit = rpath + new_size;
dest = rpath + dest_offset;
}
#ifdef _LIBC
dest = __mempcpy (dest, start, end - start);
#else
memcpy (dest, start, end - start);
dest += end - start;
#endif
*dest = '\0';
#ifdef _LIBC
if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
#else
if (lstat (rpath, &st) < 0)
#endif
goto error;
if (S_ISLNK (st.st_mode))
{
char *buf;
size_t len;
if (++num_links > MAXSYMLINKS)
{
__set_errno (ELOOP);
goto error;
}
buf = malloca (path_max);
if (!buf)
{
errno = ENOMEM;
goto error;
}
n = __readlink (rpath, buf, path_max - 1);
if (n < 0)
{
int saved_errno = errno;
freea (buf);
errno = saved_errno;
goto error;
}
buf[n] = '\0';
if (!extra_buf)
{
extra_buf = malloca (path_max);
if (!extra_buf)
{
freea (buf);
errno = ENOMEM;
goto error;
}
}
len = strlen (end);
if ((long int) (n + len) >= path_max)
{
freea (buf);
__set_errno (ENAMETOOLONG);
goto error;
}
/* Careful here, end may be a pointer into extra_buf... */
memmove (&extra_buf[n], end, len + 1);
name = end = memcpy (extra_buf, buf, n);
if (IS_ABSOLUTE_FILE_NAME (buf))
{
size_t pfxlen = FILE_SYSTEM_PREFIX_LEN (buf);
if (pfxlen)
memcpy (rpath, buf, pfxlen);
dest = rpath + pfxlen;
*dest++ = '/'; /* It's an absolute symlink */
if (DOUBLE_SLASH_IS_DISTINCT_ROOT)
{
if (ISSLASH (buf[1]) && !ISSLASH (buf[2]) && !pfxlen)
*dest++ = '/';
*dest = '\0';
}
/* Install the new prefix to be in effect hereafter. */
prefix_len = pfxlen;
}
else
{
/* Back up to previous component, ignore if at root
already: */
if (dest > rpath + prefix_len + 1)
for (--dest; dest > rpath && !ISSLASH (dest[-1]); --dest)
continue;
if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1
&& ISSLASH (*dest) && !ISSLASH (dest[1]) && !prefix_len)
dest++;
}
}
else if (!S_ISDIR (st.st_mode) && *end != '\0')
{
__set_errno (ENOTDIR);
goto error;
}
}
}
if (dest > rpath + prefix_len + 1 && ISSLASH (dest[-1]))
--dest;
if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rpath + 1 && !prefix_len
&& ISSLASH (*dest) && !ISSLASH (dest[1]))
dest++;
*dest = '\0';
if (extra_buf)
freea (extra_buf);
return rpath;
error:
{
int saved_errno = errno;
if (extra_buf)
freea (extra_buf);
if (resolved == NULL)
free (rpath);
errno = saved_errno;
}
return NULL;
}
/* Generate a temporary file name based on TMPL. TMPL must match the
rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
does not exist at the time of the call to __gen_tempname. TMPL is
overwritten with the result.
KIND may be one of:
__GT_NOCREATE: simply verify that the name does not exist
at the time of the call.
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
and return a read-write fd. The file is mode 0600.
