refactor syscall code
This commit is contained in:
rsc
parent
31085bb416
commit
224f6598c1
11
defs.h
11
defs.h
|
|
@ -16,7 +16,7 @@ struct jmpbuf;
|
|||
void setupsegs(struct proc*);
|
||||
struct proc* copyproc(struct proc*);
|
||||
struct spinlock;
|
||||
uint growproc(int);
|
||||
int growproc(int);
|
||||
void sleep(void*, struct spinlock*);
|
||||
void wakeup(void*);
|
||||
void scheduler(void);
|
||||
|
|
@ -43,10 +43,10 @@ int strncmp(const char*, const char*, uint);
|
|||
// syscall.c
|
||||
void syscall(void);
|
||||
int fetchint(struct proc*, uint, int*);
|
||||
int fetchbyte(struct proc*, uint, char*);
|
||||
int fetcharg(int, void*);
|
||||
int checkstring(uint);
|
||||
int putint(struct proc*, uint, int);
|
||||
int fetchstr(struct proc*, uint, char**);
|
||||
int argint(int, int*);
|
||||
int argptr(int, char**, int);
|
||||
int argstr(int, char**);
|
||||
|
||||
// picirq.c
|
||||
extern ushort irq_mask_8259A;
|
||||
|
|
@ -99,7 +99,6 @@ int pipe_read(struct pipe*, char*, int);
|
|||
// file.c
|
||||
struct stat;
|
||||
void fileinit(void);
|
||||
int fdalloc(void);
|
||||
struct file* filealloc(void);
|
||||
void fileclose(struct file*);
|
||||
int fileread(struct file*, char*, int n);
|
||||
|
|
|
|||
14
file.c
14
file.c
|
|
@ -22,19 +22,7 @@ fileinit(void)
|
|||
initlock(&fd_table_lock, "fd_table");
|
||||
}
|
||||
|
||||
// Allocate a file descriptor number for curproc.
|
||||
int
|
||||
fdalloc(void)
|
||||
{
|
||||
int fd;
|
||||
struct proc *p = curproc[cpu()];
|
||||
for(fd = 0; fd < NOFILE; fd++)
|
||||
if(p->ofile[fd] == 0)
|
||||
return fd;
|
||||
return -1;
|
||||
}
|
||||
|
||||
// Allocate a file descriptor structure
|
||||
// Allocate a file structure
|
||||
struct file*
|
||||
filealloc(void)
|
||||
{
|
||||
|
|
|
|||
77
syscall.c
77
syscall.c
|
|
@ -21,66 +21,73 @@
|
|||
// library system call function. The saved user %esp points
|
||||
// to a saved program counter, and then the first argument.
|
||||
|
||||
// Fetch 32 bits from a user-supplied pointer.
|
||||
// Returns 0 if addr was OK, -1 if illegal.
|
||||
// Fetch the int at addr from process p.
|
||||
int
|
||||
fetchint(struct proc *p, uint addr, int *ip)
|
||||
{
|
||||
*ip = 0;
|
||||
|
||||
if(addr > p->sz - 4)
|
||||
if(addr >= p->sz || addr+4 > p->sz)
|
||||
return -1;
|
||||
*ip = *(int*)(p->mem + addr);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Fetch byte from a user-supplied pointer.
|
||||
// Returns 0 on success, -1 if pointer is illegal.
|
||||
// Fetch the nul-terminated string at addr from process p.
|
||||
// Doesn't actually copy the string - just sets *pp to point at it.
|
||||
// Returns length of string, not including nul.
|
||||
int
|
||||
fetchbyte(struct proc *p, uint addr, char *c)
|
||||
fetchstr(struct proc *p, uint addr, char **pp)
|
||||
{
|
||||
char *cp, *ep;
|
||||
|
||||
if(addr >= p->sz)
|
||||
return -1;
|
||||
*c = *(p->mem + addr);
|
||||
return 0;
|
||||
*pp = p->mem + addr;
|
||||
ep = p->mem + p->sz;
|
||||
for(cp = *pp; cp < ep; cp++)
|
||||
if(*cp == 0)
|
||||
return cp - *pp;
|
||||
return -1;
|
||||
}
|
||||
|
||||
// Fetch the argno'th word-sized system call argument as an integer.
