Select test-set imported from the minix contributions, with permission

to modify and distribute from Jose Manuel Gomez, the author
(jmgomez@linuxmail.org).

test/select/test02.c

@@ -0,0 +1,112 @@
+/*
+ * Test name: test02.c
+ *
+ * Objetive: The purpose of this test is to make sure that select works
+ * when working with files.
+ *
+ * Description: This tests first creates six dummy files with different
+ * modes and performs select calls on them evaluating the input and resulting
+ * bitmaps. 
+ *
+ * Jose M. Gomez
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+void dump_fdset(fd_set *set) {
+	int i;
+	for (i = 0; i < OPEN_MAX; i++)  
+	if (FD_ISSET(i, set))
+		printf(" %d->1 ", i);
+	else 
+		printf(" %d->0  ", i);
+	printf("\n");
+}
+
+void main(void) {
+	int fd1, fd2, fd3, fd4, fd5, fd6;	/* file descriptors of files */
+	fd_set fds_read, fds_write;
+	int retval;
+
+	/* Creates the dummy files with different modes */
+	fd1 = open("dummy1.txt", O_CREAT | O_RDONLY);
+	if (fd1 < 0) {
+		perror("Error opening file"); 
+		exit(-1);
+	}
+	
+	fd2 = open("dummy2.txt", O_CREAT | O_RDONLY);
+	if (fd2 < 0) {
+		perror("Error opening file");
+		exit(-1);
+	}
+
+	fd3 = open("dummy3.txt", O_CREAT | O_WRONLY);
+	if (fd3 < 0) {
+		perror("Error opening file");
+		exit(-1);
+	}
+
+	fd4 = open("dummy4.txt", O_CREAT | O_WRONLY);
+	if (fd4 < 0) {
+		perror("Error opening file");
+		exit(-1);
+	}
+
+	fd5 = open("dummy5.txt", O_CREAT | O_RDWR);
+	if (fd5 < 0) {
+		perror("Error opening file");
+		exit(-1);
+	}
+
+	fd6 = open("dummy6.txt", O_CREAT | O_RDWR);
+	if (fd6 < 0) {
+		perror("Error opening file");
+		exit(-1);
+	}
+
+	/* Create the fd_set structures */
+	FD_ZERO(&fds_read);
+	FD_ZERO(&fds_write);
+	FD_SET(fd1, &fds_read);		/* fd1 => O_RDONLY */
+	FD_SET(fd2, &fds_read);		/* fd2 => O_RDONLY */
+	FD_SET(fd3, &fds_write);	/* fd3 => O_WRONLY */
+	FD_SET(fd4, &fds_write);	/* fd4 => O_WRONLY */
+	FD_SET(fd5, &fds_read);		/* fd5 => O_RDWR */
+	FD_SET(fd5, &fds_write);	/* fd5 => O_RDWR */
+	FD_SET(fd6, &fds_read);		/* fd6 => O_RDWR */
+	FD_SET(fd6, &fds_write);	/* fd6 => O_RDWR */
+
+	printf("* Dump INPUT fds_read:\n"); 
+	dump_fdset(&fds_read);
+	printf("* Dump INPUT fds_write:\n");
+	dump_fdset(&fds_write);
+
+	retval=select(9, &fds_read, &fds_write, NULL, NULL); 
+	printf("\n***********************\n");
+	printf("After select: \n");
+	printf("Return value: %d\n", retval);
+	printf("* Dump RESULTING fds_read:\n");
+	dump_fdset(&fds_read);
+	printf("* Dump RESULTING fds_write:\n");
+	dump_fdset(&fds_write);	
+	/* close and delete dummy files */
+	close(fd1);
+	close(fd2);
+	close(fd3);
+	close(fd4);
+	close(fd5);
+	close(fd6);
+	unlink("dummy1.txt");
+	unlink("dummy2.txt");
+	unlink("dummy3.txt");
+	unlink("dummy4.txt");
+	unlink("dummy5.txt");
+	unlink("dummy6.txt");
+}