minix/lib/libcompat_minix/mtab.c

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/* This package consists of 4 routines for handling the /etc/mtab file.
* The /etc/mtab file contains information about the root and mounted file
* systems as a series of lines, each one with exactly four fields separated
* by one space as follows:
*
* special mounted_on version rw_flag
*
* where
* special is the name of the block special file
* mounted_on is the directory on which it is mounted
* version is either 1 or 2 for MINIX V1 and V2 file systems
* rw_flag is rw or ro for read/write or read only
*
* An example /etc/mtab:
*
* /dev/ram / 2 rw
* /dev/hd1 /usr 2 rw
* /dev/fd0 /user 1 ro
*
*
* The four routines for handling /etc/mtab are as follows. They use two
* (hidden) internal buffers, mtab_in for input and mtab_out for output.
*
* load_mtab(&prog_name) - read /etc/mtab into mtab_in
* get_mtab_entry(&s1, &s2, &s3, &s4) - arrays that are filled in
*
* If load_mtab works, it returns 0. If it fails, it prints its own error
* message on stderr and returns -1. When get_mtab_entry
* runs out of entries to return, it sets the first pointer to NULL and returns
* -1 instead of 0.
*/
#include <sys/types.h>
Build NetBSD libc library in world in ELF mode. 3 sets of libraries are built now: . ack: all libraries that ack can compile (/usr/lib/i386/) . clang+elf: all libraries with minix headers (/usr/lib/) . clang+elf: all libraries with netbsd headers (/usr/netbsd/) Once everything can be compiled with netbsd libraries and headers, the /usr/netbsd hierarchy will be obsolete and its libraries compiled with netbsd headers will be installed in /usr/lib, and its headers in /usr/include. (i.e. minix libc and current minix headers set will be gone.) To use the NetBSD libc system (libraries + headers) before it is the default libc, see: http://wiki.minix3.org/en/DevelopersGuide/UsingNetBSDCode This wiki page also documents the maintenance of the patch files of minix-specific changes to imported NetBSD code. Changes in this commit: . libsys: Add NBSD compilation and create a safe NBSD-based libc. . Port rest of libraries (except libddekit) to new header system. . Enable compilation of libddekit with new headers. . Enable kernel compilation with new headers. . Enable drivers compilation with new headers. . Port legacy commands to new headers and libc. . Port servers to new headers. . Add <sys/sigcontext.h> in compat library. . Remove dependency file in tree. . Enable compilation of common/lib/libc/atomic in libsys . Do not generate RCSID strings in libc. . Temporarily disable zoneinfo as they are incompatible with NetBSD format . obj-nbsd for .gitignore . Procfs: use only integer arithmetic. (Antoine Leca) . Increase ramdisk size to create NBSD-based images. . Remove INCSYMLINKS handling hack. . Add nbsd_include/sys/exec_elf.h . Enable ELF compilation with NBSD libc. . Add 'make nbsdsrc' in tools to download reference NetBSD sources. . Automate minix-port.patch creation. . Avoid using fstavfs() as it is *extremely* slow and unneeded. . Set err() as PRIVATE to avoid name clash with libc. . [NBSD] servers/vm: remove compilation warnings. . u32 is not a long in NBSD headers. . UPDATING info on netbsd hierarchy . commands fixes for netbsd libc
2011-04-27 15:00:52 +02:00
#include <lib.h>
#include <minix/minlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#define BUF_SIZE 512 /* size of the /etc/mtab buffer */
char *etc_mtab = "/etc/mtab"; /* name of the /etc/mtab file */
static char mtab_in[BUF_SIZE+1]; /* holds /etc/mtab when it is read in */
static char *iptr = mtab_in; /* pointer to next line to feed out. */
int load_mtab(char *prog_name );
int get_mtab_entry(char dev[PATH_MAX], char mount_point[PATH_MAX],
char type[MNTNAMELEN], char flags[MNTFLAGLEN]);
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static void err(char *prog_name, char *str );
int load_mtab(prog_name)
char *prog_name;
{
/* Read in /etc/mtab and store it in /etc/mtab. */
int fd, n;
char *ptr;
/* Open the file. */
fd = open(etc_mtab, O_RDONLY);
if (fd < 0) {
err(prog_name, ": cannot open ");
return(-1);
}
/* File opened. Read it in. */
n = read(fd, mtab_in, BUF_SIZE);
if (n <= 0) {
/* Read failed. */
err(prog_name, ": cannot read ");
return(-1);
}
if (n == BUF_SIZE) {
/* Some nut has mounted 50 file systems or something like that. */
std_err(prog_name);
std_err(": file too large: ");
std_err(etc_mtab);
return(-1);
}
close(fd);
ptr = mtab_in;
return(0);
}
int get_mtab_entry(char dev[PATH_MAX], char mount_point[PATH_MAX],
char type[MNTNAMELEN], char flags[MNTFLAGLEN])
{
/* Return the next entry from mtab_in. */
int r;
if (iptr >= &mtab_in[BUF_SIZE]) {
dev[0] = '\0';
return(-1);
}
r = sscanf(iptr, "%s on %s type %s (%[^)]s\n",
dev, mount_point, type, flags);
if (r != 4) {
dev[0] = '\0';
return(-1);
}
iptr = strchr(iptr, '\n'); /* Find end of line */
if (iptr != NULL) iptr++; /* Move to next line */
return(0);
}
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static void
err(prog_name, str)
char *prog_name, *str;
{
std_err(prog_name);
std_err(str);
std_err(etc_mtab);
perror(" ");
}