OpenCoverage

find-mount-point.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/coreutils/src/src/find-mount-point.c
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1/* find-mount-point.c -- find the root mount point for a file.-
2 Copyright (C) 2010-2018 Free Software Foundation, Inc.-
3-
4 This program is free software: you can redistribute it and/or modify-
5 it under the terms of the GNU General Public License as published by-
6 the Free Software Foundation, either version 3 of the License, or-
7 (at your option) any later version.-
8-
9 This program is distributed in the hope that it will be useful,-
10 but WITHOUT ANY WARRANTY; without even the implied warranty of-
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
12 GNU General Public License for more details.-
13-
14 You should have received a copy of the GNU General Public License-
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */-
16-
17#include <config.h>-
18#include <sys/types.h>-
19-
20#include "system.h"-
21#include "die.h"-
22#include "error.h"-
23#include "save-cwd.h"-
24#include "xgetcwd.h"-
25#include "find-mount-point.h"-
26-
27/* Return the root mountpoint of the file system on which FILE exists, in-
28 malloced storage. FILE_STAT should be the result of stating FILE.-
29 Give a diagnostic and return NULL if unable to determine the mount point.-
30 Exit if unable to restore current working directory. */-
31extern char *-
32find_mount_point (char const *file, struct stat const *file_stat)-
33{-
34 struct saved_cwd cwd;-
35 struct stat last_stat;-
36 char *mp = NULL; /* The malloc'd mount point. */-
37-
38 if (save_cwd (&cwd) != 0)
save_cwd (&cwd) != 0Description
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • df
  • stat
0-6
39 {-
40 error (0, errno, _("cannot get current directory"));-
41 return NULL;
never executed: return ((void *)0) ;
0
42 }-
43-
44 if (S_ISDIR (file_stat->st_mode))
(((( file_stat... == (0040000))Description
TRUEevaluated 6 times by 2 tests
Evaluated by:
  • df
  • stat
FALSEnever evaluated
0-6
45 /* FILE is a directory, so just chdir there directly. */-
46 {-
47 last_stat = *file_stat;-
48 if (chdir (file) < 0)
chdir (file) < 0Description
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • df
  • stat
0-6
49 {-
50 error (0, errno, _("cannot change to directory %s"), quoteaf (file));-
51 return NULL;
never executed: return ((void *)0) ;
0
52 }-
53 }
executed 6 times by 2 tests: end of block
Executed by:
  • df
  • stat
6
54 else-
55 /* FILE is some other kind of file; use its directory. */-
56 {-
57 char *xdir = dir_name (file);-
58 char *dir;-
59 ASSIGN_STRDUPA (dir, xdir);-
60 free (xdir);-
61-
62 if (chdir (dir) < 0)
chdir (dir) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
63 {-
64 error (0, errno, _("cannot change to directory %s"), quoteaf (dir));-
65 return NULL;
never executed: return ((void *)0) ;
0
66 }-
67-
68 if (stat (".", &last_stat) < 0)
stat (".", &last_stat) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
69 {-
70 error (0, errno, _("cannot stat current directory (now %s)"),-
71 quoteaf (dir));-
72 goto done;
never executed: goto done;
0
73 }-
74 }
never executed: end of block
0
75-
76 /* Now walk up FILE's parents until we find another file system or /,-
77 chdiring as we go. LAST_STAT holds stat information for the last place-
78 we visited. */-
79 while (true)-
80 {-
81 struct stat st;-
82 if (stat ("..", &st) < 0)
stat ("..", &st) < 0Description
TRUEnever evaluated
FALSEevaluated 48 times by 2 tests
Evaluated by:
  • df
  • stat
0-48
83 {-
84 error (0, errno, _("cannot stat %s"), quoteaf (".."));-
85 goto done;
never executed: goto done;
0
86 }-
87 if (st.st_dev != last_stat.st_dev || st.st_ino == last_stat.st_ino)
st.st_dev != last_stat.st_devDescription
TRUEnever evaluated
FALSEevaluated 48 times by 2 tests
Evaluated by:
  • df
  • stat
st.st_ino == last_stat.st_inoDescription
TRUEevaluated 6 times by 2 tests
Evaluated by:
  • df
  • stat
FALSEevaluated 42 times by 2 tests
Evaluated by:
  • df
  • stat
0-48
88 /* cwd is the mount point. */-
89 break;
executed 6 times by 2 tests: break;
Executed by:
  • df
  • stat
6
90 if (chdir ("..") < 0)
chdir ("..") < 0Description
TRUEnever evaluated
FALSEevaluated 42 times by 2 tests
Evaluated by:
  • df
  • stat
0-42
91 {-
92 error (0, errno, _("cannot change to directory %s"), quoteaf (".."));-
93 goto done;
never executed: goto done;
0
94 }-
95 last_stat = st;-
96 }
executed 42 times by 2 tests: end of block
Executed by:
  • df
  • stat
42
97-
98 /* Finally reached a mount point, see what it's called. */-
99 mp = xgetcwd ();-
100-
101done:
code before this statement executed 6 times by 2 tests: done:
Executed by:
  • df
  • stat
6
102 /* Restore the original cwd. */-
103 {-
104 int save_errno = errno;-
105 if (restore_cwd (&cwd) != 0)
restore_cwd (&cwd) != 0Description
TRUEnever evaluated
FALSEevaluated 6 times by 2 tests
Evaluated by:
  • df
  • stat
0-6
106 die (EXIT_FAILURE, errno,
never executed: ((!!sizeof (struct { _Static_assert ( 1 , "verify_expr (" "1" ", " "(error (1, (*__errno_location ()), dcgettext (((void *)0), \"failed to return to initial working directory\", 5)), assume (false))" ")"); int _gl_dummy; })) ? ((error ( 1 , (*__errno_loca... initial working directory" , 5) ), (( 0 ) ? (void) 0 : __builtin_unreachable ()))) : ((error ( 1 , (*__errno_location ()) , dcgettext (((void *)0), "failed to return to initial working directory" , 5) ), (( 0 ) ? (void) 0 : __builtin_unreachable ())))) ;
0
107 _("failed to return to initial working directory"));
never executed: ((!!sizeof (struct { _Static_assert ( 1 , "verify_expr (" "1" ", " "(error (1, (*__errno_location ()), dcgettext (((void *)0), \"failed to return to initial working directory\", 5)), assume (false))" ")"); int _gl_dummy; })) ? ((error ( 1 , (*__errno_loca... initial working directory" , 5) ), (( 0 ) ? (void) 0 : __builtin_unreachable ()))) : ((error ( 1 , (*__errno_location ()) , dcgettext (((void *)0), "failed to return to initial working directory" , 5) ), (( 0 ) ? (void) 0 : __builtin_unreachable ())))) ;
0
108 free_cwd (&cwd);-
109 errno = save_errno;-
110 }-
111-
112 return mp;
executed 6 times by 2 tests: return mp;
Executed by:
  • df
  • stat
6
113}-
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