Step 3: PipeCopy

PipeCopy.c

@@ -0,0 +1,57 @@
+#include "cse356header.h"
+
+main(int argc, char *argv[])
+{
+	pid_t forkpid;
+	int fd[2];
+
+	pipe(fd);
+	forkpid = fork();
+
+	if(forkpid == -1) {perror("fork"); exit(1);}
+
+	if(forkpid == 0) { // child process, reads 
+		close(fd[0]); // closes the input side of the pipe
+
+		FILE *src;
+
+		src  = fopen(argv[1], "r");
+
+		if(src == NULL) {
+			printf("Error: Could NOT open file \"%s\".\n", argv[1]);
+			exit(-1);
+		}
+
+		char *buffer[256];
+		while (true) {
+			int read_chars = fread(buffer, sizeof(char), 255, src);
+			if(read_chars <= 0) break;
+			write(fd[1], buffer, read_chars);
+		}
+		fclose(src);
+		exit(0);
+	} else { // parent process, writes
+		close(fd[1]);
+		wait(NULL);
+
+		FILE *dest;
+
+		dest = fopen(argv[2], "w+");
+
+		if(dest == NULL) {
+			printf("Error: Could NOT open file \"%s\".\n", argv[2]);
+			exit(-1);
+		}
+
+		// copying begins
+		char *buffer[256];
+		while (true) {
+			int read_chars = read(fd[0], buffer, sizeof(buffer));
+			if(read_chars <= 0) break;
+			fwrite(buffer, sizeof(char), read_chars, dest);
+		}
+		fclose(dest);
+
+		exit(0);
+	}
+}

makefile

@@ -1,4 +1,4 @@
-all: MyCopy ForkCopy
+all: MyCopy ForkCopy PipeCopy
 clear:
 	rm *.o
 MyCopy: MyCopy.o
@@ -9,3 +9,7 @@ ForkCopy: ForkCopy.o
 	g++ ForkCopy.o -o ForkCopy
 ForkCopy.o:
 	g++ -c ForkCopy.c
+PipeCopy: PipeCopy.o
+	g++ PipeCopy.o -o PipeCopy
+PipeCopy.o:
+	g++ -c PipeCopy.c