67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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char buf[512];
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int main(int argc, char** argv)
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{
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int fd, pid, i, j, n, total, pi;
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char* names[] = { "f0.e", "f1.e", "f2.e", "f3.e" };
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char* fname;
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int pids[4];
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for (pi = 0; pi < 4; pi++) {
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fname = names[pi];
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unlink(fname);
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pid = fork();
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pids[pi] = pid;
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if (pid < 0) {
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TestErr("fork failed");
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}
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if (pid == 0) {
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fd = open(fname, O_CREAT | O_RDWR, 0600);
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if (fd < 0) {
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TestErr("create failed");
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}
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memset(buf, '0' + pi, 512);
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for (i = 0; i < 12; i++) {
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if ((n = write(fd, buf, 500)) != 500) {
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TestErr("write failed");
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}
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}
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exit(0);
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}
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}
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for (pi = 0; pi < 4; pi++) {
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wait(pids[pi]);
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}
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for (i = 0; i < 4; i++) {
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fname = names[i];
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fd = open(fname, O_RDONLY);
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total = 0;
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while ((n = read(fd, buf, sizeof(buf))) > 0) {
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for (j = 0; j < n; j++) {
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if (buf[j] != '0' + i) {
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TestErr("wrong char");
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}
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}
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total += n;
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}
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close(fd);
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if (total != 12 * 500) {
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TestErr("wrong length");
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}
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unlink(fname);
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}
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return 0;
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}
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