UNIX: Probleme de pipe (2): le source ne passe pas entierement

int fds[2];

...

int f= open("arch.cpio", O_RDONLY);
pid_t p;

pipe(fds);

p= fork();

if( p > 0 )
{
char buf[1024];
int n;

while( (n= read(f, buf, 1024)) > 0 )
write(fds1[1], buf, n);

close(f);
close(fds1[1]);
}
else
{
dup2(fds[0], 0);

execl(...);
}
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