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/*-------------------------------------------------------------------------
*
* tstsem.c
* Test of System V Semaphore Emulation
*
* Copyright (c) 1999, repas AEG Automation GmbH
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/port/qnx4/Attic/tstsem.c,v 1.2 2000/03/14 18:12:06 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "postgres.h"
#include "storage/ipc.h"
#include <sys/mman.h>
#include <sys/sem.h>
#define SEMMAX 16
#define OPSMAX 1
static int semid;
static void sig_handler( int sig_no )
{
union semun arg;
int i = semctl( semid, 0, GETNCNT, arg );
if( i == -1 ) perror( "semctl" );
else printf( "semval = %d\n", i );
}
int main( int argc, char **argv )
{
int c, errflg = 0;
char s[80];
key_t key = IPC_PRIVATE;
int nsems = SEMMAX;
int semflg = 0;
int unlink = 0;
int i;
struct sembuf sops[OPSMAX];
u_short array[SEMMAX];
union semun arg;
optarg = NULL;
while( !errflg && ( c = getopt( argc, argv, "k:n:cxu" ) ) != -1 ) {
switch( c ) {
case 'k': key = atoi( optarg ); break;
case 'n': nsems = atoi( optarg ); break;
case 'c': semflg |= IPC_CREAT; break;
case 'x': semflg |= IPC_EXCL; break;
case 'u': unlink = 1; break;
default: errflg++;
}
}
if( errflg ) {
printf( "usage: tstsem [-k key] [-n nsems] [-cxu]\n" );
exit( 1 );
}
if( unlink ) {
i = shm_unlink( "SysV_Sem_Info" );
if( i == -1 ) perror( "shm_unlink" );
exit( i );
}
semid = semget( key, nsems, semflg );
if( semid == -1 ) {
perror( "semget" );
exit( semid );
}
/* test signal interrupts */
signal( SIGTERM, sig_handler );
do {
printf( "(-)sem_op, (+)sem_op, (G)ETVAL, (S)ETVAL, GET(P)ID, GET(A)LL, SETA(L)L, GET(N)CNT, GET(Z)CNT, e(x)it: " );
scanf( "%s", s );
switch( s[0] ) {
case '-':
case '+':
sops[0].sem_num = 0;
sops[0].sem_op = atoi( s );
if( sops[0].sem_op == 0 ) sops[0].sem_op = s[0] == '+' ? +1 : -1;
sops[0].sem_flg = 0;
if( semop( semid, sops, 1 ) == -1 ) perror( "semop" );
break;
case 'G':
case 'g':
i = semctl( semid, 0, GETVAL, arg );
if( i == -1 ) perror( "semctl" );
else printf( "semval = %d\n", i );
break;
case 'S':
case 's':
printf( "semval = " );
scanf( "%d", &arg.val );
if( semctl( semid, 0, SETVAL, arg ) == -1 ) perror( "semctl" );
break;
case 'P':
case 'p':
i = semctl( semid, 0, GETPID, arg );
if( i == -1 ) perror( "semctl" );
else printf( "PID = %d\n", i );
break;
case 'A':
case 'a':
arg.array = array;
i = semctl( semid, 0, GETALL, arg );
if( i == -1 ) perror( "semctl" );
else {
for( i = 0; i < nsems; i++ ) {
printf( "semval[%d] = %hu\n", i, arg.array[i] );
}
}
break;
case 'L':
case 'l':
arg.array = array;
for( i = 0; i < nsems; i++ ) {
printf( "semval[%d] = ", i );
scanf( "%hu", &arg.array[i] );
}
if( semctl( semid, 0, SETALL, arg ) == -1 )perror( "semctl" );
break;
case 'N':
case 'n':
i = semctl( semid, 0, GETNCNT, arg );
if( i == -1 ) perror( "semctl" );
else printf( "semval = %d\n", i );
break;
case 'Z':
case 'z':
i = semctl( semid, 0, GETZCNT, arg );
if( i == -1 ) perror( "semctl" );
else printf( "semval = %d\n", i );
break;
}
}
while( s[0] != 'x' );
if( semctl( semid, 0, IPC_RMID, arg ) == -1 ) {
perror( "semctl" );
exit( -1 );
}
exit( 0 );
}
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