211ff0c67e
don't hold fd table lock across idecref() (latter does block i/o) idecref calls iput() in case last ref -> freeing inode dir size is 512 * # blocks, so readi/writei &c work unlink deletes dirent even if ip->nlink > 0
424 lines
7.3 KiB
C
424 lines
7.3 KiB
C
#include "user.h"
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#include "fcntl.h"
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char buf[2048];
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// simple fork and pipe read/write
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void
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pipe1(void)
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{
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int fds[2], pid;
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int seq = 0, i, n, cc, total;
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pipe(fds);
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pid = fork();
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if(pid == 0){
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close(fds[0]);
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for(n = 0; n < 5; n++){
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for(i = 0; i < 1033; i++)
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buf[i] = seq++;
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if(write(fds[1], buf, 1033) != 1033){
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printf(1, "pipe1 oops 1\n");
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exit();
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}
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}
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exit();
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} else {
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close(fds[1]);
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total = 0;
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cc = 1;
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while((n = read(fds[0], buf, cc)) > 0){
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for(i = 0; i < n; i++){
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if((buf[i] & 0xff) != (seq++ & 0xff)){
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printf(1, "pipe1 oops 2\n");
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return;
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}
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}
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total += n;
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cc = cc * 2;
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if(cc > sizeof(buf))
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cc = sizeof(buf);
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}
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if(total != 5 * 1033)
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printf(1, "pipe1 oops 3\n");
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close(fds[0]);
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wait();
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}
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puts("pipe1 ok\n");
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}
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// meant to be run w/ at most two CPUs
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void
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preempt(void)
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{
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int pid1, pid2, pid3;
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int pfds[2];
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pid1 = fork();
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if(pid1 == 0)
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for(;;)
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;
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pid2 = fork();
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if(pid2 == 0)
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for(;;)
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;
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pipe(pfds);
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pid3 = fork();
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if(pid3 == 0){
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close(pfds[0]);
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if(write(pfds[1], "x", 1) != 1)
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printf(1, "preempt write error");
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close(pfds[1]);
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for(;;)
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;
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}
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close(pfds[1]);
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if(read(pfds[0], buf, sizeof(buf)) != 1){
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printf(1, "preempt read error");
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return;
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}
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close(pfds[0]);
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kill(pid1);
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kill(pid2);
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kill(pid3);
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wait();
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wait();
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wait();
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puts("preempt ok\n");
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}
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// try to find any races between exit and wait
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void
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exitwait(void)
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{
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int i, pid;
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for(i = 0; i < 100; i++){
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pid = fork();
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if(pid < 0){
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printf(1, "fork failed\n");
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return;
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}
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if(pid){
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if(wait() != pid){
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printf(1, "wait wrong pid\n");
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return;
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}
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} else {
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exit();
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}
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}
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puts("exitwait ok\n");
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}
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// two processes write to the same file descriptor
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// is the offset shared? does inode locking work?
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void
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sharedfd()
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{
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int fd, pid, i, n, nc, np;
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char buf[10];
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unlink("sharedfd");
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fd = open("sharedfd", O_CREATE|O_RDWR);
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if(fd < 0){
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printf(1, "usertests: cannot open sharedfd for writing");
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return;
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}
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pid = fork();
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memset(buf, pid==0?'c':'p', sizeof(buf));
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for(i = 0; i < 100; i++){
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if(write(fd, buf, sizeof(buf)) != sizeof(buf)){
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printf(1, "usertests: write sharedfd failed\n");
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break;
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}
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}
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if(pid == 0)
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exit();
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else
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wait();
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close(fd);
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fd = open("sharedfd", 0);
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if(fd < 0){
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printf(1, "usertests: cannot open sharedfd for reading\n");
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return;
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}
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nc = np = 0;
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while((n = read(fd, buf, sizeof(buf))) > 0){
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for(i = 0; i < sizeof(buf); i++){
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if(buf[i] == 'c')
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nc++;
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if(buf[i] == 'p')
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np++;
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}
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}
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close(fd);
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unlink("sharedfd");
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if(nc == 1000 && np == 1000)
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printf(1, "sharedfd ok\n");
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else
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printf(1, "sharedfd oops %d %d\n", nc, np);
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}
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// two processes write two different files at the same
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// time, to test block allocation.
