sanchayanmaity/xv6-cs450
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Change fetchint, fetcharg, and putint to return -1 on error, 0 on success.

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

10
syscall.c
View file

@ -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