170010018
/
minix3
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
minix3/tests/test38.c

733 lines
20 KiB
C
Raw Permalink Blame History

/* Many of the tests require 1.6.n, n > 16, so we may as well assume that
* POSIX signals are implemented.
*/
#define SIGACTION
/* test38: read(), write() Author: Jan-Mark Wams (jms@cs.vu.nl) */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include <time.h>
#include <signal.h>
#include <stdio.h>
int max_error = 4;
#include "common.h"
#define ITERATIONS 3
#define BUF_SIZE 1024
#define System(cmd) if (system(cmd) != 0) printf("``%s'' failed\n", cmd)
#define Chdir(dir) if (chdir(dir) != 0) printf("Can't goto %s\n", dir)
#define Stat(a,b) if (stat(a,b) != 0) printf("Can't stat %s\n", a)
int superuser;
int signumber = 0;
void test38a(void);
void test38b(void);
void test38c(void);
void setsignumber(int _signumber);
int main(int argc, char *argv[])
{
int i, m = 0xFFFF;
sync();
start(38);
if (argc == 2) m = atoi(argv[1]);
superuser = (geteuid() == 0);
umask(0000);
for (i = 0; i < ITERATIONS; i++) {
if (m & 0001) test38a();
if (m & 0002) test38b();
if (m & 0004) test38c();
}
quit();
return(-1); /* Unreachable */
}
void test38a()
{ /* Try normal operation. */
int fd1;
struct stat st1, st2;
time_t time1;
char buf[BUF_SIZE];
int stat_loc;
int i, j;
int tube[2];
subtest = 1;
System("rm -rf ../DIR_38/*");
/* Let's open bar. */
if ((fd1 = open("bar", O_RDWR | O_CREAT, 0777)) != 3) e(1);
Stat("bar", &st1);
/* Writing nothing should not affect the file at all. */
if (write(fd1, "", 0) != 0) e(2);
Stat("bar", &st2);
if (st1.st_uid != st2.st_uid) e(3);
if (st1.st_gid != st2.st_gid) e(4); /* should be same */
if (st1.st_mode != st2.st_mode) e(5);
if (st1.st_size != st2.st_size) e(6);
if (st1.st_nlink != st2.st_nlink) e(7);
if (st1.st_mtime != st2.st_mtime) e(8);
if (st1.st_ctime != st2.st_ctime) e(9);
if (st1.st_atime != st2.st_atime) e(10);
/* A write should update some status fields. */
time(&time1);
while (time1 >= time((time_t *)0))
;
if (write(fd1, "foo", 4) != 4) e(11);
Stat("bar", &st2);
if (st1.st_mode != st2.st_mode) e(12);
if (st1.st_size >= st2.st_size) e(13);
if ((off_t) 4 != st2.st_size) e(14);
if (st1.st_nlink != st2.st_nlink) e(15);
if (st1.st_mtime >= st2.st_mtime) e(16);
if (st1.st_ctime >= st2.st_ctime) e(17);
if (st1.st_atime != st2.st_atime) e(18);
/* Lseeks should not change the file status. */
if (lseek(fd1, (off_t) - 2, SEEK_END) != 2) e(19);
Stat("bar", &st1);
if (st1.st_mode != st2.st_mode) e(20);
if (st1.st_size != st2.st_size) e(21);
if (st1.st_nlink != st2.st_nlink) e(22);
if (st1.st_mtime != st2.st_mtime) e(23);
if (st1.st_ctime != st2.st_ctime) e(24);
if (st1.st_atime != st2.st_atime) e(25);
/* Writing should start at the current (2) position. */
if (write(fd1, "foo", 4) != 4) e(26);
Stat("bar", &st2);
if (st1.st_mode != st2.st_mode) e(27);
if (st1.st_size >= st2.st_size) e(28);
if ((off_t) 6 != st2.st_size) e(29);
if (st1.st_nlink != st2.st_nlink) e(30);
if (st1.st_mtime > st2.st_mtime) e(31);
if (st1.st_ctime > st2.st_ctime) e(32);
if (st1.st_atime != st2.st_atime) e(33);
/* A read of zero bytes should not affect anything. */
if (read(fd1, buf, 0) != 0) e(34);
Stat("bar", &st1);
if (st1.st_uid != st2.st_uid) e(35);