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void
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twofiles()
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{
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int fd, pid, i, j, n, total;
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char *fname;
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unlink("f1");
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unlink("f2");
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pid = fork();
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if(pid < 0){
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puts("fork failed\n");
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return;
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}
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fname = pid ? "f1" : "f2";
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fd = open(fname, O_CREATE | O_RDWR);
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if(fd < 0){
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puts("create failed\n");
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exit();
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}
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memset(buf, pid?'p':'c', 512);
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for(i = 0; i < 12; i++){
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if((n = write(fd, buf, 500)) != 500){
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printf(1, "write failed %d\n", n);
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exit();
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}
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}
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close(fd);
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if(pid)
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wait();
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else
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exit();
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for(i = 0; i < 2; i++){
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fd = open(i?"f1":"f2", 0);
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total = 0;
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while((n = read(fd, buf, sizeof(buf))) > 0){
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for(j = 0; j < n; j++){
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if(buf[j] != (i?'p':'c')){
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puts("wrong char\n");
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exit();
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}
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}
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total += n;
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}
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close(fd);
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if(total != 12*500){
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printf(1, "wrong length %d\n", total);
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exit();
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}
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}
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unlink("f1");
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unlink("f2");
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puts("twofiles ok\n");
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}
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// two processes create and delete files in same directory
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void
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createdelete()
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{
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int pid, i, fd;
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int n = 20;
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char name[32];
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pid = fork();
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if(pid < 0){
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puts("fork failed\n");
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exit();
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}
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name[0] = pid ? 'p' : 'c';
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name[2] = '\0';
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for(i = 0; i < n; i++){
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name[1] = '0' + i;
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fd = open(name, O_CREATE | O_RDWR);
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if(fd < 0){
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puts("create failed\n");
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exit();
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}
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close(fd);
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if(i > 0 && (i % 2 ) == 0){
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name[1] = '0' + (i / 2);
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if(unlink(name) < 0){
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puts("unlink failed\n");
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exit();
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}
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}
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}
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if(pid)
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wait();
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else
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exit();
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for(i = 0; i < n; i++){
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name[0] = 'p';
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name[1] = '0' + i;
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fd = open(name, 0);
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if((i == 0 || i >= n/2) && fd < 0){
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printf(1, "oops createdelete %s didn't exist\n", name);
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} else if((i >= 1 && i < n/2) && fd >= 0){
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printf(1, "oops createdelete %s did exist\n", name);
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}
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if(fd >= 0)
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close(fd);
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name[0] = 'c';
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name[1] = '0' + i;
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fd = open(name, 0);
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if((i == 0 || i >= n/2) && fd < 0){
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printf(1, "oops createdelete %s didn't exist\n", name);
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} else if((i >= 1 && i < n/2) && fd >= 0){
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printf(1, "oops createdelete %s did exist\n", name);
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}
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if(fd >= 0)
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close(fd);
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}
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for(i = 0; i < n; i++){
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name[0] = 'p';
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name[1] = '0' + i;
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unlink(name);
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name[0] = 'c';
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unlink(name);
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}
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printf(1, "createdelete ok\n");
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}
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// can I unlink a file and still read it?
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void
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unlinkread()
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{
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int fd, fd1;
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fd = open("unlinkread", O_CREATE | O_RDWR);
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if(fd < 0){
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puts("create unlinkread failed\n");
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exit();
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}
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write(fd, "hello", 5);
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close(fd);
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fd = open("unlinkread", O_RDWR);
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if(fd < 0){
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puts("open unlinkread failed\n");
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exit();
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}
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if(unlink("unlinkread") != 0){
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puts("unlink unlinkread failed\n");
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exit();
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}
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fd1 = open("xxx", O_CREATE | O_RDWR);
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write(fd1, "yyy", 3);
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close(fd1);
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if(read(fd, buf, sizeof(buf)) != 5){
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puts("unlinkread read failed");
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exit();
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}
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if(buf[0] != 'h'){
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puts("unlinkread wrong data\n");
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exit();
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}
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if(write(fd, buf, 10) != 10){
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puts("unlinkread write failed\n");
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exit();
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}
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close(fd);
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unlink("xxx");
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puts("unlinkread ok\n");
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}
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void
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linktest()
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{
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int fd;
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unlink("lf1");
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unlink("lf2");
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fd = open("lf1", O_CREATE|O_RDWR);
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if(fd < 0){
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puts("create lf1 failed\n");
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exit();
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}
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if(write(fd, "hello", 5) != 5){
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puts("write lf1 failed\n");
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exit();
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}
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close(fd);
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if(link("lf1", "lf2") < 0){
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puts("link lf1 lf2 failed\n");
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exit();
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}
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unlink("lf1");
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if(open("lf1", 0) >= 0){
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puts("unlinked lf1 but it is still there!\n");
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exit();
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}
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fd = open("lf2", 0);
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if(fd < 0){
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puts("open lf2 failed\n");
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exit();
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}
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if(read(fd, buf, sizeof(buf)) != 5){
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puts("read lf2 failed\n");
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exit();
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}
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close(fd);
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if(link("lf2", "lf2") >= 0){
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puts("link lf2 lf2 succeeded! oops\n");
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exit();
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}
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unlink("lf2");
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if(link("lf2", "lf1") >= 0){
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puts("link non-existant succeeded! oops\n");
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exit();
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}
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if(link(".", "lf1") >= 0){
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puts("link . lf1 succeeded! oops\n");
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exit();
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}
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puts("linktest ok\n");
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}
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int
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main(int argc, char *argv[])
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{
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puts("usertests starting\n");
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linktest();
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unlinkread();
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createdelete();
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twofiles();
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sharedfd();
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pipe1();
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preempt();
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exitwait();
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puts("usertests finished\n");
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exit();
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}
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