cleanup: delete remains of libutil

- exec_t belongs to service.h, the main place where it is used/needed
 - code for executing exec_t is moved to runsvc for the same reason
 - what is left are NORETURN and ARRAY_SIZE
   - the former can be replaced with direct attribute usage since
     the only relevant compilers all support the attribute.
   - the later is only used in 3 places and can be trivially replaced
     with direct usage of sizeof().

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

cmd/Makemodule.am

@@ -7,7 +7,7 @@ runsvc_SOURCES = cmd/runsvc/runsvc.c cmd/runsvc/env.c cmd/runsvc/runsvc.h
 runsvc_CPPFLAGS = $(AM_CPPFLAGS)
 runsvc_CFLAGS = $(AM_CFLAGS)
 runsvc_LDFLAGS = $(AM_LDFLAGS)
-runsvc_LDADD = libinit.a libcfg.a libutil.a
+runsvc_LDADD = libinit.a libcfg.a
 
 killall5_SOURCES = cmd/killall5.c
 killall5_CPPFLAGS = $(AM_CPPFLAGS)
@@ -30,7 +30,7 @@ service_SOURCES += $(SRVHEADERS)
 service_CPPFLAGS = $(AM_CPPFLAGS)
 service_CFLAGS = $(AM_CFLAGS)
 service_LDFLAGS = $(AM_LDFLAGS)
-service_LDADD = libinit.a libcfg.a libutil.a
+service_LDADD = libinit.a libcfg.a
 
 dist_man8_MANS += cmd/shutdown.8 cmd/service/service.8
 

cmd/killall5.c

@@ -9,9 +9,7 @@
 #include <ctype.h>
 #include <errno.h>
 
-#include "util.h"
-
-static NORETURN void usage_and_exit(void)
+static __attribute__((noreturn)) void usage_and_exit(void)
 {
 	fputs("Usage: killall5 SIGNAL\n", stderr);
 	exit(EXIT_FAILURE);

cmd/runsvc/runsvc.c

@@ -1,6 +1,49 @@
 /* SPDX-License-Identifier: ISC */
 #include "runsvc.h"
 
+static int setup_tty(const char *tty, bool truncate)
+{
+	int fd;
+
+	if (tty == NULL)
+		return 0;
+
+	fd = open(tty, O_RDWR);
+	if (fd < 0) {
+		perror(tty);
+		return -1;
+	}
+
+	if (truncate)
+		ftruncate(fd, 0);
+
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+
+	setsid();
+
+	dup2(fd, STDIN_FILENO);
+	dup2(fd, STDOUT_FILENO);
+	dup2(fd, STDERR_FILENO);
+	close(fd);
+	return 0;
+}
+
+static __attribute__((noreturn)) void argv_exec(exec_t *e)
+{
+	char **argv = alloca(sizeof(char *) * (e->argc + 1)), *ptr;
+	int i;
+
+	for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
+		argv[i] = ptr;
+
+	argv[i] = NULL;
+	execvp(argv[0], argv);
+	perror(argv[0]);
+	exit(EXIT_FAILURE);
+}
+
 static int run_sequentially(exec_t *list)
 {
 	pid_t ret, pid;

cmd/runsvc/runsvc.h

@@ -4,6 +4,8 @@
 
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12,7 +14,7 @@
 
 #include "service.h"
 #include "libcfg.h"
-#include "util.h"
+#include "config.h"
 
 #define ENVFILE ETCPATH "/initd.env"
 

cmd/service/servicecmd.c

@@ -5,7 +5,6 @@
 #include "servicecmd.h"
 #include "service.h"
 #include "config.h"
-#include "util.h"
 
 
 command_t *commands;

cmd/service/servicecmd.h

@@ -2,13 +2,14 @@
 #ifndef SERVICECMD_H
 #define SERVICECMD_H
 
+#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <ctype.h>
 
 #include "service.h"
-#include "util.h"
+#include "config.h"
 
 /*
 	Describes a command that can be launched by passing its name as
@@ -45,7 +46,7 @@ service_t *loadsvc(const char *directory, const char *filename, int flags);
 	Implemented in servicecmd.c. Prints program usage message and
 	terminates with the given exit status.
 */
-void usage(int status) NORETURN;
+void usage(int status) __attribute__((noreturn));
 
 /*
 	Write a message to stderr that advises the user how to consult the

cmd/shutdown.c

@@ -10,8 +10,6 @@
 #include <sys/reboot.h>
 #include <linux/reboot.h>
 
-#include "util.h"
-
 #define FL_FORCE 0x01
 #define FL_NOSYNC 0x02
 
@@ -29,7 +27,7 @@ static const char *shortopt = "hprfn";
 static const char *defact_str = "power-off";
 static int defact = RB_POWER_OFF;
 
-static NORETURN void usage(const char *progname, int status)
+static __attribute__((noreturn)) void usage(const char *progname, int status)
 {
 	fprintf(status == EXIT_SUCCESS ? stdout : stderr,
 "%s [OPTIONS...]\n\n"

initd/Makemodule.am

@@ -3,6 +3,6 @@ init_SOURCES += initd/status.c initd/supervisor.c initd/initsock.c
 init_CPPFLAGS = $(AM_CPPFLAGS)
 init_CFLAGS = $(AM_CFLAGS)
 init_LDFLAGS = $(AM_LDFLAGS)
-init_LDADD = libinit.a libcfg.a libutil.a
+init_LDADD = libinit.a libcfg.a
 
 sbin_PROGRAMS += init

initd/init.h

@@ -17,11 +17,12 @@
 #include <linux/reboot.h>
 #include <sys/signalfd.h>
 #include <sys/reboot.h>
+#include <stdbool.h>
 #include <signal.h>
 
