Add hostname(1).
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1
Makefile
1
Makefile
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@ -15,6 +15,7 @@ disked \
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editor \
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editor \
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ext \
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ext \
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games \
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games \
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hostname \
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init \
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init \
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kblayout \
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kblayout \
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kblayout-compiler \
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kblayout-compiler \
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@ -0,0 +1 @@
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hostname
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@ -0,0 +1,28 @@
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include ../build-aux/platform.mak
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include ../build-aux/compiler.mak
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include ../build-aux/version.mak
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include ../build-aux/dirs.mak
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OPTLEVEL?=$(DEFAULT_OPTLEVEL)
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CFLAGS?=$(OPTLEVEL)
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CFLAGS += -Wall -Wextra
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BINARIES = hostname
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MANPAGES1 = hostname.1
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all: $(BINARIES)
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.PHONY: all install clean
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install: all
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mkdir -p $(DESTDIR)$(BINDIR)
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install $(BINARIES) $(DESTDIR)$(BINDIR)
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mkdir -p $(DESTDIR)$(MANDIR)/man1
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install $(MANPAGES1) $(DESTDIR)$(MANDIR)/man1
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%: %.c
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$(CC) -std=gnu11 $(CFLAGS) $(CPPFLAGS) $< -o $@
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clean:
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rm -f $(BINARIES)
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@ -0,0 +1,28 @@
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.Dd March 19, 2017
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.Dt HOSTNAME 1
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.Os
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.Sh NAME
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.Nm hostname
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.Nd write or set system hostname
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.Sh SYNOPSIS
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.Nm hostname
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.Op Fl s
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.Op Ar hostname
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.Sh DESCRIPTION
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.Nm
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writes the system hostname, or sets the system hostname to
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.Ar hostname
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if specified.
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.Pp
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The options are as follows:
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.Bl -tag -width "12345678"
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.It Fl s , Fl \-short
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Write the hostname up to but not including the first period.
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.El
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.Sh EXIT STATUS
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.Nm
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will exit 0 on success and non-zero otherwise.
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.Sh SEE ALSO
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.Xr gethostname 2 ,
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.Xr sethostname 2 ,
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.Xr hostname 5
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@ -0,0 +1,104 @@
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/*
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* Copyright (c) 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* hostname.c
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* Write or set the system hostname.
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*/
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#include <err.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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// TODO: The Sortix <limits.h> doesn't expose this at the moment.
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#if !defined(HOST_NAME_MAX) && defined(__sortix__)
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#include <sortix/limits.h>
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#endif
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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int main(int argc, char* argv[])
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{
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bool short_hostname = false;
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 's': short_hostname = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--short") )
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short_hostname = true;
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( 3 <= argc )
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errx(1, "unexpected extra operand");
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if ( argc == 2 )
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{
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if ( short_hostname )
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errx(1, "the -s option is incompatible with setting hostname");
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char* hostname = argv[1];
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if ( sethostname(hostname, strlen(hostname)) < 0 )
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err(1, "sethostname: %s", hostname);
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return 0;
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}
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char hostname[HOST_NAME_MAX + 1];
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if ( gethostname(hostname, sizeof(hostname)) < 0 )
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err(1, "gethostname");
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if ( short_hostname )
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hostname[strcspn(hostname, ".")] = '\0';
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puts(hostname);
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if ( ferror(stdout) || fflush(stdout) == EOF )
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err(1, "stdout");
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return 0;
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}
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@ -26,5 +26,7 @@ System hostname.
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dragon
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dragon
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.Ed
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.Ed
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr hostname 1 ,
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.Xr gethostname 2 ,
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.Xr sethostname 2 ,
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.Xr sethostname 2 ,
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.Xr init 8
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.Xr init 8
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