if (st1.st_gid != st2.st_gid) e(36); /* should be same */
if (st1.st_mode != st2.st_mode) e(37);
if (st1.st_size != st2.st_size) e(38);
if (st1.st_nlink != st2.st_nlink) e(39);
if (st1.st_mtime != st2.st_mtime) e(40);
if (st1.st_ctime != st2.st_ctime) e(41);
if (st1.st_atime != st2.st_atime) e(42);
/* The file now should contain ``fofoo\0'' Let's check that. */
if (lseek(fd1, (off_t) 0, SEEK_SET) != 0) e(43);
if (read(fd1, buf, BUF_SIZE) != 6) e(44);
if (strcmp(buf, "fofoo") != 0) e(45);
/* Only the Access Time should be updated. */
Stat("bar", &st2);
if (st1.st_mtime != st2.st_mtime) e(46);
if (st1.st_ctime != st2.st_ctime) e(47);
if (st1.st_atime >= st2.st_atime) e(48);
/* A read of zero bytes should do nothing even at the end of the file. */
time(&time1);
while (time1 >= time((time_t *)0))
;
if (read(fd1, buf, 0) != 0) e(49);
Stat("bar", &st1);
if (st1.st_size != st2.st_size) e(50);
if (st1.st_mtime != st2.st_mtime) e(51);
if (st1.st_ctime != st2.st_ctime) e(52);
if (st1.st_atime != st2.st_atime) e(53);
/* Reading should be done from the current offset. */
if (read(fd1, buf, BUF_SIZE) != 0) e(54);
if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(55);
if (read(fd1, buf, BUF_SIZE) != 4) e(56);
if (strcmp(buf, "foo") != 0) e(57);
/* Reading should effect the current file position. */
if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(58);
if (read(fd1, buf, 1) != 1) e(59);
if (*buf != 'f') e(60);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 3) e(61);
if (read(fd1, buf, 1) != 1) e(62);
if (*buf != 'o') e(63);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 4) e(64);
if (read(fd1, buf, 1) != 1) e(65);
if (*buf != 'o') e(66);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 5) e(67);
if (read(fd1, buf, 1) != 1) e(68);
if (*buf != '\0') e(69);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(70);
/* Read's at EOF should return 0. */
if (read(fd1, buf, BUF_SIZE) != 0) e(71);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(72);
if (read(fd1, buf, BUF_SIZE) != 0) e(73);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(74);
if (read(fd1, buf, BUF_SIZE) != 0) e(75);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(76);
if (read(fd1, buf, BUF_SIZE) != 0) e(77);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(78);
if (read(fd1, buf, BUF_SIZE) != 0) e(79);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(80);
/* Writing should not always change the file size. */
if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(81);
if (write(fd1, "ba", 2) != 2) e(82);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 4) e(83);
Stat("bar", &st1);
if (st1.st_size != 6) e(84);
/* Kill the \0 at the end. */
if (lseek(fd1, (off_t) 5, SEEK_SET) != 5) e(85);
if (write(fd1, "x", 1) != 1) e(86);
/* And close the bar. */
if (close(fd1) != 0) e(87);
/* Try some stuff with O_APPEND. Bar contains ``fobaox'' */
if ((fd1 = open("bar", O_RDWR | O_APPEND)) != 3) e(88);
/* No matter what the file position is. Writes should append. */
if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(89);
if (write(fd1, "y", 1) != 1) e(90);
Stat("bar", &st1);
if (st1.st_size != (off_t) 7) e(91);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 7) e(92);
