48 constexpr int WRITE = 1;  variable
258             dup2(fds[WRITE], STDOUT_FILENO); // Redirect stdout to pipe  in CustomPopen()
259             CHECK_TRUE(CustomFdClose(fds[WRITE]) == 0, nullptr, "CustomFdClose failed!");  in CustomPopen()
261             CHECK_TRUE(CustomFdClose(fds[WRITE]) == 0, nullptr, "CustomFdClose failed!");  in CustomPopen()
277 …     CHECK_TRUE(CustomFdClose(fds[WRITE]) == 0, nullptr, "%s %d CustomFdClose failed! errno(%s)\n",  in CustomPopen()
294     return fdopen(fds[WRITE], "w");  in CustomPopen()
320             CHECK_TRUE(CustomFdClose(fds[WRITE]) == 0, -1, "CustomFdClose failed!");  in CustomPclose()
321         } else if (fileno(fp) == fds[WRITE]) {  in CustomPclose()
322             fds[WRITE] = -1;  in CustomPclose()
340     CHECK_TRUE(fds[READ] != -1 && fds[WRITE] != -1, -1, "END fds[READ/WRITE]=-1");  in CustomPUnblock()
348         write(fds[WRITE], eof, strlen(eof) + 1);  in CustomPUnblock()