sanchayanmaity/xv6-cs450
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Change fetchint, fetcharg, and putint to return -1 on error, 0 on success.

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They had been returning 0 on error, 1 on success, but all the callers
were checking for return value < 0.
This commit is contained in:
rsc 2006-07-15 17:13:56 +00:00
parent 46bbd72f3e
commit 7f419a0d29
1 changed files with 5 additions and 5 deletions
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10
syscall.c
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@ -23,7 +23,7 @@ extern struct spinlock proc_table_lock;
/* /*
* fetch 32 bits from a user-supplied pointer. * 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 int
fetchint(struct proc *p, unsigned addr, int *ip) fetchint(struct proc *p, unsigned addr, int *ip)
@ -31,9 +31,9 @@ fetchint(struct proc *p, unsigned addr, int *ip)
*ip = 0; *ip = 0;
if(addr > p->sz - 4) if(addr > p->sz - 4)
return 0; return -1;
memcpy(ip, p->mem + addr, 4); memcpy(ip, p->mem + addr, 4);
return 1; return 0;
} }
int int
@ -49,9 +49,9 @@ int
putint(struct proc *p, unsigned addr, int ip) putint(struct proc *p, unsigned addr, int ip)
{ {
if(addr > p->sz - 4) if(addr > p->sz - 4)
return 0; return -1;
memcpy(p->mem + addr, &ip, 4); memcpy(p->mem + addr, &ip, 4);
return 1; return 0;
} }
int int