if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(93);
if (write(fd1, "z", 2) != 2) e(94);
/* The file should contain ``fobaoxyz\0'' == 9 chars long. */
Stat("bar", &st1);
if (st1.st_size != (off_t) 9) e(95);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 9) e(96);
/* Reading on a O_APPEND flag should be from the current offset. */
if (lseek(fd1, (off_t) 0, SEEK_SET) != 0) e(97);
if (read(fd1, buf, BUF_SIZE) != 9) e(98);
if (strcmp(buf, "fobaoxyz") != 0) e(99);
if (lseek(fd1, (off_t) 0, SEEK_CUR) != 9) e(100);
if (close(fd1) != 0) e(101);
/* Let's test fifo writes. First blocking. */
if (mkfifo("fifo", 0777) != 0) e(102);
/* Read from fifo but no writer. */
System("rm -rf /tmp/sema.38a");
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd1 = open("fifo", O_RDONLY)) != 3) e(103);
system("> /tmp/sema.38a");
system("while test -f /tmp/sema.38a; do sleep 1; done");
errno =0;
if (read(fd1, buf, BUF_SIZE) != 0) e(104);
if (read(fd1, buf, BUF_SIZE) != 0) e(105);
if (read(fd1, buf, BUF_SIZE) != 0) e(106);
if (close(fd1) != 0) e(107);
exit(0);
default:
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(108);
while (stat("/tmp/sema.38a", &st1) != 0) sleep(1);
if (close(fd1) != 0) e(109);
unlink("/tmp/sema.38a");
if (wait(&stat_loc) == -1) e(110);
if (stat_loc != 0) e(111); /* Alarm? */
}
/* Read from fifo should wait for writer. */
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd1 = open("fifo", O_RDONLY)) != 3) e(112);
if (read(fd1, buf, BUF_SIZE) != 10) e(113);
if (strcmp(buf, "Hi reader") != 0) e(114);
if (close(fd1) != 0) e(115);
exit(0);
default:
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(116);
sleep(1);
if (write(fd1, "Hi reader", 10) != 10) e(117);
if (close(fd1) != 0) e(118);
if (wait(&stat_loc) == -1) e(119);
if (stat_loc != 0) e(120); /* Alarm? */
}
#if DEAD_CODE
/* Does this test test what it is supposed to test??? */
/* Read from fifo should wait for all writers to close. */
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(60);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(121);
printf("C2 did open\n");
if (close(fd1) != 0) e(122);
printf("C2 did close\n");
exit(0);
default:
printf("C1 scheduled\n");
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(123);
printf("C1 did open\n");
sleep(2);
if (close(fd1) != 0) e(124);
printf("C1 did close\n");
sleep(1);
if (wait(&stat_loc) == -1) e(125);
if (stat_loc != 0) e(126); /* Alarm? */
}
exit(stat_loc);
default: {
int wait_status;
printf("Parent running\n");
sleep(1); /* open in childs first */
if ((fd1 = open("fifo", O_RDONLY)) != 3) e(127);
if (read(fd1, buf, BUF_SIZE) != 0) e(128);
if (close(fd1) != 0) e(129);
printf("Parent closed\n");
if ((wait_status=wait(&stat_loc)) == -1) e(130);
printf("wait_status %d, stat_loc %d:", wait_status, stat_loc);
if (WIFSIGNALED(stat_loc)) {
printf(" killed, signal number %d\n", WTERMSIG(stat_loc));
}
else if (WIFEXITED(stat_loc)) {
printf(" normal exit, status %d\n", WEXITSTATUS(stat_loc));
}
if (stat_loc != 0) e(131); /* Alarm? */
}
}
#endif
/* PIPE_BUF has to have a nice value. */
if (PIPE_BUF < 5) e(132);
if (BUF_SIZE < 1000) e(133);
/* Writes of blocks smaller than PIPE_BUF should be atomic. */
System("rm -rf /tmp/sema.38b;> /tmp/sema.38b");
