execve and forks ok

Makefile

@@ -0,0 +1,66 @@
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
+#               . name = value \          . += append to a variable   #
+#   VARIABLES   .        value            . != set result of command  #
+#               . name is case sensitive  . ?= set if not already set #
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
+
+NAME      = microshell
+
+CC        = gcc
+EXT       = c
+
+CFLAGS    = -Wall -Wextra -Werror $(INCLUDES)
+
+VPATH     = $(D_SRCS)
+
+LIBS      =
+
+INCLUDES  = -I$(D_HEADERS)
+
+D_SRCS    = .
+SRCS      = microshell.c
+
+D_HEADERS = .
+HEADERS   =
+
+D_OBJS    = builds
+OBJS      = $(SRCS:%.$(EXT)=$(D_OBJS)/%.o)
+
+RM_OBJS   = rm -rf $(D_OBJS)
+
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
+#             .   target: prerequisites   .   $@ : target             #
+#    RULES    .           recipe          .   $< : 1st prerequisite   #
+#             .           recipe          .   $^ : all prerequisites  #
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #
+
+all: $(NAME)
+
+$(D_OBJS)/%.o: %.$(EXT) | $(D_OBJS)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(D_OBJS):
+	mkdir $@
+
+$(OBJS): $(HEADERS:%=$(D_HEADERS)/%)
+
+$(NAME): $(OBJS)
+	$(CC) $(OBJS) -o $@ $(LIBS)
+
+leaks: $(NAME)
+	valgrind --leak-check=full --show-leak-kinds=all ./$(NAME)
+
+test: $(NAME)
+	./microshell /bin/ls "|" /usr/bin/grep microshell ";" /bin/echo i love my microshell
+
+clean:
+	$(RM_OBJS)
+
+fclean: clean
+	rm -f $(NAME)
+
+re: fclean all
+
+.PHONY : all clean fclean re
+

microshell.c

@@ -1,14 +1,20 @@
-#include <unistd.h>	// write
+#include <unistd.h>		// write, fork, execve, pipe
-#include <stdio.h>	// printf
+#include <stdio.h>		// printf
-#include <string.h>	// strcmp
+#include <string.h>		// strcmp
+#include <sys/types.h>	// pid_t
+#include <sys/wait.h>	// waitpid
 
-void	print_cmd(char **av, int end)
+#define STDIN	0
+#define STDOUT	1
+#define STDERR	2
+
+void	print_cmd(char **av)
 {
 	int i;
 	int size;
 
 	i = 0;
-	while (i < end)
+	while (av[i])
 	{
 		size = 0;
 		while (av[i][size] != '\0')
@@ -20,7 +26,23 @@ void	print_cmd(char **av, int end)
 	write(1, "\n", 1);
 }
 
-int	main(int ac, char **av)
+//void	exec_cmd(char **av, int end, char **en)
+void	exec_cmd(char **av, char **en)
+{
+	pid_t	pid = fork();
+
+//	av[end] = NULL;
+	if (pid == 0)	// child process
+	{
+		execve(av[0], av, en);
+	}
+	else			// parent process
+	{
+		waitpid(pid, NULL, 0);
+	}
+}
+
+int	main(int ac, char **av, char **en)
 {
 	int i;
 	int start;
@@ -33,9 +55,13 @@ int	main(int ac, char **av)
 		start = i;
 		while (i < ac && strcmp(av[i], "|") && strcmp(av[i], ";"))
 			i++;
-		print_cmd(&av[start], i - start);
+		av[i] = NULL;
+//		print_cmd(&av[start]);
+		exec_cmd(&av[start], en);
 		if (i < ac)
 			i++;
 	}
 	return (0);
 }
+
+// https://www.rozmichelle.com/pipes-forks-dups/