dup2 close
The close-on-exec flag (FD_CLOEXEC; see fcntl(2)) for the duplicate descriptor is off. dup2() The dup2() system call performs the same task as dup(), but instead ... , When you do int fd = open("log", O_RDWR);. The open file can be any file descriptor. Just because you closed STDOUT_FILENO does not ...,close(fildes2); fid = fcntl(fildes, F_DUPFD, fildes2);. with the following exceptions: If fildes2 is negative or greater than or equal to OPEN_MAX, the dup2() function ... ,dup, dup2 - 複製一個文件描述符SYNOPSIS #include int dup(int oldfd); ... The two descriptors do not share file descriptor flags (the close-on-exec flag). , ... else if (pid==0) /* child process */ dup2(pfd[1], STDOUT_FILENO); close(pfd[0]); /* execute CGI */ execlp(filename, filename, NULL); exit(0); } ..., Not sure about the logic. But the way you use dup2 is not right. The following code in the "Even" process: close(STDIN_FILENO); ..., So, when you call dup2(a, b) , either one of these is true: a == b . In this case, nothing happens and dup2() returns prematurely. No file descriptors are closed. a != b . In this case, b is closed if necessary, and then b is made to refer to the same fi, open creates a file description in the kernel and the returned file descriptor is kind of like a pointer to it from userspace, unless it's a negative ..., close(0); close(1); close(2); if (!tty || !*tty) if (open("/dev/null", O_RDWR|O_NONBLOCK) >= 0) dup(0), dup(0); return; } -- 這沒營養dup(0) 還作兩 ..., file handle for standard output. */. //重定向nul到STDOUT dup2(nul, STDOUT);. /* close the handle for DUMMY.FIL */.
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 dup2 close 相關參考資料
dup(2) - Linux manual page - man7.org
The close-on-exec flag (FD_CLOEXEC; see fcntl(2)) for the duplicate descriptor is off. dup2() The dup2() system call performs the same task as dup(), but instead ... http://man7.org dup2 vs close+open for stdout redirection - Stack Overflow
When you do int fd = open("log", O_RDWR);. The open file can be any file descriptor. Just because you closed STDOUT_FILENO does not ... https://stackoverflow.com dup2() -- duplicate open file descriptor onto another file ...
close(fildes2); fid = fcntl(fildes, F_DUPFD, fildes2);. with the following exceptions: If fildes2 is negative or greater than or equal to OPEN_MAX, the dup2() function ... https://www.mkssoftware.com dup2()函數UnixLinux - UnixLinux係統調用 - 極客書
dup, dup2 - 複製一個文件描述符SYNOPSIS #include int dup(int oldfd); ... The two descriptors do not share file descriptor flags (the close-on-exec flag). http://tw.gitbook.net fork()、pipe()、dup2() 和execlp() - Fred
... else if (pid==0) /* child process */ dup2(pfd[1], STDOUT_FILENO); close(pfd[0]); /* execute CGI */ execlp(filename, filename, NULL); exit(0); } ... http://fred-zone.blogspot.com How to use dup2close correctly to connect these three ...
Not sure about the logic. But the way you use dup2 is not right. The following code in the "Even" process: close(STDIN_FILENO); ... https://stackoverflow.com Understanding dup2 and closing file descriptors - Stack ...
So, when you call dup2(a, b) , either one of these is true: a == b . In this case, nothing happens and dup2() returns prematurely. No file descriptors are closed. a != b . In this case, b is closed i... https://stackoverflow.com Why do we close the file descriptor after calling dup2? - Stack ...
open creates a file description in the kernel and the returned file descriptor is kind of like a pointer to it from userspace, unless it's a negative ... https://stackoverflow.com [C code] dup() dup2() 奇妙的FD複製.... - 筆記人生
close(0); close(1); close(2); if (!tty || !*tty) if (open("/dev/null", O_RDWR|O_NONBLOCK) >= 0) dup(0), dup(0); return; } -- 這沒營養dup(0) 還作兩 ... https://bjglife.blogspot.com [轉] linux 經典的例子解釋dup dup2 文件描述符重定向函數輸入 ...
file handle for standard output. */. //重定向nul到STDOUT dup2(nul, STDOUT);. /* close the handle for DUMMY.FIL */. https://www.gomcu.com |