diff options
| -rw-r--r-- | syscall.c | 10 |
1 files changed, 5 insertions, 5 deletions
@@ -23,7 +23,7 @@ extern struct spinlock proc_table_lock; /* * fetch 32 bits from a user-supplied pointer. - * returns 1 if addr was OK, 0 if illegal. + * returns 0 if addr was OK, -1 if illegal. */ int fetchint(struct proc *p, unsigned addr, int *ip) @@ -31,9 +31,9 @@ fetchint(struct proc *p, unsigned addr, int *ip) *ip = 0; if(addr > p->sz - 4) - return 0; + return -1; memcpy(ip, p->mem + addr, 4); - return 1; + return 0; } int @@ -49,9 +49,9 @@ int putint(struct proc *p, unsigned addr, int ip) { if(addr > p->sz - 4) - return 0; + return -1; memcpy(p->mem + addr, &ip, 4); - return 1; + return 0; } int |