|
||||
int
|
||||
fetcharg(int argno, void *ip)
|
||||
argint(int argno, int *ip)
|
||||
{
|
||||
uint esp;
|
||||
struct proc *p = curproc[cpu()];
|
||||
|
||||
esp = (uint) curproc[cpu()]->tf->esp;
|
||||
return fetchint(curproc[cpu()], esp + 4 + 4*argno, ip);
|
||||
return fetchint(p, p->tf->esp + 4 + 4*argno, ip);
|
||||
}
|
||||
|
||||
// Check that an entire string is valid in user space.
|
||||
// Returns the length, not including null, or -1.
|
||||
// Fetch the nth word-sized system call argument as a pointer
|
||||
// to a block of memory of size n bytes. Check that the pointer
|
||||
// lies within the process address space.
|
||||
int
|
||||
checkstring(uint s)
|
||||
argptr(int argno, char **pp, int size)
|
||||
{
|
||||
char c;
|
||||
int len = 0;
|
||||
|
||||
for(;;){
|
||||
if(fetchbyte(curproc[cpu()], s, &c) < 0)
|
||||
return -1;
|
||||
if(c == '\0')
|
||||
return len;
|
||||
len++;
|
||||
s++;
|
||||
}
|
||||
}
|
||||
|
||||
int
|
||||
putint(struct proc *p, uint addr, int x)
|
||||
{
|
||||
if(addr > p->sz - 4)
|
||||
int i;
|
||||
struct proc *p = curproc[cpu()];
|
||||
|
||||
if(argint(argno, &i) < 0)
|
||||
return -1;
|
||||
memmove(p->mem + addr, &x, 4);
|
||||
if((uint)i >= p->sz || (uint)i+size >= p->sz)
|
||||
return -1;
|
||||
*pp = p->mem + i;
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Fetch the nth word-sized system call argument as a string pointer.
|
||||
// Check that the pointer is valid and the string is nul-terminated.
|
||||
// (There is no shared writable memory, so the string can't change
|
||||
// between this check and being used by the kernel.)
|
||||
int
|
||||
argstr(int argno, char **pp)
|
||||
{
|
||||
int addr;
|
||||
if(argint(argno, &addr) < 0)
|
||||
return -1;
|
||||
return fetchstr(curproc[cpu()], addr, pp);
|
||||
}
|
||||
|
||||
extern int sys_chdir(void);
|
||||
extern int sys_close(void);
|
||||
extern int sys_dup(void);
|
||||
|
|
|
|||
|
|
@ -1,3 +1,4 @@
|
|||
// System call numbers
|
||||
#define SYS_fork 1
|
||||
#define SYS_exit 2
|
||||
#define SYS_wait 3
|
||||
|
|
|
|||
332
sysfile.c
332
sysfile.c
|
|
@ -15,120 +15,117 @@
|
|||
#include "file.h"
|
||||
#include "fcntl.h"
|
||||
|
||||
// Fetch the nth word-sized system call argument as a file descriptor
|
||||
// and return both the descriptor and the corresponding struct file.
|
||||
static int
|
||||
argfd(int argno, int *pfd, struct file **pf)
|
||||
{
|
||||
int fd;
|
||||
struct file *f;
|
||||
struct proc *p = curproc[cpu()];
|
||||
|
||||
if(argint(argno, &fd) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE || (f=p->ofile[fd]) == 0)
|
||||
return -1;
|
||||
if(pfd)
|
||||
*pfd = fd;
|
||||
if(pf)
|
||||
*pf = f;
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Allocate a file descriptor for the given file.
|
||||
// Takes over file reference from caller on success.
