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opendir-safer.c

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/home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/opendir-safer.c

Source code

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1 /* Invoke opendir, but avoid some glitches. -

2 -

4 -

5 This program is free software: you can redistribute it and/or modify -

6 it under the terms of the GNU General Public License as published by -

7 the Free Software Foundation; either version 3 of the License, or -

8 (at your option) any later version. -

9 -

10 This program is distributed in the hope that it will be useful, -

11 but WITHOUT ANY WARRANTY; without even the implied warranty of -

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -

13 GNU General Public License for more details. -

14 -

15 You should have received a copy of the GNU General Public License -

16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ -

17 -

18 /* Written by Eric Blake. */ -

19 -

20 #include <config.h> -

21 -

22 #include "dirent-safer.h" -

23 -

24 #include <errno.h> -

25 #include <fcntl.h> -

26 #include <unistd.h> -

27 -

28 /* Like opendir, but do not clobber stdin, stdout, or stderr. */ -

29 -

30 DIR * -

31 opendir_safer (char const *name) -

32 { -

33 DIR *dp = opendir (name); -

34 -

if (dp)

dp	Description
TRUE	evaluated 34049 times by 2 tests Evaluated by: cp mv
FALSE	never evaluated

0-34049

36 { -

37 int fd = dirfd (dp); -

38 -

if (0 <= fd && fd <= STDERR_FILENO)

0 <= fd	Description
TRUE	evaluated 34049 times by 2 tests Evaluated by: cp mv
FALSE	never evaluated

fd <= 2	Description
TRUE	never evaluated
FALSE	evaluated 34049 times by 2 tests Evaluated by: cp mv

0-34049

40 { -

41 /* If fdopendir is native (as on Linux), then it is safe to -

42 assume dirfd(fdopendir(n))==n. If we are using the -

43 gnulib module fdopendir, then this guarantee is not met, -

44 but fdopendir recursively calls opendir_safer up to 3 -

45 times to at least get a safe fd. If fdopendir is not -

46 present but dirfd is accurate (as on cygwin 1.5.x), then -

47 we recurse up to 3 times ourselves. Finally, if dirfd -

48 always fails (as on mingw), then we are already safe. */ -

49 DIR *newdp; -

50 int e; -

51 #if HAVE_FDOPENDIR || GNULIB_FDOPENDIR -

52 int f = fcntl (fd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1); -

if (f < 0)

f < 0	Description
TRUE	never evaluated
FALSE	never evaluated

54 { -

55 e = errno; -

56 newdp = NULL; -

}

never executed: end of block

58 else -

59 { -

60 newdp = fdopendir (f); -

61 e = errno; -

if (! newdp)

! newdp	Description
TRUE	never evaluated
FALSE	never evaluated

close (f);

never executed: close (f);

}

never executed: end of block

65 #else /* !FDOPENDIR */ -

66 newdp = opendir_safer (name); -

67 e = errno; -

68 #endif -

69 closedir (dp); -

70 errno = e; -

71 dp = newdp; -

}

never executed: end of block

}

executed 34049 times by 2 tests: end of block

Executed by:

34049

74 -

return dp;

executed 34049 times by 2 tests: return dp;

Executed by:

34049

76 } -

Source code

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