__GT_BIGFILE: same as __GT_FILE but use open64().
__GT_DIR: create a directory, which will be mode 0700.
We use a clever algorithm to get hard-to-predict names. */
int
__gen_tempname (char *tmpl, int kind)
{
int len;
char *XXXXXX;
static uint64_t value;
uint64_t random_time_bits;
unsigned int count;
int fd = -1;
int save_errno = errno;
struct_stat64 st;
/* A lower bound on the number of temporary files to attempt to
generate. The maximum total number of temporary file names that
can exist for a given template is 62**6. It should never be
necessary to try all these combinations. Instead if a reasonable
number of names is tried (we define reasonable as 62**3) fail to
give the system administrator the chance to remove the problems. */
unsigned int attempts_min = 62 * 62 * 62;
/* The number of times to attempt to generate a temporary file. To
conform to POSIX, this must be no smaller than TMP_MAX. */
unsigned int attempts = attempts_min < TMP_MAX ? TMP_MAX : attempts_min;
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
{
__set_errno (EINVAL);
return -1;
}
/* This is where the Xs start. */
XXXXXX = &tmpl[len - 6];
/* Get some more or less random data. */
#ifdef RANDOM_BITS
RANDOM_BITS (random_time_bits);
#else
# if HAVE_GETTIMEOFDAY || _LIBC
{
struct timeval tv;
__gettimeofday (&tv, NULL);
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
}
# else
random_time_bits = time (NULL);
# endif
#endif
value += random_time_bits ^ __getpid ();
for (count = 0; count < attempts; value += 7777, ++count)
{
uint64_t v = value;
/* Fill in the random bits. */
XXXXXX[0] = letters[v % 62];
v /= 62;
XXXXXX[1] = letters[v % 62];
v /= 62;
XXXXXX[2] = letters[v % 62];
v /= 62;
XXXXXX[3] = letters[v % 62];
v /= 62;
XXXXXX[4] = letters[v % 62];
v /= 62;
XXXXXX[5] = letters[v % 62];
switch (kind)
{
case __GT_FILE:
fd = __open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
break;
case __GT_BIGFILE:
fd = __open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
break;
case __GT_DIR:
fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
break;
case __GT_NOCREATE:
/* This case is backward from the other three. __gen_tempname
succeeds if __xstat fails because the name does not exist.
Note the continue to bypass the common logic at the bottom
of the loop. */
if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
{
if (errno == ENOENT)
{
__set_errno (save_errno);
return 0;
}
else
/* Give up now. */
return -1;
}
continue;
default:
assert (! "invalid KIND in __gen_tempname");
}
if (fd >= 0)
{
__set_errno (save_errno);
return fd;
}
else if (errno != EEXIST)
return -1;
}
/* We got out of the loop because we ran out of combinations to try. */
__set_errno (EEXIST);
return -1;
}
/* Generate a temporary file name based on TMPL. TMPL must match the
rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
does not exist at the time of the call to __gen_tempname. TMPL is
overwritten with the result.
KIND may be one of:
__GT_NOCREATE: simply verify that the name does not exist
at the time of the call.
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
and return a read-write fd. The file is mode 0600.
__GT_BIGFILE: same as __GT_FILE but use open64().
__GT_DIR: create a directory, which will be mode 0700.
We use a clever algorithm to get hard-to-predict names. */
int
__gen_tempname (char *tmpl, int kind)
{
int len;
char *XXXXXX;
static uint64_t value;
uint64_t random_time_bits;
int count, fd = -1;
int save_errno = errno;
struct_stat64 st;
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
{
__set_errno (EINVAL);
return -1;
}
/* This is where the Xs start. */
XXXXXX = &tmpl[len - 6];
/* Get some more or less random data. */
#ifdef RANDOM_BITS
RANDOM_BITS (random_time_bits);
#else
# if HAVE_GETTIMEOFDAY || _LIBC
{
struct timeval tv;
__gettimeofday (&tv, NULL);
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
}
# else
random_time_bits = time (NULL);
# endif
#endif
value += random_time_bits ^ __getpid ();
for (count = 0; count < TMP_MAX; value += 7777, ++count)
{
uint64_t v = value;
/* Fill in the random bits. */
XXXXXX[0] = letters[v % 62];
v /= 62;
XXXXXX[1] = letters[v % 62];
v /= 62;
XXXXXX[2] = letters[v % 62];
v /= 62;
XXXXXX[3] = letters[v % 62];
v /= 62;
XXXXXX[4] = letters[v % 62];
v /= 62;
XXXXXX[5] = letters[v % 62];
switch (kind)
{
case __GT_FILE:
fd = __open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
break;
case __GT_BIGFILE:
fd = __open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
break;
case __GT_DIR:
fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
break;
case __GT_NOCREATE:
/* This case is backward from the other three. __gen_tempname
succeeds if __xstat fails because the name does not exist.