|
||||
static int
|
||||
fdalloc(struct file *f)
|
||||
{
|
||||
int fd;
|
||||
struct proc *p = curproc[cpu()];
|
||||
for(fd = 0; fd < NOFILE; fd++){
|
||||
if(p->ofile[fd] == 0){
|
||||
p->ofile[fd] = f;
|
||||
return fd;
|
||||
}
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
int
|
||||
sys_pipe(void)
|
||||
{
|
||||
struct file *rfd = 0, *wfd = 0;
|
||||
int f1 = -1, f2 = -1;
|
||||
int *fd;
|
||||
struct file *rf = 0, *wf = 0;
|
||||
int fd0, fd1;
|
||||
struct proc *p = curproc[cpu()];
|
||||
uint fdp;
|
||||
|
||||
if(pipe_alloc(&rfd, &wfd) < 0)
|
||||
goto oops;
|
||||
if((f1 = fdalloc()) < 0)
|
||||
goto oops;
|
||||
p->ofile[f1] = rfd;
|
||||
if((f2 = fdalloc()) < 0)
|
||||
goto oops;
|
||||
p->ofile[f2] = wfd;
|
||||
if(fetcharg(0, &fdp) < 0)
|
||||
goto oops;
|
||||
if(putint(p, fdp, f1) < 0)
|
||||
goto oops;
|
||||
if(putint(p, fdp+4, f2) < 0)
|
||||
goto oops;
|
||||
if(argptr(0, (void*)&fd, 2*sizeof fd[0]) < 0)
|
||||
return -1;
|
||||
if(pipe_alloc(&rf, &wf) < 0)
|
||||
return -1;
|
||||
fd0 = -1;
|
||||
if((fd0 = fdalloc(rf)) < 0 || (fd1 = fdalloc(wf)) < 0){
|
||||
if(fd0 >= 0)
|
||||
p->ofile[fd0] = 0;
|
||||
fileclose(rf);
|
||||
fileclose(wf);
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
|
||||
oops:
|
||||
if(rfd)
|
||||
fileclose(rfd);
|
||||
if(wfd)
|
||||
fileclose(wfd);
|
||||
if(f1 >= 0)
|
||||
p->ofile[f1] = 0;
|
||||
if(f2 >= 0)
|
||||
p->ofile[f2] = 0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
int
|
||||
sys_write(void)
|
||||
{
|
||||
int fd, n, ret;
|
||||
uint addr;
|
||||
struct proc *p = curproc[cpu()];
|
||||
struct file *f;
|
||||
int n;
|
||||
char *cp;
|
||||
|
||||
if(fetcharg(0, &fd) < 0 ||
|
||||
fetcharg(1, &addr) < 0 ||
|
||||
fetcharg(2, &n) < 0)
|
||||
if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &cp, n) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
return -1;
|
||||
if(p->ofile[fd] == 0)
|
||||
return -1;
|
||||
if(addr + n > p->sz)
|
||||
return -1;
|
||||
|
||||
ret = filewrite(p->ofile[fd], p->mem + addr, n);
|
||||
return ret;
|
||||
return filewrite(f, cp, n);
|
||||
}
|
||||
|
||||
int
|
||||
sys_read(void)
|
||||
{
|
||||
int fd, n, ret;
|
||||
uint addr;
|
||||
struct proc *p = curproc[cpu()];
|
||||
struct file *f;
|
||||
int n;
|
||||
char *cp;
|
||||
|
||||
if(fetcharg(0, &fd) < 0 ||
|
||||
fetcharg(1, &addr) < 0 ||
|
||||
fetcharg(2, &n) < 0)
|
||||
if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &cp, n) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
return -1;
|
||||
if(p->ofile[fd] == 0)
|
||||
return -1;
|
||||
if(addr + n > p->sz)
|
||||
return -1;
|
||||
ret = fileread(p->ofile[fd], p->mem + addr, n);
|
||||
return ret;
|
||||
return fileread(f, cp, n);
|
||||
}
|
||||
|
||||
int
|
||||
sys_close(void)
|
||||
{
|
||||
int fd;
|
||||
struct proc *p = curproc[cpu()];
|
||||
|
||||
if(fetcharg(0, &fd) < 0)
|
||||
struct file *f;
|
||||
|
||||
if(argfd(0, &fd, &f) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
return -1;
|
||||
if(p->ofile[fd] == 0)
|
||||
return -1;
|
||||
fileclose(p->ofile[fd]);
|
||||
