summaryrefslogtreecommitdiff
path: root/libc/misc/internals
diff options
context:
space:
mode:
authorEric Andersen <andersen@codepoet.org>2002-03-31 04:17:44 +0000
committerEric Andersen <andersen@codepoet.org>2002-03-31 04:17:44 +0000
commitcdb29e3ea6c22f0c0358f0414e3ddb615b1c394f (patch)
tree2c867e60effb9df51b1a0fa615bb55b398561341 /libc/misc/internals
parent9116dff92e5b362011431f073fe6aa98327be254 (diff)
Rework __gen_tempname() to better match glibc, and add mkstemp64(),
which is needed for busybox ash when using largefile support. -Erik
Diffstat (limited to 'libc/misc/internals')
-rw-r--r--libc/misc/internals/tempname.c106
1 files changed, 64 insertions, 42 deletions
diff --git a/libc/misc/internals/tempname.c b/libc/misc/internals/tempname.c
index 41325d998..427c16cb5 100644
--- a/libc/misc/internals/tempname.c
+++ b/libc/misc/internals/tempname.c
@@ -27,12 +27,14 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include <sys/time.h>
+
/* Return nonzero if DIR is an existent directory. */
static int direxists (const char *dir)
{
@@ -46,8 +48,8 @@ static int direxists (const char *dir)
for use with mk[s]temp. Will fail (-1) if DIR is non-null and
doesn't exist, none of the searched dirs exists, or there's not
enough space in TMPL. */
-int __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
- int try_tmpdir)
+int __path_search (char *tmpl, size_t tmpl_len, const char *dir,
+ const char *pfx, int try_tmpdir)
{
//const char *d;
size_t dlen, plen;
@@ -111,22 +113,28 @@ static const char letters[] =
/* 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. If OPENIT is nonzero, creates the
- file and returns a read-write fd; the file is mode 0600 modulo
- umask. If LARGEFILE is nonzero, uses open64() instead of open().
+ 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 openit)
+int __gen_tempname (char *tmpl, int kind)
{
int len;
char *XXXXXX;
static uint64_t value;
struct timeval tv;
- uint32_t high, low, rh;
- unsigned int k;
+ uint32_t high, low, rh;
+ unsigned int k;
int count, fd;
int save_errno = errno;
- int i;
+ int i;
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
@@ -148,46 +156,60 @@ int __gen_tempname (char *tmpl, int openit)
high = value >> 32;
for (i = 0 ; i < 6 ; i++) {
- rh = high % 62;
- high /= 62;
+ rh = high % 62;
+ high /= 62;
#define L ((UINT32_MAX % 62 + 1) % 62)
- k = (low % 62) + (L * rh);
+ k = (low % 62) + (L * rh);
#undef L
#define H ((UINT32_MAX / 62) + ((UINT32_MAX % 62 + 1) / 62))
- low = (low / 62) + (H * rh) + (k / 62);
+ low = (low / 62) + (H * rh) + (k / 62);
#undef H
- k %= 62;
- XXXXXX[i] = letters[k];
+ k %= 62;
+ XXXXXX[i] = letters[k];
}
- if (openit)
- {
- fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, 0600);
- if (fd >= 0)
- {
- __set_errno (save_errno);
- return fd;
- }
- else if (errno != EEXIST)
- /* Any other error will apply also to other names we might
- try, and there are 2^32 or so of them, so give up now. */
- return -1;
- }
- else
- {
- struct stat st;
- if (stat (tmpl, &st) < 0)
- {
- if (errno == ENOENT)
+ switch(kind) {
+ case __GT_NOCREATE:
{
- __set_errno (save_errno);
- return 0;
+ struct stat st;
+ if (stat (tmpl, &st) < 0)
+ {
+ if (errno == ENOENT)
+ {
+ __set_errno (save_errno);
+ return 0;
+ }
+ else
+ /* Give up now. */
+ return -1;
+ }
+ else
+ continue;
}
- else
- /* Give up now. */
- return -1;
- }
+ case __GT_FILE:
+ fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ break;
+#if defined __UCLIBC_HAVE_LFS__
+ case __GT_BIGFILE:
+ fd = open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+ break;
+#endif
+ case __GT_DIR:
+ fd = mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
+ break;
+ default:
+ fd = -1;
+ assert (! "invalid KIND in __gen_tempname");
}
+
+ if (fd >= 0) {
+ __set_errno (save_errno);
+ return fd;
+ }
+ else if (errno != EEXIST)
+ /* Any other error will apply also to other names we might
+ try, and there are 2^32 or so of them, so give up now. */
+ return -1;
}
/* We got out of the loop because we ran out of combinations to try. */