 #include "initsock.h"
 #include "service.h"
-#include "util.h"
+#include "config.h"
 
 #define RUNSVCBIN SCRIPTDIR "/runsvc"
 

lib/Makemodule.am

@@ -7,13 +7,9 @@ libinit_a_SOURCES += lib/init/init_socket_recv_status.c
 libinit_a_CPPFLAGS = $(AM_CPPFLAGS)
 libinit_a_CFLAGS = $(AM_CFLAGS)
 
-libutil_a_SOURCES = lib/util/argv_exec.c lib/include/util.h
-libutil_a_CPPFLAGS = $(AM_CPPFLAGS)
-libutil_a_CFLAGS = $(AM_CFLAGS)
-
 libcfg_a_SOURCES = lib/libcfg/rdline.c lib/libcfg/unescape.c lib/libcfg/rdcfg.c
 libcfg_a_SOURCES += lib/libcfg/pack_argv.c lib/include/libcfg.h
 libcfg_a_CPPFLAGS = $(AM_CPPFLAGS)
 libcfg_a_CFLAGS = $(AM_CFLAGS)
 
-noinst_LIBRARIES += libinit.a libcfg.a libutil.a
+noinst_LIBRARIES += libinit.a libcfg.a

lib/include/service.h

@@ -4,7 +4,11 @@
 
 #include <sys/types.h>
 
-#include "util.h"
+typedef struct exec_t {
+	struct exec_t *next;
+	int argc;		/* number of elements in argument vector */
+	char args[];		/* argument vectot string blob */
+} exec_t;
 
 enum {
 	/*

lib/include/util.h

@@ -1,28 +0,0 @@
-/* SPDX-License-Identifier: ISC */
-#ifndef UTIL_H
-#define UTIL_H
-
-#include <sys/types.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdio.h>
-
-#include "config.h"
-
-#ifdef __GNUC__
-	#define NORETURN __attribute__((noreturn))
-#endif
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
-typedef struct exec_t {
-	struct exec_t *next;
-	int argc;		/* number of elements in argument vector */
-	char args[];		/* argument vectot string blob */
-} exec_t;
-
-int setup_tty(const char *tty, bool truncate);
-
-NORETURN void argv_exec(exec_t *e);
-
-#endif /* UTIL_H */

lib/init/rdsvc.c

@@ -11,7 +11,6 @@
 
 #include "service.h"
 #include "libcfg.h"
-#include "util.h"
 
 static int try_unescape(char *arg, rdline_t *rd)
 {
@@ -265,8 +264,10 @@ service_t *rdsvc(int dirfd, const char *filename, int flags)
 	memcpy(svc->name, filename, nlen);
 	svc->id = -1;
 
-	if (rdcfg(svc, &rd, svc_params, ARRAY_SIZE(svc_params), flags))
+	if (rdcfg(svc, &rd, svc_params,
+		  sizeof(svc_params) / sizeof(svc_params[0]), flags)) {
 		goto fail;
+	}
 
 out:
 	rdline_cleanup(&rd);

lib/init/svcmap.c

@@ -23,7 +23,7 @@ int svc_type_from_string(const char *type)
 {
 	size_t i;
 
-	for (i = 0; i < ARRAY_SIZE(type_map); ++i) {
+	for (i = 0; i < sizeof(type_map) / sizeof(type_map[0]); ++i) {
 		if (strcmp(type_map[i], type) == 0)
 			return i;
 	}
@@ -40,7 +40,7 @@ int svc_target_from_string(const char *target)
 {
 	size_t i;
 
-	for (i = 0; i < ARRAY_SIZE(target_map); ++i) {
+	for (i = 0; i < sizeof(target_map) / sizeof(target_map[0]); ++i) {
 		if (strcmp(target_map[i], target) == 0)
 			return i;
 	}

lib/libcfg/rdline.c

@@ -8,7 +8,6 @@
 #include <fcntl.h>
 
 #include "libcfg.h"
-#include "util.h"
 
 int rdline_init(rdline_t *t, int dirfd, const char *filename,
 		int argc, const char *const *argv)

lib/util/argv_exec.c

@@ -1,51 +0,0 @@
-/* SPDX-License-Identifier: ISC */
-#include "service.h"
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <fcntl.h>
-#include <stdio.h>
-
-int setup_tty(const char *tty, bool truncate)
-{
-	int fd;
-
-	if (tty == NULL)
-		return 0;
-
-	fd = open(tty, O_RDWR);
-	if (fd < 0) {
-		perror(tty);
-		return -1;
-	}
-
-	if (truncate)
-		ftruncate(fd, 0);
-
-	close(STDIN_FILENO);
-	close(STDOUT_FILENO);
-	close(STDERR_FILENO);
-
-	setsid();
-
-	dup2(fd, STDIN_FILENO);
-	dup2(fd, STDOUT_FILENO);
-	dup2(fd, STDERR_FILENO);
-	close(fd);
-	return 0;
-}
-
-void argv_exec(exec_t *e)
-{
-	char **argv = alloca(sizeof(char *) * (e->argc + 1)), *ptr;
-	int i;
-
-	for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
-		argv[i] = ptr;
-
-	argv[i] = NULL;
-	execvp(argv[0], argv);
-	perror(argv[0]);
-	exit(EXIT_FAILURE);
-}