p->ofile[fd] = 0;
|
||||
curproc[cpu()]->ofile[fd] = 0;
|
||||
fileclose(f);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
sys_open(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
struct inode *ip, *dp;
|
||||
uint arg0, arg1;
|
||||
int ufd;
|
||||
struct file *fd;
|
||||
int l;
|
||||
char *path;
|
||||
int omode;
|
||||
int fd;
|
||||
struct file *f;
|
||||
char *last;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0)
|
||||
return -1;
|
||||
if((l = checkstring(arg0)) < 0)
|
||||
if(argstr(0, &path) < 0 || argint(1, &omode) < 0)
|
||||
return -1;
|
||||
|
||||
if(arg1 & O_CREATE){
|
||||
dp = namei(cp->mem + arg0, NAMEI_CREATE, 0, &last, &ip);
|
||||
if(omode & O_CREATE){
|
||||
dp = namei(path, NAMEI_CREATE, 0, &last, &ip);
|
||||
if(dp){
|
||||
ip = mknod1(dp, last, T_FILE, 0, 0);
|
||||
iput(dp);
|
||||
|
|
@ -141,86 +138,77 @@ sys_open(void)
|
|||
return -1;
|
||||
}
|
||||
} else {
|
||||
ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
|
||||
ip = namei(path, NAMEI_LOOKUP, 0, 0, 0);
|
||||
if(ip == 0)
|
||||
return -1;
|
||||
}
|
||||
if(ip->type == T_DIR && ((arg1 & O_RDWR) || (arg1 & O_WRONLY))){
|
||||
if(ip->type == T_DIR && ((omode & O_RDWR) || (omode & O_WRONLY))){
|
||||
iput(ip);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if((fd = filealloc()) == 0){
|
||||
if((f = filealloc()) == 0){
|
||||
iput(ip);
|
||||
return -1;
|
||||
}
|
||||
if((ufd = fdalloc()) < 0){
|
||||
if((fd = fdalloc(f)) < 0){
|
||||
iput(ip);
|
||||
fileclose(fd);
|
||||
fileclose(f);
|
||||
return -1;
|
||||
}
|
||||
|
||||
iunlock(ip);
|
||||
fd->type = FD_FILE;
|
||||
if(arg1 & O_RDWR) {
|
||||
fd->readable = 1;
|
||||
fd->writable = 1;
|
||||
} else if(arg1 & O_WRONLY) {
|
||||
fd->readable = 0;
|
||||
fd->writable = 1;
|
||||
f->type = FD_FILE;
|
||||
if(omode & O_RDWR) {
|
||||
f->readable = 1;
|
||||
f->writable = 1;
|
||||
} else if(omode & O_WRONLY) {
|
||||
f->readable = 0;
|
||||
f->writable = 1;
|
||||
} else {
|
||||
fd->readable = 1;
|
||||
fd->writable = 0;
|
||||
f->readable = 1;
|
||||
f->writable = 0;
|
||||
}
|
||||
fd->ip = ip;
|
||||
fd->off = 0;
|
||||
cp->ofile[ufd] = fd;
|
||||
f->ip = ip;
|
||||
f->off = 0;
|
||||
|
||||
return ufd;
|
||||
return fd;
|
||||
}
|
||||
|
||||
int
|
||||
sys_mknod(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
struct inode *nip;
|
||||
uint arg0, arg1, arg2, arg3;
|
||||
int l;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0 || fetcharg(1, &arg1) < 0 ||
|
||||
fetcharg(2, &arg2) < 0 || fetcharg(3, &arg3) < 0)
|
||||
char *path;
|
||||
int len;
|
||||
int type, major, minor;
|
||||
|
||||
if((len=argstr(0, &path)) < 0 || argint(1, &type) < 0 ||
|
||||
argint(2, &major) < 0 || argint(3, &minor) < 0)
|
||||
return -1;
|
||||
|
||||
if((l = checkstring(arg0)) < 0)
|
||||
if(len >= DIRSIZ)
|
||||
return -1;
|
||||
|
||||
if(l >= DIRSIZ)
|
||||
if((nip = mknod(path, type, major, minor)) == 0)
|
||||
return -1;
|
||||
|
||||
nip = mknod(cp->mem + arg0, (short) arg1, (short) arg2, (short) arg3);
|
||||
if(nip)
|
||||
iput(nip);
|
||||
return (nip == 0) ? -1 : 0;