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(134);
for (i = 0; i < 100; i++) write(fd1, "1234 ", 5);
system("while test -f /tmp/sema.38b; do sleep 1; done");
if (close(fd1) != 0) e(135);
exit(0);
default:
if ((fd1 = open("fifo", O_WRONLY)) != 3) e(136);
for (i = 0; i < 100; i++) write(fd1, "1234 ", 5);
while (stat("/tmp/sema.38b", &st1) == 0) sleep(1);
if (close(fd1) != 0) e(137);
if (wait(&stat_loc) == -1) e(138);
if (stat_loc != 0) e(139); /* Alarm? */
}
exit(stat_loc);
default:
if ((fd1 = open("fifo", O_RDONLY)) != 3) e(140);
i = 0;
memset(buf, '\0', BUF_SIZE);
/* Read buffer full or till EOF. */
do {
j = read(fd1, buf + i, BUF_SIZE - i);
if (j > 0) {
if (j % 5 != 0) e(141);
i += j;
}
} while (j > 0 && i < 1000);
/* Signal the children to close write ends. This should not be */
/* Necessary. But due to a bug in 1.16.6 this is necessary. */
unlink("/tmp/sema.38b");
if (j < 0) e(142);
if (i != 1000) e(143);
if (wait(&stat_loc) == -1) e(144);
if (stat_loc != 0) e(145); /* Alarm? */
/* Check 200 times 1234. */
for (i = 0; i < 200; i++)
if (strncmp(buf + (i * 5), "1234 ", 5) != 0) break;
if (i != 200) e(146);
if (buf[1000] != '\0') e(147);
if (buf[1005] != '\0') e(148);
if (buf[1010] != '\0') e(149);
if (read(fd1, buf, BUF_SIZE) != 0) e(150);
if (close(fd1) != 0) e(151);
}
/* Read from pipe should wait for writer. */
if (pipe(tube) != 0) e(152);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if (close(tube[1]) != 0) e(153);
if (read(tube[0], buf, BUF_SIZE) != 10) e(154);
if (strcmp(buf, "Hi reader") != 0) e(155);
if (close(tube[0]) != 0) e(156);
exit(0);
default:
if (close(tube[0]) != 0) e(157);
sleep(1);
if (write(tube[1], "Hi reader", 10) != 10) e(158);
if (close(tube[1]) != 0) e(159);
if (wait(&stat_loc) == -1) e(160);
if (stat_loc != 0) e(161); /* Alarm? */
}
/* Read from pipe should wait for all writers to close. */
if (pipe(tube) != 0) e(162);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if (close(tube[0]) != 0) e(163);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if (close(tube[1]) != 0) e(164);
exit(0);
default:
sleep(1);
if (close(tube[1]) != 0) e(165);
if (wait(&stat_loc) == -1) e(166);
if (stat_loc != 0) e(167); /* Alarm? */
}
exit(stat_loc);
default:
if (close(tube[1]) != 0) e(168);
if (read(tube[0], buf, BUF_SIZE) != 0) e(169);
if (close(tube[0]) != 0) e(170);
if (wait(&stat_loc) == -1) e(171);
if (stat_loc != 0) e(172); /* Alarm? */
}
/* Writes of blocks smaller than PIPE_BUF should be atomic. */
System("rm -rf /tmp/sema.38c;> /tmp/sema.38c");
if (pipe(tube) != 0) e(173);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if (close(tube[0]) != 0) e(174);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
for (i = 0; i < 100; i++) write(tube[1], "1234 ", 5);
system("while test -f /tmp/sema.38c; do sleep 1; done");
if (close(tube[1]) != 0) e(175);
exit(0);
default:
for (i = 0; i < 100; i++) write(tube[1], "1234 ", 5);
while (stat("/tmp/sema.38c", &st1) == 0) sleep(1);
if (close(tube[1]) != 0) e(176);
if (wait(&stat_loc) == -1) e(177);
if (stat_loc != 0) e(178); /* Alarm? */
}
exit(stat_loc);
default:
i = 0;
if (close(tube[1]) != 0) e(179);
memset(buf, '\0', BUF_SIZE);
do {
j = read(tube[0], buf + i, BUF_SIZE - i);
if (j > 0) {
if (j % 5 != 0) e(180);
i += j;
} else
