1 /* Utilities for reading/writing fstab, mtab, etc. 2 Copyright (C) 1995-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 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 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _MNTENT_H 20 #define _MNTENT_H 1 21 22 #include <features.h> 23 #include <paths.h> 24 #include <bits/types/FILE.h> 25 26 /* File listing canonical interesting mount points. */ 27 #define MNTTAB _PATH_MNTTAB /* Deprecated alias. */ 28 29 /* File listing currently active mount points. */ 30 #define MOUNTED _PATH_MOUNTED /* Deprecated alias. */ 31 32 33 /* General filesystem types. */ 34 #define MNTTYPE_IGNORE "ignore" /* Ignore this entry. */ 35 #define MNTTYPE_NFS "nfs" /* Network file system. */ 36 #define MNTTYPE_SWAP "swap" /* Swap device. */ 37 38 39 /* Generic mount options. */ 40 #define MNTOPT_DEFAULTS "defaults" /* Use all default options. */ 41 #define MNTOPT_RO "ro" /* Read only. */ 42 #define MNTOPT_RW "rw" /* Read/write. */ 43 #define MNTOPT_SUID "suid" /* Set uid allowed. */ 44 #define MNTOPT_NOSUID "nosuid" /* No set uid allowed. */ 45 #define MNTOPT_NOAUTO "noauto" /* Do not auto mount. */ 46 47 48 __BEGIN_DECLS 49 50 /* Structure describing a mount table entry. */ 51 struct mntent 52 { 53 char *mnt_fsname; /* Device or server for filesystem. */ 54 char *mnt_dir; /* Directory mounted on. */ 55 char *mnt_type; /* Type of filesystem: ufs, nfs, etc. */ 56 char *mnt_opts; /* Comma-separated options for fs. */ 57 int mnt_freq; /* Dump frequency (in days). */ 58 int mnt_passno; /* Pass number for `fsck'. */ 59 }; 60 61 62 /* Prepare to begin reading and/or writing mount table entries from the 63 beginning of FILE. MODE is as for `fopen'. */ 64 extern FILE *setmntent (const char *__file, const char *__mode) __THROW; 65 66 /* Read one mount table entry from STREAM. Returns a pointer to storage 67 reused on the next call, or null for EOF or error (use feof/ferror to 68 check). */ 69 extern struct mntent *getmntent (FILE *__stream) __THROW; 70 71 #ifdef __USE_MISC 72 /* Reentrant version of the above function. */ 73 extern struct mntent *getmntent_r (FILE *__restrict __stream, 74 struct mntent *__restrict __result, 75 char *__restrict __buffer, 76 int __bufsize) __THROW; 77 #endif 78 79 /* Write the mount table entry described by MNT to STREAM. 80 Return zero on success, nonzero on failure. */ 81 extern int addmntent (FILE *__restrict __stream, 82 const struct mntent *__restrict __mnt) __THROW; 83 84 /* Close a stream opened with `setmntent'. */ 85 extern int endmntent (FILE *__stream) __THROW; 86 87 /* Search MNT->mnt_opts for an option matching OPT. 88 Returns the address of the substring, or null if none found. */ 89 extern char *hasmntopt (const struct mntent *__mnt, 90 const char *__opt) __THROW; 91 92 93 __END_DECLS 94 95 #endif /* mntent.h */ 96