|
||||
iput(nip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
sys_mkdir(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
struct inode *nip;
|
||||
struct inode *dp;
|
||||
uint arg0;
|
||||
int l;
|
||||
char *path;
|
||||
struct dirent de;
|
||||
char *last;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
if(argstr(0, &path) < 0)
|
||||
return -1;
|
||||
|
||||
if((l = checkstring(arg0)) < 0)
|
||||
return -1;
|
||||
|
||||
dp = namei(cp->mem + arg0, NAMEI_CREATE, 0, &last, 0);
|
||||
dp = namei(path, NAMEI_CREATE, 0, &last, 0);
|
||||
if(dp == 0)
|
||||
return -1;
|
||||
|
||||
|
|
@ -248,25 +236,20 @@ sys_mkdir(void)
|
|||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int
|
||||
sys_chdir(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
struct proc *p = curproc[cpu()];
|
||||
struct inode *ip;
|
||||
uint arg0;
|
||||
int l;
|
||||
char *path;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
if(argstr(0, &path) < 0)
|
||||
return -1;
|
||||
|
||||
if((l = checkstring(arg0)) < 0)
|
||||
if((ip = namei(path, NAMEI_LOOKUP, 0, 0, 0)) == 0)
|
||||
return -1;
|
||||
|
||||
if((ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0)) == 0)
|
||||
return -1;
|
||||
|
||||
if(ip == cp->cwd) {
|
||||
if(ip == p->cwd) {
|
||||
iput(ip);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -276,100 +259,74 @@ sys_chdir(void)
|
|||
return -1;
|
||||
}
|
||||
|
||||
idecref(cp->cwd);
|
||||
cp->cwd = ip;
|
||||
iunlock(cp->cwd);
|
||||
idecref(p->cwd);
|
||||
p->cwd = ip;
|
||||
iunlock(p->cwd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
sys_unlink(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint arg0;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
char *path;
|
||||
|
||||
if(argstr(0, &path) < 0)
|
||||
return -1;
|
||||
if(checkstring(arg0) < 0)
|
||||
return -1;
|
||||
r = unlink(cp->mem + arg0);
|
||||
return r;
|
||||
return unlink(path);
|
||||
}
|
||||
|
||||
int
|
||||
sys_fstat(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint fd, addr;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &fd) < 0)
|
||||
struct file *f;
|
||||
struct stat *st;
|
||||
|
||||
if(argfd(0, 0, &f) < 0 || argptr(1, (void*)&st, sizeof *st) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &addr) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
return -1;
|
||||
if(cp->ofile[fd] == 0)
|
||||
return -1;
|
||||
if(addr + sizeof(struct stat) > cp->sz)
|
||||
return -1;
|
||||
r = filestat(cp->ofile[fd], (struct stat*)(cp->mem + addr));
|
||||
return r;
|
||||
return filestat(f, st);
|
||||
}
|
||||
|
||||
int
|
||||
sys_dup(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint fd, ufd1;
|
||||
|
||||
if(fetcharg(0, &fd) < 0)
|
||||
struct file *f;
|
||||
int fd;
|
||||
|
||||
if(argfd(0, 0, &f) < 0)
|
||||
return -1;
|
||||
if(fd < 0 || fd >= NOFILE)
|
||||
if((fd=fdalloc(f)) < 0)
|
||||
return -1;
|
||||
if(cp->ofile[fd] == 0)
|
||||
return -1;
|
||||
if((ufd1 = fdalloc()) < 0)
|
||||
return -1;
|
||||
cp->ofile[ufd1] = cp->ofile[fd];
|
||||
fileincref(cp->ofile[ufd1]);
|
