199 lines
4.1 KiB
C
199 lines
4.1 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* NAME
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* fork07.c
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*
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* DESCRIPTION
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* Check that all children inherit parent's file descriptor
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*
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* ALGORITHM
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* Parent opens a file, writes to it; forks processes until
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* -1 is returned. Each child attempts to read the file then returns.
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*
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* USAGE
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* fork07
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS
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* None
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*/
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#include <stdio.h>
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#include "test.h"
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#include "usctest.h"
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char *TCID = "fork07";
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int TST_TOTAL = 1;
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extern int Tst_count;
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void setup(void);
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void cleanup(void);
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char pbuf[10];
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char fnamebuf[40];
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main(int ac, char **av)
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{
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int status, count, forks, pid1;
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int ch_r_stat;
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FILE *rea, *writ;
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int lc; /* loop counter */
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const char *msg; /* message returned from parse_opts */
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/*
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* parse standard options
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*/
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if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
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tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
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/*NOTREACHED*/
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}
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/*
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* perform global setup for the test
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*/
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setup();
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/*
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* check looping state if -i option is given
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*/
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/*
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* reset Tst_count in case we are looping.
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*/
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Tst_count = 0;
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if ((writ = fopen(fnamebuf, "w")) == NULL)
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tst_resm(TFAIL, "failed to fopen file for write");
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if ((rea = fopen(fnamebuf, "r")) == NULL)
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tst_resm(TFAIL, "failed to fopen file for read");
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fprintf(writ,"abcdefghijklmnopqrstuv") ;
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fflush(writ);
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sleep(1);
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if ((getc(rea)) != 'a')
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tst_resm(TFAIL, "getc from read side was confused");
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forks = 0;
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forkone:
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++forks;
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pid1 = -1;
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if ( forks >= 1000 || (pid1 = fork()) != 0) { /* parent */
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if (pid1 > 0) {
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goto forkone;
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} else if (pid1 < 0) {
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tst_resm(TINFO, "last child forked");
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}
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} else { /* child */
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ch_r_stat = getc(rea);
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#ifdef DEBUG
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tst_resm(TINFO, "Child got char: %c", ch_r_stat);
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tst_resm(TINFO, "integer value of getc in child "
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"expected %d got %d", 'b', ch_r_stat);
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#endif
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if (ch_r_stat != EOF) { /* for error or EOF */
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tst_resm(TPASS, "test passed in child no %d",
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forks);
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exit(0);
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} else {
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tst_resm(TFAIL, "Test failed in child no. %d",
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forks);
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exit(-1);
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}
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}
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/* parent */
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--forks;
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for (count = 0; count <= forks; count++) {
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wait(&status);
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#ifdef DEBUG
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tst_resm(TINFO, " exit status of wait "
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" expected 0 got %d", status);
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#endif
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if (status == 0) {
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tst_resm(TPASS, "parent test passed");
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} else {
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tst_resm(TFAIL, "parent test failed");
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}
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}
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tst_resm(TINFO, "Number of processes forked is %d", forks);
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}
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fclose (writ);
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fclose (rea);
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cleanup();
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/*NOTREACHED*/
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}
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/*
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* setup() - performs all ONE TIME setup for this test
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*/
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void
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setup()
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{
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/*
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* capture signals
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*/
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tst_sig(FORK, DEF_HANDLER, cleanup);
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umask(0);
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/*
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* Pause if that option was specified
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*/
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TEST_PAUSE;
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/*
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* make a temp directory and cd to it
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*/
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tst_tmpdir();
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strcpy(fnamebuf, "fork07.");
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sprintf(pbuf, "%d", getpid());
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strcat(fnamebuf, pbuf);
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit
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*/
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void
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cleanup()
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{
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/*
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* print timing stats if that option was specified.
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* print errno log if that option was specified.
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*/
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TEST_CLEANUP;
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/*
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* remove tmp dir and all files in it
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*/
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unlink(fnamebuf);
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tst_rmdir();
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tst_exit();
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}
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