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@(#)getfsent.3 8.1 (Berkeley) 6/4/93
$FreeBSD: releng/10.2/lib/libc/gen/getfsent.3 165903 2007-01-09 00:28:16Z imp $
.Dd April 7, 2003 .Dt GETFSENT 3 .Os .Sh NAME .Nm getfsent , .Nm getfsspec , .Nm getfsfile , .Nm setfsent , .Nm endfsent .Nd get file system descriptor file entry .Sh LIBRARY .Lb libc .Sh SYNOPSIS n fstab.h .Ft "struct fstab *" .Fn getfsent void .Ft "struct fstab *" .Fn getfsspec "const char *spec" .Ft "struct fstab *" .Fn getfsfile "const char *file" .Ft int .Fn setfsent void .Ft void .Fn endfsent void .Ft void .Fn setfstab "const char *file" .Ft "const char *" .Fn getfstab void .Sh DESCRIPTION The .Fn getfsent , .Fn getfsspec , and .Fn getfsfile functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the file system description file, n fstab.h . d -literal -offset indent struct fstab { char *fs_spec; /* block special device name */ char *fs_file; /* file system path prefix */ char *fs_vfstype; /* File system type, ufs, nfs */ char *fs_mntops; /* Mount options ala -o */ char *fs_type; /* FSTAB_* from fs_mntops */ int fs_freq; /* dump frequency, in days */ int fs_passno; /* pass number on parallel fsck */ }; .Ed
p The fields have meanings described in .Xr fstab 5 .
p The .Fn setfsent function opens the file (closing any previously opened file) or rewinds it if it is already open.
p The .Fn endfsent function closes the file.
p The .Fn setfstab function sets the file to be used by subsequent operations. The value set by .Fn setfstab does not persist across calls to .Fn endfsent .
p The .Fn getfstab function returns the name of the file that will be used.
p The .Fn getfsspec and .Fn getfsfile functions search the entire file (opening it if necessary) for a matching special file name or file system file name.
p For programs wishing to read the entire database, .Fn getfsent reads the next entry (opening the file if necessary).
p All entries in the file with a type field equivalent to .Dv FSTAB_XX are ignored. .Sh RETURN VALUES The .Fn getfsent , .Fn getfsspec , and .Fn getfsfile functions return a .Dv NULL pointer on .Dv EOF or error. The .Fn setfsent function returns 0 on failure, 1 on success. The .Fn endfsent function returns nothing. .Sh ENVIRONMENT l -tag -width ".Ev PATH_FSTAB" t Ev PATH_FSTAB If the environment variable .Ev PATH_FSTAB is set, all operations are performed against the specified file. .Ev PATH_FSTAB will not be honored if the process environment or memory address space is considered .Dq tainted . (See .Xr issetugid 2 for more information.) .El .Sh FILES l -tag -width /etc/fstab -compact t Pa /etc/fstab .El .Sh SEE ALSO .Xr fstab 5 .Sh HISTORY The .Fn getfsent function appeared in x 4.0 ; the .Fn endfsent , .Fn getfsfile , .Fn getfsspec , and .Fn setfsent functions appeared in x 4.3 ; the .Fn setfstab and .Fn getfstab functions appeared in .Fx 5.1 . .Sh BUGS These functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it.