||||
return ufd1;
|
||||
fileincref(f);
|
||||
return fd;
|
||||
}
|
||||
|
||||
int
|
||||
sys_link(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint name1, name2;
|
||||
int r;
|
||||
|
||||
if(fetcharg(0, &name1) < 0 || checkstring(name1) < 0)
|
||||
char *old, *new;
|
||||
|
||||
if(argstr(0, &old) < 0 || argstr(1, &new) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &name2) < 0 || checkstring(name2) < 0)
|
||||
return -1;
|
||||
r = link(cp->mem + name1, cp->mem + name2);
|
||||
return r;
|
||||
return link(old, new);
|
||||
}
|
||||
|
||||
int
|
||||
sys_exec(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
uint arg0, arg1, sz=0, ap, sp, p1, p2;
|
||||
uint sz=0, ap, sp, p1, p2;
|
||||
int i, nargs, argbytes, len;
|
||||
struct inode *ip;
|
||||
struct elfhdr elf;
|
||||
struct proghdr ph;
|
||||
char *mem = 0;
|
||||
char *path, *s;
|
||||
uint argv;
|
||||
|
||||
if(argstr(0, &path) < 0 || argint(1, (int*)&argv) < 0)
|
||||
return -1;
|
||||
|
||||
if(fetcharg(0, &arg0) < 0)
|
||||
return -1;
|
||||
if(fetcharg(1, &arg1) < 0)
|
||||
return -1;
|
||||
if(checkstring(arg0) < 0)
|
||||
return -1;
|
||||
ip = namei(cp->mem + arg0, NAMEI_LOOKUP, 0, 0, 0);
|
||||
ip = namei(path, NAMEI_LOOKUP, 0, 0, 0);
|
||||
if(ip == 0)
|
||||
return -1;
|
||||
|
||||
|
|
@ -399,15 +356,14 @@ sys_exec(void)
|
|||
goto bad;
|
||||
memset(mem, 0, sz);
|
||||
|
||||
// arg1 is a pointer to an array of pointers to string.
|
||||
nargs = 0;
|
||||
argbytes = 0;
|
||||
for(i = 0; ; i++){
|
||||
if(fetchint(cp, arg1 + 4*i, &ap) < 0)
|
||||
for(i = 0;; i++){
|
||||
if(fetchint(cp, argv + 4*i, (int*)&ap) < 0)
|
||||
goto bad;
|
||||
if(ap == 0)
|
||||
break;
|
||||
len = checkstring(ap);
|
||||
len = fetchstr(cp, ap, &s);
|
||||
if(len < 0)
|
||||
goto bad;
|
||||
nargs++;
|
||||
|
|
@ -432,9 +388,9 @@ sys_exec(void)
|
|||
p1 = sp + 12;
|
||||
p2 = sp + 12 + (nargs + 1) * 4;
|
||||
for(i = 0; i < nargs; i++){
|
||||
fetchint(cp, arg1 + 4*i, &ap);
|
||||
len = checkstring(ap);
|
||||
memmove(mem + p2, cp->mem + ap, len + 1);
|
||||
fetchint(cp, argv + 4*i, (int*)&ap);
|
||||
len = fetchstr(cp, ap, &s);
|
||||
memmove(mem + p2, s, len + 1);
|
||||
*(uint*)(mem + p1) = p2;
|
||||
p1 += 4;
|
||||
p2 += len + 1;
|
||||
|
|
|
|||
11
sysproc.c
11
sysproc.c
|
|
@ -44,7 +44,7 @@ sys_kill(void)
|
|||
{
|
||||
int pid;
|
||||
|
||||
if(fetcharg(0, &pid) < 0)
|
||||
if(argint(0, &pid) < 0)
|
||||
return -1;
|
||||
return proc_kill(pid);
|
||||
}
|
||||
|
|
@ -52,20 +52,19 @@ sys_kill(void)
|
|||
int
|
||||
sys_getpid(void)
|
||||
{
|
||||
struct proc *cp = curproc[cpu()];
|
||||
return cp->pid;
|
||||
return curproc[cpu()]->pid;
|
||||
}
|
||||
|
||||
int
|
||||
sys_sbrk(void)
|
||||
{
|
||||
uint addr;
|
||||
int addr;
|
||||
int n;
|
||||
struct proc *cp = curproc[cpu()];
|
||||
|
||||
if(fetcharg(0, &n) < 0)
|
||||
if(argint(0, &n) < 0)
|
||||
return -1;
|
||||
if((addr = growproc(n)) == 0xffffffff)
|
||||
if((addr = growproc(n)) < 0)
|
||||
return -1;
|
||||
setupsegs(cp);
|
||||
return addr;
|
||||
|
|
|
|||
Loading…
Reference in a new issue