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/* tempname.c - generate the name of a temporary file.
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Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2005, 2006, 2007 Free Software Foundation,
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Copyright (C) 1991-2003, 2005-2007, 2009-2010 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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# define struct_stat64 struct stat64
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# define small_open __open
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# define large_open __open64
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# define struct_stat64 struct stat
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# define small_open open
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# define large_open open
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# define __gen_tempname gen_tempname
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# define __getpid getpid
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# define __gettimeofday gettimeofday
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# define __mkdir mkdir
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# define __open64 open
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# define __lxstat64(version, file, buf) lstat (file, buf)
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# define __xstat64(version, file, buf) stat (file, buf)
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# include <hp-timing.h>
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# if HP_TIMING_AVAIL
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# define RANDOM_BITS(Var) \
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if (__builtin_expect (value == UINT64_C (0), 0)) \
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/* If this is the first time this function is used initialize \
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the variable we accumulate the value in to some somewhat \
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random value. If we'd not do this programs at startup time \
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might have a reduced set of possible names, at least on slow \
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__gettimeofday (&tv, NULL); \
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value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
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if (__builtin_expect (value == UINT64_C (0), 0)) \
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/* If this is the first time this function is used initialize \
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the variable we accumulate the value in to some somewhat \
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random value. If we'd not do this programs at startup time \
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might have a reduced set of possible names, at least on slow \
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__gettimeofday (&tv, NULL); \
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value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
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HP_TIMING_NOW (Var)
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plen = strlen (pfx);
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d = __secure_getenv ("TMPDIR");
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if (d != NULL && direxists (d))
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else if (dir != NULL && direxists (dir))
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if (direxists (P_tmpdir))
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else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
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__set_errno (ENOENT);
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__set_errno (ENOENT);
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dlen = strlen (dir);
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while (dlen > 1 && dir[dlen - 1] == '/')
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dlen--; /* remove trailing slashes */
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dlen--; /* remove trailing slashes */
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/* check we have room for "${dir}/${pfx}XXXXXX\0" */
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if (tmpl_len < dlen + 1 + plen + 6 + 1)
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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/* Generate a temporary file name based on TMPL. TMPL must match the
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rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
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does not exist at the time of the call to __gen_tempname. TMPL is
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overwritten with the result.
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rules for mk[s]temp (i.e. end in "XXXXXX", possibly with a suffix).
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The name constructed does not exist at the time of the call to
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__gen_tempname. TMPL is overwritten with the result.
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KIND may be one of:
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__GT_NOCREATE: simply verify that the name does not exist
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at the time of the call.
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__GT_FILE: create the file using open(O_CREAT|O_EXCL)
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and return a read-write fd. The file is mode 0600.
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__GT_BIGFILE: same as __GT_FILE but use open64().
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__GT_DIR: create a directory, which will be mode 0700.
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__GT_NOCREATE: simply verify that the name does not exist
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at the time of the call.
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__GT_FILE: create the file using open(O_CREAT|O_EXCL)
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and return a read-write fd. The file is mode 0600.
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__GT_DIR: create a directory, which will be mode 0700.
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We use a clever algorithm to get hard-to-predict names. */
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__gen_tempname (char *tmpl, int kind)
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__gen_tempname (char *tmpl, int suffixlen, int flags, int kind)
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len = strlen (tmpl);
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if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
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if (len < 6 + suffixlen || memcmp (&tmpl[len - 6 - suffixlen], "XXXXXX", 6))
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__set_errno (EINVAL);
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/* This is where the Xs start. */
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XXXXXX = &tmpl[len - 6];
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XXXXXX = &tmpl[len - 6 - suffixlen];
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/* Get some more or less random data. */
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#ifdef RANDOM_BITS
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XXXXXX[5] = letters[v % 62];
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fd = small_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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fd = large_open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
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/* This case is backward from the other three. __gen_tempname
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succeeds if __xstat fails because the name does not exist.
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Note the continue to bypass the common logic at the bottom
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if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
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__set_errno (save_errno);
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assert (! "invalid KIND in __gen_tempname");
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| O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
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fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
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/* This case is backward from the other three. __gen_tempname
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succeeds if __xstat fails because the name does not exist.
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Note the continue to bypass the common logic at the bottom
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if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
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__set_errno (save_errno);
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assert (! "invalid KIND in __gen_tempname");
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__set_errno (save_errno);
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__set_errno (save_errno);
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else if (errno != EEXIST)
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/* We got out of the loop because we ran out of combinations to try. */
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removed
gettext-tools/gnulib-lib/tempname.c