Note the continue to bypass the common logic at the bottom
of the loop. */
if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
{
if (errno == ENOENT)
{
__set_errno (save_errno);
return 0;
}
else
/* Give up now. */
return -1;
}
continue;
default:
assert (! "invalid KIND in __gen_tempname");
}
if (fd >= 0)
{
__set_errno (save_errno);
return fd;
}
else if (errno != EEXIST)
return -1;
}
/* We got out of the loop because we ran out of combinations to try. */
__set_errno (EEXIST);
return -1;
}
void
attribute_hidden
__atfct_seterrno_2 (int errval, int fd1, const char *buf1, int fd2,
const char *buf2)
{
if (buf1 != NULL || buf2 != NULL)
{
struct stat64 st;
if (errval == ENOTDIR)
{
/* This can mean either the file descriptor is invalid or
/proc is not mounted. */
if (buf1 != NULL)
{
if (__fxstat64 (_STAT_VER, fd1, &st) != 0)
/* errno is already set correctly. */
return;
/* If /proc is not mounted there is nothing we can do. */
if (S_ISDIR (st.st_mode)
&& (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
|| !S_ISDIR (st.st_mode)))
{
errval = ENOSYS;
goto out;
}
}
if (buf2 != NULL)
{
if (__fxstat64 (_STAT_VER, fd2, &st) != 0)
/* errno is already set correctly. */
return;
/* If /proc is not mounted there is nothing we can do. */
if (S_ISDIR (st.st_mode)
&& (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
|| !S_ISDIR (st.st_mode)))
errval = ENOSYS;
}
}
else if (errval == ENOENT)
{
/* This could mean the file descriptor is not valid. We
reuse BUF for the stat call. Find the slash after the
file descriptor number. */
if (buf1 != NULL)
{
*(char *) strchr (buf1 + sizeof "/proc/self/fd", '/') = '\0';
int e = __lxstat64 (_STAT_VER, buf1, &st);
if ((e == -1 && errno == ENOENT)
||(e == 0 && !S_ISLNK (st.st_mode)))
{
errval = EBADF;
goto out;
}
}
if (buf2 != NULL)
{
*(char *) strchr (buf2 + sizeof "/proc/self/fd", '/') = '\0';
int e = __lxstat64 (_STAT_VER, buf2, &st);
if ((e == -1 && errno == ENOENT)
||(e == 0 && !S_ISLNK (st.st_mode)))
errval = EBADF;
}
}
}
out:
__set_errno (errval);
}
int
lstat64 (const char *file, struct stat64 *buf)
{
return __lxstat64 (_STAT_VER, file, buf);
}
static char *
canonicalize (const char *name, char *resolved)
{
char *rpath, *dest, *extra_buf = NULL;
const char *start, *end, *rpath_limit;
long int path_max;
int num_links = 0, old_errno;
if (name == NULL)
{
/* As per Single Unix Specification V2 we must return an error if
either parameter is a null pointer. We extend this to allow
the RESOLVED parameter to be NULL in case the we are expected to
allocate the room for the return value. */
__set_errno (EINVAL);
return NULL;
}
if (name[0] == '\0')
{
/* As per Single Unix Specification V2 we must return an error if
the name argument points to an empty string. */
__set_errno (ENOENT);
return NULL;
}
#ifdef __WIN32__
{
char *lpFilePart;
int len;
// fprintf(stderr, "name: %s\n", name);
rpath = resolved ? __builtin_alloca (MAX_PATH) : malloc (MAX_PATH);
// unix2winpath (name);
// fprintf(stderr, "name: %s\n", name);
len = GetFullPathName(name, MAX_PATH, rpath, &lpFilePart);
/* GetFullPathName returns bogus paths for *nix-style paths, like
* /foo/bar - it just prepends current drive to them. Keep them
* intact (they need to be for relocation to work!).
*/
if (name[0] == '/') {
strncpy (rpath, name, MAX_PATH - 1);
rpath[MAX_PATH - 1] = '\0';
len = strlen (rpath);
}
// fprintf(stderr, "rpath: %s\n", rpath);
if (len == 0) {
//set_werrno;
return NULL;
}
if (len > MAX_PATH) {
if (resolved)
__set_errno(ENAMETOOLONG);
else {
rpath = realloc(rpath, len + 2);
GetFullPathName(name, len, rpath, &lpFilePart);
// fprintf(stderr, "rpath: %s\n", rpath);
}
}
// if ( ISDIRSEP(name[strlen(name)]) && !ISDIRSEP(rpath[len]) ) {
// rpath[len] = '\\';
// rpath[len + 1] = 0;
// }
old_errno = errno;
//if (!access (rpath, D_OK) && !ISDIRSEP(rpath[len - 1]) ){
if (!access (rpath, R_OK) && !ISDIRSEP(rpath[len - 1]) ){
rpath[len] = '\\';
rpath[len + 1] = 0;
}
errno = old_errno;
win2unixpath (rpath);
// fprintf(stderr, "rpath: %s\n", rpath);
return resolved ? strcpy(resolved, rpath) : rpath ;
}
#else /* __WIN32__ */
#ifdef PATH_MAX
path_max = PATH_MAX;
#else
path_max = pathconf (name, _PC_PATH_MAX);
if (path_max <= 0)
path_max = 1024;
#endif
rpath = resolved ? __builtin_alloca (path_max) : malloc (path_max);
rpath_limit = rpath + path_max;
if (name[0] != '/')
{
if (!__getcwd (rpath, path_max))
{
rpath[0] = '\0';
goto error;
}
dest = strchr (rpath, '\0');
}
else
{
rpath[0] = '/';
dest = rpath + 1;
}
for (start = end = name; *start; start = end)
{
#ifdef _LIBC
struct stat64 st;
#else
struct stat st;
#endif
int n;
/* Skip sequence of multiple path-separators. */
while (*start == '/')
++start;
/* Find end of path component. */
for (end = start; *end && *end != '/'; ++end)
/* Nothing. */;
if (end - start == 0)
break;
else if (end - start == 1 && start[0] == '.')