break; /* EOF seen. */
} while (i < 1000);
unlink("/tmp/sema.38c");
if (j < 0) e(181);
if (i != 1000) e(182);
if (close(tube[0]) != 0) e(183);
if (wait(&stat_loc) == -1) e(184);
if (stat_loc != 0) e(185); /* Alarm? */
/* Check 200 times 1234. */
for (i = 0; i < 200; i++)
if (strncmp(buf + (i * 5), "1234 ", 5) != 0) break;
if (i != 200) e(186);
}
}
void test38b()
{
int i, fd, stat_loc;
char buf[BUF_SIZE];
char buf2[BUF_SIZE];
struct stat st;
subtest = 2;
System("rm -rf ../DIR_38/*");
/* Lets try sequential writes. */
system("rm -rf /tmp/sema.38d");
System("> testing");
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(1);
if (write(fd, "one ", 4) != 4) e(2);
if (close(fd) != 0) e(3);
system("> /tmp/sema.38d");
system("while test -f /tmp/sema.38d; do sleep 1; done");
if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(4);
if (write(fd, "three ", 6) != 6) e(5);
if (close(fd) != 0) e(6);
system("> /tmp/sema.38d");
exit(0);
default:
while (stat("/tmp/sema.38d", &st) != 0) sleep(1);
if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(7);
if (write(fd, "two ", 4) != 4) e(8);
if (close(fd) != 0) e(9);
unlink("/tmp/sema.38d");
while (stat("/tmp/sema.38d", &st) != 0) sleep(1);
if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(10);
if (write(fd, "four", 5) != 5) e(11);
if (close(fd) != 0) e(12);
if (wait(&stat_loc) == -1) e(13);
if (stat_loc != 0) e(14); /* The alarm went off? */
unlink("/tmp/sema.38d");
}
if ((fd = open("testing", O_RDONLY)) != 3) e(15);
if (read(fd, buf, BUF_SIZE) != 19) e(16);
if (strcmp(buf, "one two three four") != 0) e(17);
if (close(fd) != 0) e(18);
/* Non written bytes in regular files should be zero. */
memset(buf2, '\0', BUF_SIZE);
if ((fd = open("bigfile", O_RDWR | O_CREAT, 0644)) != 3) e(19);
if (lseek(fd, (off_t) 102400, SEEK_SET) != (off_t) 102400L) e(20);
if (read(fd, buf, BUF_SIZE) != 0) e(21);
if (write(fd, ".", 1) != 1) e(22);
Stat("bigfile", &st);
if (st.st_size != (off_t) 102401) e(23);
if (lseek(fd, (off_t) 0, SEEK_SET) != 0) e(24);
for (i = 0; i < 102400 / BUF_SIZE; i++) {
if (read(fd, buf, BUF_SIZE) != BUF_SIZE) e(25);
if (memcmp(buf, buf2, BUF_SIZE) != 0) e(26);
}
if (close(fd) != 0) e(27);
}
void test38c()
{ /* Test correct error behavior. */
char buf[BUF_SIZE];
int fd, tube[2], stat_loc;
struct stat st;
pid_t pid;
#ifdef SIGACTION
struct sigaction act, oact;
#else
void (*oldfunc) (int);
#endif
subtest = 3;
System("rm -rf ../DIR_38/*");
/* To test if writing processes on closed pipes are signumbered. */
#ifdef SIGACTION
act.sa_handler = setsignumber;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(SIGPIPE, &act, &oact) != 0) e(1);
#else
oldfunc = signal(SIGPIPE, setsignumber);
#endif
/* Non valid file descriptors should be an error. */
for (fd = -111; fd < 0; fd++) {
errno = 0;
if (read(fd, buf, BUF_SIZE) != -1) e(2);
if (errno != EBADF) e(3);
}
for (fd = 3; fd < 111; fd++) {
errno = 0;
if (read(fd, buf, BUF_SIZE) != -1) e(4);
if (errno != EBADF) e(5);
}
for (fd = -111; fd < 0; fd++) {
errno = 0;
if (write(fd, buf, BUF_SIZE) != -1) e(6);
if (errno != EBADF) e(7);
}
for (fd = 3; fd < 111; fd++) {
errno = 0;
if (write(fd, buf, BUF_SIZE) != -1) e(8);
if (errno != EBADF) e(9);
}
/* Writing a pipe with no readers should trigger SIGPIPE. */
