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Document unmount(1).

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This commit is contained in:
Daniel Roskams 2016-10-11 15:38:50 +08:00
parent b5240163b6
commit 27677f2f9a
3 changed files with 42 additions and 34 deletions
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5
utils/Makefile
View file

@ -84,6 +84,7 @@ chroot \
unmount \
MANPAGES8=\
unmount.8 \
all: $(BINARIES) $(SBINS)
@ -97,8 +98,8 @@ install: all
install $(SBINS) $(DESTDIR)$(SBINDIR)
mkdir -p $(DESTDIR)$(MANDIR)/man1
cp $(MANPAGES1) $(DESTDIR)$(MANDIR)/man1
#mkdir -p $(DESTDIR)$(MANDIR)/man8
#cp $(MANPAGES8) $(DESTDIR)$(MANDIR)/man8
mkdir -p $(DESTDIR)$(MANDIR)/man8
cp $(MANPAGES8) $(DESTDIR)$(MANDIR)/man8
%: %.c
$(CC) -std=gnu11 $(CFLAGS) $(CPPFLAGS) $< -o $@

35
utils/unmount.8 Normal file
View file

@ -0,0 +1,35 @@
.Dd October 11, 2016
.Dt UNMOUNT 8
.Os
.Sh NAME
.Nm unmount
.Nd unmount filesystems
.Sh SYNOPSIS
.Nm
.Op Fl fl
.Ar directory ...
.Sh DESCRIPTION
.Nm
unmounts the specified paths. The mountpoint is removed so that it cannot be
opened further, and
.Nm
waits until no files on the filesystem are open, after which the filesystem is
shut off cleanly.
.Pp
The options are as follows:
.Bl -tag -width "12345678"
.It Fl f, Fl \-force
Shut off the filesystem immediately, further operations to any open files will
fail. The filesystem will be consistent, but processes may be stopped in the
middle of file operations.
.It Fl l, Fl \-lazy
Do not wait for the filesystem to be unused, and shut off the filesystem in
the background. It is not safe to shut down the computer directly after using
this option.
.El
.Sh EXIT STATUS
.Nm
will exit 0 on success and non-zero otherwise.
.Sh SEE ALSO
.Xr unmount 2 ,
.Xr extfs 8

36
utils/unmount.c
View file

@ -19,8 +19,7 @@
#include <sys/mount.h>
#include <errno.h>
#include <error.h>
#include <err.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
@ -40,22 +39,6 @@ static void compact_arguments(int* argc, char*** argv)
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... DIRECTORY...\n", argv0);
fprintf(fp, "Unmounts filesystems mounted at directories..\n");
fprintf(fp, "\n");
fprintf(fp, "Mandatory arguments to long options are mandatory for short options too.\n");
fprintf(fp, " -f, --force unmount even though still in use\n");
fprintf(fp, " -l, --lazy remove mountpoint but delay unmounting until no longer used");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
@ -63,7 +46,6 @@ int main(int argc, char* argv[])
bool force = false;
bool lazy = false;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
@ -80,25 +62,15 @@ int main(int argc, char* argv[])
case 'f': force = true; break;
case 'l': lazy = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
errx(1, "unknown option -- '%c'", c);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--force") )
force = true;
else if ( !strcmp(arg, "--lazy") )
lazy = true;
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
errx(1, "unknown option: %s", arg);
}
compact_arguments(&argc, &argv);
@ -113,7 +85,7 @@ int main(int argc, char* argv[])
{
const char* path = argv[i];
if ( unmount(path, flags) < 0 )
error(1, errno, "`%s'", path);
err(1, "%s", path);
}
return 0;