C version in progress

FossilOrigin-Name: c143b7b33eed96b1183129105594fb8e74d1e0cb

3 files changed, 155 insertions, 7 deletions

diff --git a/Makefile b/Makefile
index 405060a..994b9c1 100644
--- a/Makefile
+++ b/Makefile
@@ -30,9 +30,11 @@ SRCS		:= ${SRCS:S/^/${SRCS_DIR}/g}
 
 OBJS		:= ${SRCS:=.o}
 
+INCS		:= ${SRCS:.c=.h}
+
 NAME		:= bsdsetsid
 
-CFLAGS		+= -std=c89
+CFLAGS		 = -std=c89
 CFLAGS		+= -Wall
 CFLAGS		+= -Wextra
 CFLAGS		+= -Werror
@@ -44,7 +46,7 @@ MKDIR		:= mkdir -p
 
 .OBJDIR: ./
 .SUFFIXES: .c.o .c
-.c.c.o:
+.c.c.o: ${INCS}
 	${CC} -c ${CFLAGS} -o ${.TARGET:S/src/obj/} ${.IMPSRC}
 
 ${OBJS_DIR}:
diff --git a/src/c_bsdsetsid.c b/src/c_bsdsetsid.c
index 28099f3..2452553 100644
--- a/src/c_bsdsetsid.c
+++ b/src/c_bsdsetsid.c
@@ -39,20 +39,105 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * bsdsetsid: src/c_bsdsetsid.c
- * Wed Nov 25 22:16:26 CET 2020
+ * Wed Nov 25 22:31:26 CET 2020
  * Joe
  *
  * This is the entrypoint of the program.
  */
 
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "c_bsdsetsid.h"
+
+static char
+c_args
+(int			argc,
+ const char*	argv[],
+ const char*	envp[],
+ bool_t*		wopt)
+{
+	(void)envp;
+	if (argc == 1) {
+		dprintf(
+			STDERR_FILENO,
+			"%s: %s\n",
+			C_PROGNAME,
+			C_ERR_NOARG
+			);
+		return (1);
+	}
+	if (strncmp(argv[1], C_W_OPT, 3) == 0) {
+		*wopt = TRUE;
+		if (argc == 2) {
+			dprintf(
+				STDERR_FILENO,
+				"%s: %s\n",
+				C_PROGNAME,
+				C_ERR_NOARG
+				);
+			return (1);
+		}
+	}
+	return (0);
+}
+
 int
 main
 (int			argc,
  const char*	argv[],
  const char*	envp[])
 {
-	(void)argc;
-	(void)argv;
-	(void)envp;
-	return (0);
+	int sets_ret;
+	int exec_ret;
+	pid_t pid;
+	bool_t wopt;
+
+	wopt = FALSE;
+	if (c_args(argc, argv, envp, &wopt) != 0) {
+		return (EXIT_FAILURE);
+	}
+	pid = fork();
+	if (pid == -1) {
+		dprintf(
+			STDERR_FILENO,
+			"%s: fork: %s\n",
+			C_PROGNAME,
+			strerror(errno)
+			);
+		return (EXIT_FAILURE);
+	}
+	else if (pid == 0) {
+		sets_ret = setsid();
+		if (sets_ret == -1) {
+			dprintf(
+				STDERR_FILENO,
+				"%s: setsid: %s\n",
+				C_PROGNAME,
+				strerror(errno)
+				);
+			return (EXIT_FAILURE);
+		}
+		exec_ret = execve(
+			argv[1 + wopt],
+			(char* const*)argv + (1 + wopt),
+			(char* const*)envp
+			);
+		if (exec_ret == -1) {
+			dprintf(
+				STDERR_FILENO,
+				"%s: execve: %s\n",
+				C_PROGNAME,
+				strerror(errno)
+				);
+			return (EXIT_FAILURE);
+		}
+	}
+	else {
+		return (EXIT_SUCCESS);
+	}
+	return (EXIT_SUCCESS);
 }
diff --git a/src/c_bsdsetsid.h b/src/c_bsdsetsid.h
new file mode 100644
index 0000000..59469f2
--- /dev/null
+++ b/src/c_bsdsetsid.h
@@ -0,0 +1,61 @@
+/*
+ * ========================
+ * =====    ===============
+ * ======  ================
+ * ======  ================
+ * ======  ====   ====   ==
+ * ======  ===     ==  =  =
+ * ======  ===  =  ==     =
+ * =  ===  ===  =  ==  ====
+ * =  ===  ===  =  ==  =  =
+ * ==     =====   ====   ==
+ * ========================
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2020 Joe
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the organization nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOE ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL JOE BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * bsdsetsid: src/c_bsdsetsid.h
+Wed Nov 25 22:46:14 CET 2020
+ * Joe
+ *
+ * This is the entrypoint of the program.
+ */
+#ifndef __C_BSDSETSID_H__
+#define __C_BSDSETSID_H__
+
+typedef char bool_t;
+
+enum bool_e {
+	FALSE,
+	TRUE
+};
+
+#define C_PROGNAME "bsdsetsid"
+#define C_ERR_NOARG "no program specified"
+#define C_W_OPT "-w"
+
+#endif