if (pipe(tube) != 0) e(10);
close(tube[0]);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
signumber = 0;
if (write(tube[1], buf, BUF_SIZE) != -1) e(11);
if (errno != EPIPE) e(12);
if (signumber != SIGPIPE) e(13);
if (close(tube[1]) != 0) e(14);
exit(0);
default:
close(tube[1]);
if (wait(&stat_loc) == -1) e(15);
if (stat_loc != 0) e(16); /* Alarm? */
}
/* Writing a fifo with no readers should trigger SIGPIPE. */
System("> /tmp/sema.38e");
if (mkfifo("fifo", 0666) != 0) e(17);
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
if ((fd = open("fifo", O_WRONLY)) != 3) e(18);
system("while test -f /tmp/sema.38e; do sleep 1; done");
signumber = 0;
if (write(fd, buf, BUF_SIZE) != -1) e(19);
if (errno != EPIPE) e(20);
if (signumber != SIGPIPE) e(21);
if (close(fd) != 0) e(22);
exit(0);
default:
if ((fd = open("fifo", O_RDONLY)) != 3) e(23);
if (close(fd) != 0) e(24);
unlink("/tmp/sema.38e");
if (wait(&stat_loc) == -1) e(25);
if (stat_loc != 0) e(26); /* Alarm? */
}
#ifdef SIGACTION
/* Restore normal (re)action to SIGPIPE. */
if (sigaction(SIGPIPE, &oact, NULL) != 0) e(27);
#else
signal(SIGPIPE, oldfunc);
#endif
/* Read from fifo should return -1 and set errno to EAGAIN. */
System("rm -rf /tmp/sema.38[fgh]");
switch (fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
system("while test ! -f /tmp/sema.38f; do sleep 1; done");
System("rm -rf /tmp/sema.38f");
if ((fd = open("fifo", O_WRONLY | O_NONBLOCK)) != 3) e(28);
close(creat("/tmp/sema.38g", 0666));
system("while test ! -f /tmp/sema.38h; do sleep 1; done");
if (close(fd) != 0) e(38);
System("rm -rf /tmp/sema.38h");
exit(0);
default:
if ((fd = open("fifo", O_RDONLY | O_NONBLOCK)) != 3) e(30);
close(creat("/tmp/sema.38f", 0666));
system("while test ! -f /tmp/sema.38g; do sleep 1; done");
System("rm -rf /tmp/sema.38g");
if (read(fd, buf, BUF_SIZE) != -1) e(31);
if (errno != EAGAIN) e(32);
if (read(fd, buf, BUF_SIZE) != -1) e(33);
if (errno != EAGAIN) e(34);
if (read(fd, buf, BUF_SIZE) != -1) e(35);
if (errno != EAGAIN) e(36);
close(creat("/tmp/sema.38h", 0666));
while (stat("/tmp/sema.38h", &st) == 0) sleep(1);
if (read(fd, buf, BUF_SIZE) != 0) e(37);
if (close(fd) != 0) e(38);
if (wait(&stat_loc) == -1) e(39);
if (stat_loc != 0) e(40); /* Alarm? */
}
System("rm -rf fifo");
/* If a read is interrupted by a SIGNAL. */
if (pipe(tube) != 0) e(41);
switch (pid = fork()) {
case -1: printf("Can't fork\n"); break;
case 0:
alarm(20);
#ifdef SIGACTION
act.sa_handler = setsignumber;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
if (sigaction(SIGUSR1, &act, &oact) != 0) e(42);
#else
oldfunc = signal(SIGUSR1, setsignumber);
#endif
if (read(tube[0], buf, BUF_SIZE) != -1) e(43);
if (errno != EINTR) e(44);
if (signumber != SIGUSR1) e(45);
#ifdef SIGACTION
/* Restore normal (re)action to SIGPIPE. */
if (sigaction(SIGUSR1, &oact, NULL) != 0) e(46);
#else
signal(SIGUSR1, oldfunc);
#endif
close(tube[0]);
close(tube[1]);
exit(0);
default:
/* The sleep 1 should give the child time to start the read. */
sleep(1);
close(tube[0]);
kill(pid, SIGUSR1);
wait(&stat_loc);
if (stat_loc != 0) e(47); /* Alarm? */
close(tube[1]);
}
}
void setsignumber(signum)
int signum;
{
signumber = signum;
}
Reference in New Issue View Git Blame Copy Permalink