1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * NAME
20 * fork07.c
21 *
22 * DESCRIPTION
23 * Check that all children inherit parent's file descriptor
24 *
25 * ALGORITHM
26 * Parent opens a file, writes to it; forks Nforks children.
27 * Each child attempts to read the file then returns.
28 * Parent reports PASS if all children succeed.
29 *
30 * USAGE
31 * fork07
32 *
33 * HISTORY
34 * 07/2001 Ported by Wayne Boyer
35 * 07/2002 Limited forking and split "infinite forks" test case to
36 * fork12.c by Nate Straz
37 *
38 * RESTRICTIONS
39 * None
40 */
41
42 #include <stdio.h>
43 #include <errno.h>
44 #include <string.h>
45 #include <sys/wait.h>
46 #include <sys/types.h>
47 #include <sys/stat.h>
48 #include "test.h"
49
50 char *TCID = "fork07";
51 int TST_TOTAL = 1;
52
53 static void help(void);
54 static void setup(void);
55 static void cleanup(void);
56
57 static char pbuf[10];
58 static char fnamebuf[40];
59
60 static char *Nforkarg;
61 static int Nflag;
62 static int Nforks;
63 static int vflag;
64
65 static option_t options[] = {
66 {"N:", &Nflag, &Nforkarg},
67 {"v", &vflag, NULL},
68 {NULL, NULL, NULL}
69 };
70
main(int ac,char ** av)71 int main(int ac, char **av)
72 {
73 int status, forks, pid1;
74 int ch_r_stat;
75 FILE *rea, *writ;
76 int c_pass, c_fail;
77
78 int lc;
79
80 rea = NULL;
81 writ = NULL;
82
83 tst_parse_opts(ac, av, options, &help);
84
85 if (Nflag) {
86 if (sscanf(Nforkarg, "%i", &Nforks) != 1)
87 tst_brkm(TBROK, cleanup,
88 "--N option arg is not a number");
89 } else
90 Nforks = 100;
91
92 setup();
93
94 for (lc = 0; TEST_LOOPING(lc); lc++) {
95 tst_count = 0;
96
97 writ = fopen(fnamebuf, "w");
98 if (writ == NULL)
99 tst_resm(TFAIL | TERRNO, "fopen(.. \"w\") failed");
100 rea = fopen(fnamebuf, "r");
101 if (rea == NULL)
102 tst_resm(TFAIL | TERRNO, "fopen(.. \"r\") failed");
103
104 fprintf(writ, "abcdefghijklmnopqrstuv");
105 fflush(writ);
106 sleep(1);
107
108 if ((getc(rea)) != 'a')
109 tst_resm(TFAIL, "getc from read side was confused");
110
111 /* fork off the children */
112 tst_resm(TINFO, "Forking %d children", Nforks);
113 tst_old_flush();
114 for (forks = 0; forks < Nforks; forks++) {
115 pid1 = fork();
116 if (pid1 == 0) {
117 ch_r_stat = getc(rea);
118 #ifdef DEBUG
119 tst_resm(TINFO, "Child got char: %c",
120 ch_r_stat);
121 tst_resm(TINFO,
122 "integer value of getc in child "
123 "expected %d got %d", 'b', ch_r_stat);
124 #endif
125 if (ch_r_stat == 'b') {
126 if (vflag) {
127 tst_resm(TINFO,
128 "%6d: read correct character",
129 getpid());
130 }
131 exit(0);
132 } else {
133 if (vflag) {
134 tst_resm(TINFO,
135 "%6d: read '%c' instead of 'b'",
136 getpid(),
137 (char)ch_r_stat);
138 }
139 exit(1);
140 }
141 } else if (pid1 == -1)
142 tst_brkm(TBROK | TERRNO, cleanup,
143 "fork failed");
144 }
145 tst_resm(TINFO, "Forked all %d children, now collecting",
146 Nforks);
147
148 /* Collect all the kids and see how they did */
149
150 c_pass = c_fail = 0;
151 while (wait(&status) > 0) {
152 if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
153 c_pass++;
154 else
155 c_fail++;
156 --forks;
157 }
158 if (forks == 0) {
159 tst_resm(TINFO, "Collected all %d children", Nforks);
160 if (c_fail > 0)
161 tst_resm(TFAIL,
162 "%d/%d children didn't read correctly from an inheritted fd",
163 c_fail, Nforks);
164 else
165 tst_resm(TPASS,
166 "%d/%d children read correctly from an inheritted fd",
167 c_pass, Nforks);
168 } else if (forks > 0)
169 tst_brkm(TBROK, cleanup,
170 "There should be %d more children to collect!",
171 forks);
172 else
173
174 tst_brkm(TBROK, cleanup,
175 "Collected %d more children then I should have!",
176 abs(forks));
177 }
178 fclose(writ);
179 fclose(rea);
180 cleanup();
181
182 tst_exit();
183 }
184
help(void)185 static void help(void)
186 {
187 printf(" -N n Create n children each iteration\n");
188 printf(" -v Verbose mode\n");
189 }
190
setup(void)191 static void setup(void)
192 {
193 tst_sig(FORK, DEF_HANDLER, cleanup);
194 umask(0);
195 TEST_PAUSE;
196 tst_tmpdir();
197
198 strcpy(fnamebuf, "fork07.");
199 sprintf(pbuf, "%d", getpid());
200 strcat(fnamebuf, pbuf);
201 }
202
cleanup(void)203 static void cleanup(void)
204 {
205 int waitstatus;
206
207 /* collect our zombies */
208 while (wait(&waitstatus) > 0) ;
209
210 unlink(fnamebuf);
211 tst_rmdir();
212 }
213