Initial commit

1 files changed, 35 insertions, 0 deletions

diff --git a/pipe.c b/pipe.c
new file mode 100644
index 0000000..ae114db
--- /dev/null
+++ b/pipe.c
@@ -0,0 +1,35 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+#define F(cmd) ( (r=cmd),r<0?(perror(#cmd),exit(1),r):r )
+
+int main() {
+	int r;
+	int pA[2];
+	int f = F(open("mehlog", O_CREAT | O_APPEND | O_WRONLY, 0644));
+	pipe(pA);
+	//pipe(pB);
+	if (!F(fork())) {
+		close(f);
+		dup2(pA[1], STDOUT_FILENO);
+		close(pA[0]);
+		close(pA[1]);
+		F(execlp("cat", "cat", NULL));
+	}
+	close(pA[1]);
+	if (!F(fork())) {
+		dup2(f, STDOUT_FILENO);
+		dup2(pA[0], STDIN_FILENO);
+		close(pA[0]);
+		close(f);
+		F(execlp("rev", "rev", NULL));
+	}
+	close(pA[0]);
+	close(f);
+	wait(NULL);
+	return 0;
+}