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FreeBSD 11.0 - man page for getfstype (freebsd section 3)

GETFSENT(3)						   BSD Library Functions Manual 					       GETFSENT(3)

getfsent, getfsspec, getfsfile, setfsent, endfsent -- get file system descriptor file entry
Standard C Library (libc, -lc)
#include <fstab.h> struct fstab * getfsent(void); struct fstab * getfsspec(const char *spec); struct fstab * getfsfile(const char *file); int setfsent(void); void endfsent(void); void setfstab(const char *file); const char * getfstab(void);
The getfsent(), getfsspec(), and 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, <fstab.h>. 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 */ }; The fields have meanings described in fstab(5). The setfsent() function opens the file (closing any previously opened file) or rewinds it if it is already open. The endfsent() function closes the file. The setfstab() function sets the file to be used by subsequent operations. The value set by setfstab() does not persist across calls to endfsent(). The getfstab() function returns the name of the file that will be used. The getfsspec() and getfsfile() functions search the entire file (opening it if necessary) for a matching special file name or file system file name. For programs wishing to read the entire database, getfsent() reads the next entry (opening the file if necessary). All entries in the file with a type field equivalent to FSTAB_XX are ignored.
The getfsent(), getfsspec(), and getfsfile() functions return a NULL pointer on EOF or error. The setfsent() function returns 0 on failure, 1 on success. The endfsent() function returns nothing.
PATH_FSTAB If the environment variable PATH_FSTAB is set, all operations are performed against the specified file. PATH_FSTAB will not be honored if the process environment or memory address space is considered ``tainted''. (See issetugid(2) for more information.)
The getfsent() function appeared in 4.0BSD; the endfsent(), getfsfile(), getfsspec(), and setfsent() functions appeared in 4.3BSD; the setfstab() and getfstab() functions appeared in FreeBSD 5.1.
These functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it.
April 7, 2003 BSD