#include <stdio.h> #include <mntent.h> FILE *setmntent(const char *filename, const char *type); struct mntent *getmntent(FILE *stream); int addmntent(FILE *stream, const struct mntent *mnt); int endmntent(FILE *streamp); char *hasmntopt(const struct mntent *mnt, const char *opt); /* GNU extension */ #include <mntent.h> struct mntent *getmntent_r(FILE *streamp, struct mntent *mntbuf, char *buf, int buflen);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getmntent_r():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
The setmntent() function opens the filesystem description file filename 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 fopen(3).
The getmntent() function reads the next line of the filesystem description file from stream 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 stream.
The endmntent() function closes the stream associated with the filesystem description file.
The hasmntopt() function scans the mnt_opts field (see below) of the mntent structure mnt for a substring that matches opt. See <mntent.h> and mount(8) for valid mount options.
The reentrant getmntent_r() function is similar to getmntent(), but stores the struct mount in the provided *mntbuf and stores the strings pointed to by the entries in that struct in the provided array buf of size buflen.
The mntent structure is defined in <mntent.h> as follows:
struct mntent {
char *mnt_fsname; /* name of mounted filesystem */
char *mnt_dir; /* filesystem 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 */
};
Since fields in the mtab and fstab files are separated by whitespace, octal escapes are used to represent the four characters space (\040), tab (\011), newline (\012) and backslash (\134) in those files when they occur in one of the four strings in a mntent structure. The routines addmntent() and getmntent() will convert from string representation to escaped representation and back.
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.
/etc/fstab filesystem description file /etc/mtab mounted filesystem description file
| Interface | Attribute | Value |
| setmntent(), endmntent(), hasmntopt() | Thread safety | MT-Safe |
| getmntent() | Thread safety | MT-Unsafe race:mntentbuf locale |
| addmntent() | Thread safety | MT-Safe race:stream locale |
| getmntent_r() | Thread safety | MT-Safe locale |