tmprocess.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1999-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#include "sftest.h"
/* Test to see if multiple writers to the same file create
** a consistent set of records.
*/
#ifndef N_PROC
#define N_PROC 3
#endif
#define N_REC 1000
#define B_SIZE 256
#if __STD_C
static ssize_t inspect(Sfio_t* f, const Void_t* buf, size_t n, Sfdisc_t* disc)
#else
static ssize_t inspect(f, buf, n, disc)
Sfio_t* f;
Void_t* buf;
size_t n;
Sfdisc_t* disc;
#endif
{
int w, k;
char* s;
Sfio_t* sf;
if(*((char*)buf + n-1) != '\n')
terror("Not writing a whole record");
sf = sfnew(NIL(Sfio_t*),(Void_t*)buf,n,-1,SF_STRING|SF_READ);
while((s = sfgetr(sf,'\n',0)) )
{ w = sfvalue(sf)-1;
if(s[0] != s[w-1]-1)
terror("Bad record");
k = (s[2]-'0')*10 + (s[3]-'0');
if(k != w)
terror("Expect %d, get %d",k,w);
}
sfclose(sf);
if((w = write(sffileno(f),buf,n)) != (int)n)
terror("Write %d returns %d",n,w);
return w;
}
static Sfdisc_t Disc[N_PROC];
tmain()
{
ssize_t size[N_PROC][N_REC];
int count[N_PROC];
char record[N_PROC][128], *s, *file;
int i, r, n, pid;
Sfio_t* f;
Sfio_t* fa[N_PROC];
char buf[N_PROC][B_SIZE], b[N_PROC][128];
unsigned long u;
/* create pseudo-random record sizes */
u = 1;
for(i = 0; i < N_PROC; ++i)
for(r = 0; r < N_REC; ++r)
{ u = u * 0x63c63cd9L + 0x9c39c33dL;
size[i][r] = (ssize_t)(u%63) + 16;
}
/* records for different processes */
for(i = 0; i < N_PROC; ++i)
for(r = 0; r < 128; ++r)
record[i][r] = '0' + 2*i;
/* create file */
file = tstfile("sf", 0);
if(!(f = sfopen(NIL(Sfio_t*),file,"w+")) )
terror("Opening temporary file %s", file);
/* open file for appending */
for(i = 0; i < N_PROC; ++i)
if(!(fa[i] = sfopen(NIL(Sfio_t*), file, "a")) )
terror("Open %s to append", file);
/* fork processes */
for(i = 0; i < N_PROC; ++i)
{
#ifdef DEBUG
#define FORK() 0
#define RETURN(v)
#else
#define FORK() fork()
#define RETURN(v) texit(v)
#endif
if((pid = (int)FORK()) < 0 )
terror("Creating process %d", i);
else if(pid == 0)
{ /* write to file */
sfsetbuf(fa[i], (Void_t*)buf[i], sizeof(buf[i]));
sfset(fa[i], SF_WHOLE, 1);
Disc[i].writef = inspect;
sfdisc(fa[i], &Disc[i]);
for(r = 0; r < N_REC; ++r)
{ n = size[i][r]; s = b[i];
memcpy(s,record[i],n-1);
s[1] = '(';
s[2] = ((n-1)/10) + '0';
s[3] = ((n-1)%10) + '0';
s[4] = ')';
s[n-2] = s[0] + 1;
s[n-1] = '\n';
if(sfwrite(fa[i],s,n) != n)
terror("sfwrite failed");
}
sfsync(fa[i]);
RETURN(0);
}
}
for(i = 0; i < N_PROC; ++i)
{ wait(&r);
count[i] = 0;
}
n = 0;
while((s = sfgetr(f,'\n',0)) )
{ n += 1;
if((i = s[0] - '0') < 0 || (i%2) != 0 || (i /= 2) >= N_PROC )
terror("%d: Wrong record type", n);
r = sfvalue(f);
if(s[r-2] != s[0]+1)
terror("%d: process%d, number=%d", n, i, count[i]);
for(r -= 3; r > 4; --r)
if(s[r] != s[0])
terror("%d: process%d, count=%d", n, i, count[i]);
if(sfvalue(f) != size[i][count[i]])
terror("%d: process%d number=%d expected size=%d read size=%d",
n, i, count[i], size[i][count[i]], sfvalue(f));
count[i] += 1;
}
for(i = 0; i < N_PROC; ++i)
if(count[i] != N_REC)
terror("Bad count%d %d", i, count[i]);
texit(0);
}