GETMNTENT Section: Linux Programmer's Manual (3) Updated: June 27, 2025 Index   NAME getmntent, setmntent, addmntent, endmntent, hasmntopt - get file system descriptor file entry   SYNOPSIS #include <stdio.h> #include <mntent.h> FILE *setmntent(const char *filename, const char *type); struct mntent *getmntent(FILE *filep); int addmntent(FILE *filep, const struct mntent *mnt); int endmntent(FILE *filep); char *hasmntopt(const struct mntent *mnt, const char *opt);   DESCRIPTION These routines are used to access the file system description file /etc/fstab and the mounted file system description file /etc/mtab. The setmntent() function opens the file system description file filep and returns a file pointer which can be used by getmntent(). The argument type is the type of access required and can take the same values as the mode argument of The getmntent() function reads the next line from the file system description file filep and returns a pointer to a structure containing the broken out fields from a line in the file. The pointer points to a static area of memory which is overwritten by subsequent calls to getmntent(). The addmntent() function adds the mntent structure mnt to the end of the open file filep. The endmntent() function closes the file system description file filep. The hasmntopt() function scans the mnt_opts field (see below) of the mntent structure mnt for a substring that matches opt. See <mntent.h> for valid mount options. The mntent structure is defined in <mntent.h> as follows: struct mntent { char *mnt_fsname; /* name of mounted file system */ char *mnt_dir; /* file system path prefix */ char *mnt_type; /* mount type (see mntent.h) */ char *mnt_opts; /* mount options (see mntent.h) */ int mnt_freq; /* dump frequency in days */ int mnt_passno; /* pass number on parallel fsck */ };   RETURN VALUE The getmntent() function returns a pointer to the mntent structure or NULL on failure. The addmntent() function returns 0 on success and 1 on failure. The endmntent() function always returns 1. The hasmntopt() function returns the address of the substring if a match is found and NULL otherwise.   FILES /etc/fstab file system description file /etc/mtab mounted file system description file   CONFORMING TO BSD 4.3   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE FILES CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:02 GMT, March 24, 2025