/* nothing */;
else if (end - start == 2 && start[0] == '.' && start[1] == '.')
{
/* Back up to previous component, ignore if at root already. */
if (dest > rpath + 1)
while ((--dest)[-1] != '/');
}
else
{
size_t new_size;
if (dest[-1] != '/')
*dest++ = '/';
if (dest + (end - start) >= rpath_limit)
{
ptrdiff_t dest_offset = dest - rpath;
if (resolved)
{
__set_errno (ENAMETOOLONG);
if (dest > rpath + 1)
dest--;
*dest = '\0';
goto error;
}
new_size = rpath_limit - rpath;
if (end - start + 1 > path_max)
new_size += end - start + 1;
else
new_size += path_max;
rpath = realloc (rpath, new_size);
rpath_limit = rpath + new_size;
if (rpath == NULL)
return NULL;
dest = rpath + dest_offset;
}
#ifdef _LIBC
dest = __mempcpy (dest, start, end - start);
#else
memcpy (dest, start, end - start);
dest += end - start;
#endif
*dest = '\0';
#ifdef _LIBC
if (__lxstat64 (_STAT_VER, rpath, &st) < 0)
#else
if (lstat (rpath, &st) < 0)
#endif
goto error;
#if HAVE_READLINK
if (S_ISLNK (st.st_mode))
{
char *buf = __builtin_alloca (path_max);
size_t len;
if (++num_links > MAXSYMLINKS)
{
__set_errno (ELOOP);
goto error;
}
n = __readlink (rpath, buf, path_max);
if (n < 0)
goto error;
buf[n] = '\0';
if (!extra_buf)
extra_buf = __builtin_alloca (path_max);
len = strlen (end);
if ((long int) (n + len) >= path_max)
{
__set_errno (ENAMETOOLONG);
goto error;
}
/* Careful here, end may be a pointer into extra_buf... */
memmove (&extra_buf[n], end, len + 1);
name = end = memcpy (extra_buf, buf, n);
if (buf[0] == '/')
dest = rpath + 1; /* It's an absolute symlink */
else
/* Back up to previous component, ignore if at root already: */
if (dest > rpath + 1)
while ((--dest)[-1] != '/');
}
#endif
}
}
if (dest > rpath + 1 && dest[-1] == '/')
--dest;
*dest = '\0';
return resolved ? memcpy (resolved, rpath, dest - rpath + 1) : rpath;
error:
if (resolved)
strcpy (resolved, rpath);
else
free (rpath);
return NULL;
#endif /* __WIN32__ */
}
/* Generate a temporary file name based on TMPL. TMPL must match the
rules for mk[s]temp (i.e. end in at least X_SUFFIX_LEN "X"s,
possibly with a suffix).
The name constructed does not exist at the time of the call to
this function. TMPL is overwritten with the result.
KIND may be one of:
__GT_NOCREATE: simply verify that the name does not exist
at the time of the call.
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
and return a read-write fd. The file is mode 0600.
__GT_DIR: create a directory, which will be mode 0700.
We use a clever algorithm to get hard-to-predict names. */
int
gen_tempname_len (char *tmpl, int suffixlen, int flags, int kind,
size_t x_suffix_len)
{
size_t len;
char *XXXXXX;
unsigned int count;
int fd = -1;
int save_errno = errno;
struct_stat64 st;
struct randint_source *rand_src;
/* A lower bound on the number of temporary files to attempt to
generate. The maximum total number of temporary file names that
can exist for a given template is 62**6. It should never be
necessary to try all these combinations. Instead if a reasonable
number of names is tried (we define reasonable as 62**3) fail to
give the system administrator the chance to remove the problems.
