X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-getcwd.c;h=e9832f0ea6a975be3b5c8d45c3fddb1ed9bfbd95;hb=d1fa59e00fd51d96f8b946f01dde859275d84569;hp=46acf8ad730da417408d5586d0f6d162f195db26;hpb=ba2d9dffa77a8a1ff255b51820d2d791c909e779;p=gnulib.git diff --git a/tests/test-getcwd.c b/tests/test-getcwd.c index 46acf8ad7..e9832f0ea 100644 --- a/tests/test-getcwd.c +++ b/tests/test-getcwd.c @@ -1,5 +1,5 @@ /* Test of getcwd() function. - Copyright (C) 2009 Free Software Foundation, Inc. + Copyright (C) 2009-2011 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -18,59 +18,211 @@ #include -#include "signature.h" -SIGNATURE_CHECK (getcwd, char *, (char *, size_t)); - +#include +#include +#include #include #include #include +#include +#include "pathmax.h" #include "macros.h" -int -main (int argc, char **argv) +#if ! HAVE_GETPAGESIZE +# define getpagesize() 0 +#endif + +/* This size is chosen to be larger than PATH_MAX (4k), yet smaller than + the 16kB pagesize on ia64 linux. Those conditions make the code below + trigger a bug in glibc's getcwd implementation before 2.4.90-10. */ +#define TARGET_LEN (5 * 1024) + +/* Keep this test in sync with m4/getcwd-abort-bug.m4. */ +static int +test_abort_bug (void) { - char *pwd1; - char *pwd2; - /* If the user provides an argument, attempt to chdir there first. */ - if (1 < argc) + char const *dir_name = "confdir-14B---"; + char *cwd; + size_t initial_cwd_len; + int fail = 0; + size_t desired_depth; + size_t d; + +#ifdef PATH_MAX + /* The bug is triggered when PATH_MAX < getpagesize (), so skip + this relatively expensive and invasive test if that's not true. */ + if (getpagesize () <= PATH_MAX) + return 0; +#endif + + cwd = getcwd (NULL, 0); + if (cwd == NULL) + return 2; + + initial_cwd_len = strlen (cwd); + free (cwd); + desired_depth = ((TARGET_LEN - 1 - initial_cwd_len) + / (1 + strlen (dir_name))); + for (d = 0; d < desired_depth; d++) { - if (chdir (argv[1]) == 0) - printf ("changed to directory %s\n", argv[1]); + if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0) + { + if (! (errno == ERANGE || errno == ENAMETOOLONG || errno == ENOENT)) + fail = 3; /* Unable to construct deep hierarchy. */ + break; + } } - pwd1 = getcwd (NULL, 0); - ASSERT (pwd1 && *pwd1); - if (1 < argc) - printf ("cwd=%s\n", pwd1); + /* If libc has the bug in question, this invocation of getcwd + results in a failed assertion. */ + cwd = getcwd (NULL, 0); + if (cwd == NULL) + fail = 4; /* getcwd didn't assert, but it failed for a long name + where the answer could have been learned. */ + free (cwd); + + /* Call rmdir first, in case the above chdir failed. */ + rmdir (dir_name); + while (0 < d--) + { + if (chdir ("..") < 0) + { + fail = 5; + break; + } + rmdir (dir_name); + } + + return fail; +} + +/* The length of this name must be 8. */ +#define DIR_NAME "confdir3" +#define DIR_NAME_LEN 8 +#define DIR_NAME_SIZE (DIR_NAME_LEN + 1) + +/* The length of "../". */ +#define DOTDOTSLASH_LEN 3 + +/* Leftover bytes in the buffer, to work around library or OS bugs. */ +#define BUF_SLOP 20 + +/* Keep this test in sync with m4/getcwd-path-max.m4. */ +static int +test_long_name (void) +{ +#ifndef PATH_MAX + /* The Hurd doesn't define this, so getcwd can't exhibit the bug -- + at least not on a local file system. And if we were to start worrying + about remote file systems, we'd have to enable the wrapper function + all of the time, just to be safe. That's not worth the cost. */ + return 0; +#elif ((INT_MAX / (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) \ + - DIR_NAME_SIZE - BUF_SLOP) \ + <= PATH_MAX) + /* FIXME: Assuming there's a system for which this is true, + this should be done in a compile test. */ + return 0; +#else + char buf[PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) + + DIR_NAME_SIZE + BUF_SLOP]; + char *cwd = getcwd (buf, PATH_MAX); + size_t initial_cwd_len; + size_t cwd_len; + int fail = 0; + size_t n_chdirs = 0; + + if (cwd == NULL) + return 10; + + cwd_len = initial_cwd_len = strlen (cwd); + + while (1) + { + size_t dotdot_max = PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN); + char *c = NULL; + + cwd_len += DIR_NAME_SIZE; + /* If mkdir or chdir fails, it could be that this system cannot create + any file with an absolute name longer than PATH_MAX, such as cygwin. + If so, leave fail as 0, because the current working directory can't + be too long for getcwd if it can't even be created. For other + errors, be pessimistic and consider that as a failure, too. */ + if (mkdir (DIR_NAME, S_IRWXU) < 0 || chdir (DIR_NAME) < 0) + { + if (! (errno == ERANGE || errno == ENAMETOOLONG || errno == ENOENT)) + fail = 20; + break; + } + + if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE) + { + c = getcwd (buf, PATH_MAX); + if (!c && errno == ENOENT) + { + fail = 11; + break; + } + if (c || ! (errno == ERANGE || errno == ENAMETOOLONG)) + { + fail = 21; + break; + } + } - /* Make sure the result is usable. */ - ASSERT (chdir (pwd1) == 0); - ASSERT (chdir ("././.") == 0); + if (dotdot_max <= cwd_len - initial_cwd_len) + { + if (dotdot_max + DIR_NAME_SIZE < cwd_len - initial_cwd_len) + break; + c = getcwd (buf, cwd_len + 1); + if (!c) + { + if (! (errno == ERANGE || errno == ENOENT + || errno == ENAMETOOLONG)) + { + fail = 22; + break; + } + if (AT_FDCWD || errno == ERANGE || errno == ENOENT) + { + fail = 12; + break; + } + } + } - /* Make sure that result is normalized. */ - pwd2 = getcwd (NULL, 0); - ASSERT (pwd2); - ASSERT (strcmp (pwd1, pwd2) == 0); - free (pwd2); + if (c && strlen (c) != cwd_len) + { + fail = 23; + break; + } + ++n_chdirs; + } + + /* Leaving behind such a deep directory is not polite. + So clean up here, right away, even though the driving + shell script would also clean up. */ { - size_t len = strlen (pwd1); - ssize_t i = len - 10; - if (i < 0) - i = 0; - pwd2 = malloc (len + 2); - for ( ; i < len; i++) - ASSERT (getcwd (pwd2, i) == NULL); - pwd2 = getcwd (pwd2, len + 1); - ASSERT (pwd2); - pwd2[len] = '/'; - pwd2[len + 1] = '\0'; + size_t i; + + /* Try rmdir first, in case the chdir failed. */ + rmdir (DIR_NAME); + for (i = 0; i <= n_chdirs; i++) + { + if (chdir ("..") < 0) + break; + if (rmdir (DIR_NAME) != 0) + break; + } } - ASSERT (strstr (pwd2, "/./") == NULL); - ASSERT (strstr (pwd2, "/../") == NULL); - free (pwd1); - free (pwd2); + return fail; +#endif +} - return 0; +int +main (int argc, char **argv) +{ + return test_abort_bug () + test_long_name (); }