1 /* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library 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 GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 /* The kernel hints us if the f_flags is valid */ 20 #define ST_VALID 0x0020 21 22 /* Now fill in the fields we have information for. */ 23 buf->f_bsize = fsbuf.f_bsize; 24 #ifdef _STATFS_F_FRSIZE 25 buf->f_frsize = fsbuf.f_frsize; 26 #else 27 /* No support for f_frsize so set it to the full block size. */ 28 buf->f_frsize = fsbuf.f_bsize; 29 #endif 30 buf->f_blocks = fsbuf.f_blocks; 31 buf->f_bfree = fsbuf.f_bfree; 32 buf->f_bavail = fsbuf.f_bavail; 33 buf->f_files = fsbuf.f_files; 34 buf->f_ffree = fsbuf.f_ffree; 35 if (sizeof (buf->f_fsid) == sizeof (fsbuf.f_fsid)) 36 buf->f_fsid = (fsbuf.f_fsid.__val[0] 37 | ((unsigned long long int) fsbuf.f_fsid.__val[1] 38 << (8 * (sizeof (buf->f_fsid) 39 - sizeof (fsbuf.f_fsid.__val[0]))))); 40 else 41 /* We cannot help here. The statvfs element is not large enough to 42 contain both words of the statfs f_fsid field. */ 43 buf->f_fsid = fsbuf.f_fsid.__val[0]; 44 #ifdef _STATVFSBUF_F_UNUSED 45 buf->__f_unused = 0; 46 #endif 47 buf->f_namemax = fsbuf.f_namelen; 48 memset (buf->__f_spare, '\0', sizeof(buf->__f_spare)); 49 /* XXX I have no idea how to compute f_favail. Any idea??? */ 50 buf->f_favail = buf->f_ffree; 51 52 /* Determining the flags is tricky. We have to read /proc/mounts or 53 the /etc/mtab file and search for the entry which matches the given 54 file. The way we can test for matching filesystem is using the 55 device number. */ 56 buf->f_flag = 0; 57 if (STAT (&st) >= 0 58 #ifdef _STATFS_F_FLAGS 59 && (fsbuf.f_flags & ST_VALID) == 0 60 #endif 61 ) { 62 int save_errno = errno; 63 struct mntent mntbuf; 64 FILE *mtab; 65 66 mtab = setmntent ("/proc/mounts", "r"); 67 if (mtab == NULL) 68 mtab = setmntent (_PATH_MOUNTED, "r"); 69 if (mtab != NULL) { 70 char tmpbuf[1024]; 71 72 while (getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf))) { 73 struct stat fsst; 74 75 /* Find out about the device the current entry is for. */ 76 if (stat (mntbuf.mnt_dir, &fsst) >= 0 77 && st.st_dev == fsst.st_dev) { 78 /* Bingo, we found the entry for the device FD is on. 79 Now interpret the option string. */ 80 char *cp = mntbuf.mnt_opts; 81 char *opt; 82 83 while ((opt = strsep (&cp, ",")) != NULL) 84 if (strcmp (opt, "ro") == 0) 85 buf->f_flag |= ST_RDONLY; 86 else if (strcmp (opt, "nosuid") == 0) 87 buf->f_flag |= ST_NOSUID; 88 #ifdef __USE_GNU 89 else if (strcmp (opt, "noexec") == 0) 90 buf->f_flag |= ST_NOEXEC; 91 else if (strcmp (opt, "nodev") == 0) 92 buf->f_flag |= ST_NODEV; 93 else if (strcmp (opt, "sync") == 0) 94 buf->f_flag |= ST_SYNCHRONOUS; 95 else if (strcmp (opt, "mand") == 0) 96 buf->f_flag |= ST_MANDLOCK; 97 else if (strcmp (opt, "noatime") == 0) 98 buf->f_flag |= ST_NOATIME; 99 else if (strcmp (opt, "nodiratime") == 0) 100 buf->f_flag |= ST_NODIRATIME; 101 else if (strcmp (opt, "relatime") == 0) 102 buf->f_flag |= ST_RELATIME; 103 #endif 104 /* We can stop looking for more entries. */ 105 break; 106 } 107 } 108 /* Close the file. */ 109 endmntent (mtab); 110 } 111 __set_errno (save_errno); 112 } 113 #ifdef _STATFS_F_FLAGS 114 else 115 buf->f_flag = fsbuf.f_flags ^ ST_VALID; 116 #endif 117