mirror of
https://github.com/coreutils/coreutils.git
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136 lines
3.4 KiB
Plaintext
136 lines
3.4 KiB
Plaintext
#serial 1
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# Check whether getcwd has the bug that it succeeds for a working directory
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# longer than PATH_MAX, yet returns a truncated directory name.
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# If so, arrange to compile the wrapper function.
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# This is necessary for at least GNU libc on linux-2.4.19 and 2.4.20.
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# I've heard that this is due to a Linux kernel bug, and that it has
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# been fixed between 2.4.21-pre3 and 2.4.21-pre4. */
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# From Jim Meyering
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AC_DEFUN([GL_FUNC_GETCWD_PATH_MAX],
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[
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AC_CACHE_CHECK([whether getcwd properly handles paths longer than PATH_MAX],
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gl_cv_func_getcwd_vs_path_max,
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[
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# Arrange for deletion of the temporary directory this test creates.
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ac_clean_files="$ac_clean_files confdir3"
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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/* Don't get link errors because mkdir is redefined to rpl_mkdir. */
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#undef mkdir
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#ifndef CHAR_BIT
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# define CHAR_BIT 8
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#endif
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/* The extra casts work around common compiler bugs. */
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#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
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It is necessary at least when t == time_t. */
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#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
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? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
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#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
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#ifndef INT_MAX
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# define INT_MAX TYPE_MAXIMUM (int)
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#endif
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#ifndef PATH_MAX
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/* There might be a better way to handle this case, but note:
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- the value shouldn't be anywhere near INT_MAX, and
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- the value shouldn't be so big that the local declaration, below,
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blows the stack. */
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# define PATH_MAX 40000
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#endif
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/* The length of this name must be 8. */
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#define DIR_NAME "confdir3"
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int
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main ()
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{
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/* The '9' comes from strlen (DIR_NAME) + 1. */
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#if INT_MAX - 9 <= PATH_MAX
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/* FIXME: Assuming there's a system for which this is true -- Hurd?,
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this should be done in a compile test. */
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exit (0);
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#else
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char buf[PATH_MAX + 20];
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char *cwd = getcwd (buf, PATH_MAX);
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size_t cwd_len;
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int fail = 0;
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size_t n_chdirs = 0;
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if (cwd == NULL)
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exit (1);
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cwd_len = strlen (cwd);
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while (1)
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{
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char *c;
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size_t len;
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cwd_len += 1 + strlen (DIR_NAME);
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/* If mkdir or chdir fails, be pessimistic and consider that
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as a failure, too. */
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if (mkdir (DIR_NAME, 0700) < 0 || chdir (DIR_NAME) < 0)
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{
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fail = 1;
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break;
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}
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if ((c = getcwd (buf, PATH_MAX)) == NULL)
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{
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/* This allows any failure to indicate there is no bug.
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FIXME: check errno? */
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break;
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}
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if ((len = strlen (c)) != cwd_len)
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{
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fail = 1;
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break;
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}
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++n_chdirs;
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if (PATH_MAX < len)
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break;
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}
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/* Leaving behind such a deep directory is not polite.
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So clean up here, right away, even though the driving
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shell script would also clean up. */
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{
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size_t i;
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/* Unlink first, in case the chdir failed. */
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unlink (DIR_NAME);
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for (i = 0; i <= n_chdirs; i++)
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{
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if (chdir ("..") < 0)
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break;
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rmdir (DIR_NAME);
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}
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}
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exit (fail);
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#endif
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}
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]])],
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[gl_cv_func_getcwd_vs_path_max=yes],
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[gl_cv_func_getcwd_vs_path_max=no],
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[gl_cv_func_getcwd_vs_path_max=no])])
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if test $gl_cv_func_getcwd_vs_path_max = yes; then
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AC_LIBOBJ(getcwd)
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AC_DEFINE(getcwd, rpl_getcwd,
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[Define to rpl_getcwd if the wrapper function should be used.])
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fi
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])
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