This value requires that X_SUFFIX_LEN be at least 3. */
#define ATTEMPTS_MIN (62 * 62 * 62)
/* The number of times to attempt to generate a temporary file. To
conform to POSIX, this must be no smaller than TMP_MAX. */
#if ATTEMPTS_MIN < TMP_MAX
unsigned int attempts = TMP_MAX;
#else
unsigned int attempts = ATTEMPTS_MIN;
#endif
len = strlen (tmpl);
if (len < x_suffix_len + suffixlen
|| ! check_x_suffix (&tmpl[len - x_suffix_len - suffixlen],
x_suffix_len))
{
__set_errno (EINVAL);
return -1;
}
/* This is where the Xs start. */
XXXXXX = &tmpl[len - x_suffix_len - suffixlen];
/* Get some more or less random data. */
rand_src = randint_all_new (NULL, x_suffix_len);
if (! rand_src)
return -1;
for (count = 0; count < attempts; ++count)
{
size_t i;
for (i = 0; i < x_suffix_len; i++)
XXXXXX[i] = letters[randint_genmax (rand_src, sizeof letters - 2)];
switch (kind)
{
case __GT_FILE:
fd = __open (tmpl,
(flags & ~O_ACCMODE)
| O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
break;
case __GT_DIR:
fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
break;
case __GT_NOCREATE:
/* This case is backward from the other three. This function
succeeds if __xstat fails because the name does not exist.
Note the continue to bypass the common logic at the bottom
of the loop. */
if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
{
if (errno == ENOENT)
{
__set_errno (save_errno);
fd = 0;
goto done;
}
else
{
/* Give up now. */
fd = -1;
goto done;
}
}
continue;
default:
assert (! "invalid KIND in __gen_tempname");
abort ();
}
if (fd >= 0)
{
__set_errno (save_errno);
goto done;
}
else if (errno != EEXIST)
{
fd = -1;
goto done;
}
}
randint_all_free (rand_src);
/* We got out of the loop because we ran out of combinations to try. */
__set_errno (EEXIST);
return -1;
done:
{
int saved_errno = errno;
randint_all_free (rand_src);
__set_errno (saved_errno);
}
return fd;
}
int
__gen_tempname (char *tmpl, int kind)
{
int len;
char *XXXXXX;
static uint64_t value;
uint64_t random_time_bits;
unsigned long count;
int fd = -1;
int save_errno = __libc_errno;
struct stat64 st;
unsigned long attempts_min = 62L * 62L * 62L;
unsigned long attempts = attempts_min < 238328 ? 238328 : attempts_min;
len = strlen (tmpl);
if (len < 6 || strcmp(&tmpl[len - 6], "XXXXXX"))
{
(__libc_errno = (22));
return -1;
}
XXXXXX = &tmpl[len - 6];
for (count = 0; count < attempts; value += 7777, ++count)
{
uint64_t v = value;
XXXXXX[0] = letters[v % 62];
v /= 62;
XXXXXX[1] = letters[v % 62];
v /= 62;
XXXXXX[2] = letters[v % 62];
v /= 62;
XXXXXX[3] = letters[v % 62];
v /= 62;
XXXXXX[4] = letters[v % 62];
v /= 62;
XXXXXX[5] = letters[v % 62];
switch (kind)
{
case 0:
fd = __open (tmpl, 02 | 01000 | 04000, 0400 | 0200);
break;
case 1:
fd = __open64 (tmpl, 02 | 01000 | 04000, 0400 | 0200);
break;
case 2:
fd = __mkdir (tmpl, 0400 | 0200 | 0100);
break;
case 3:
if (__lxstat64 (2, tmpl, &st) < 0)
{
if (__libc_errno == 2)
{
(__libc_errno = (save_errno));
return 0;
}
else
return -1;
}
continue;
}
if (fd >= 0)
{
(__libc_errno = (save_errno));
return fd;
}
else if (__libc_errno != 17)
return -1;
}
(__libc_errno = (17));
return -1;
}
__attribute__((weak)) int lstat64(const char *path, struct stat64 *buf) { return __lxstat64(1, path, buf); }
int __xstat64(int ver, const char *path, struct stat64 *buf)
{
return __lxstat64(ver, path, buf);
}
