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>

2 files changed, 46 insertions, 1 deletions

diff --git a/cmd/runsvc/runsvc.c b/cmd/runsvc/runsvc.c
index 794aa29..75fdc46 100644
--- a/cmd/runsvc/runsvc.c
+++ b/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;
diff --git a/cmd/runsvc/runsvc.h b/cmd/runsvc/runsvc.h
index 9f1a946..2a6ae49 100644
--- a/cmd/runsvc/runsvc.h
+++ b/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"