test for pwrite() (Contributed by Buccapatnam Tirumala, Gautam)

test/Makefile

@@ -11,7 +11,8 @@ OBJ=	test1  test2  test3  test4  test5  test6  test7  test8  test9  \
 	       test21 test22 test23        test25 test26 test27 test28 test29 \
 	test30 test31 test32        test34 test35 test36 test37 test38 \
 	test39 t10a t11a t11b test40 t40a t40b t40c t40d t40e t40f test41 \
-	test42 test44 test45 test47 test48 test49 test50 test51 test52 test53
+	test42 test44 test45 test47 test48 test49 test50 test51 test52 test53 \
+	test54
 
 BIGOBJ=  test20 test24
 ROOTOBJ= test11 test33 test43 test46
@@ -108,3 +109,4 @@ test51: test51.c
 test51-gcc: test51.c
 test52: test52.c
 test52-gcc: test52.c
+test54: test54.c

test/test54.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <err.h>
+#include <stdlib.h>
+
+int main(void)
+{
+	int fd;
+	char *wbuf, *rbuf;
+	off_t off=0;
+	size_t size;
+	ssize_t nwritten;
+	ssize_t nread;
+	char *filename;
+	int i;
+
+	printf("Test 54 ");
+	fflush(stdout);
+
+	if((filename = mktemp("/tmp/pwrite_test_XXXXXXX")) == NULL) {
+		err(1, "Failed to create tempfile");
+	}
+
+	if((fd = open(filename, O_CREAT|O_RDWR)) < 0) {
+		err(1, "Failed to open %s", filename);
+	}
+
+	size = 1 + rand() % 4096;
+	off = rand();
+
+	if((wbuf = malloc(sizeof(char)*size)) == NULL) {
+		errx(1, "Malloc failed.\n");
+	}
+
+	for(i = 0; i < size; i++) {
+		wbuf[i] = 1 + rand()%127;
+	}
+	
+	if((nwritten = pwrite(fd, wbuf, size, off)) < 0) {
+		err(1, "pwrite failed");
+	}
+
+	if((rbuf = malloc(sizeof(char)*nwritten)) == NULL) {
+		errx(1, "Malloc failed.\n");
+	}
+
+	if((nread = pread(fd, rbuf, nwritten, off)) < 0) {
+		err(1, "pread failed");
+	}
+
+	if(strncmp(rbuf, wbuf, nread) != 0) {
+		err(1, "Test failed.\n");
+	}
+
+	printf(" ok\n");
+
+	close(fd);
+	free(wbuf);
+
+	return 0;
+}