The dup2() system function is used to create a copy of an existing file descriptor. In Linux, there are 3 standard file descriptors: stdin, stdout, stderr. The dup2() function copies a file descriptor to another file descriptor.
本节目标:1,文件共享打开文件内核数据结构一个进程两次打开同一个文件两个进程打开同一个文件2,复制文件描述符(dup、dup2、fcntl)一,文件共享1,一个进程打开两个文件内核数据结构说明:文件描述符表:每个进程都有一张,彼此独立,每个文件描述符表项都指向一个文件表
intdup2(intfildes,intfildes2); FieldDescription int fildesThe source file descriptor. This remains open after the call to dup2. int fildes2The destination file descriptor. This file descriptor will point to the same file as filedes after this call returns. ...
Often, the descriptors in the child are duplicated onto standard input or output. The child can then exec() another program, which inherits the standard streams. Let's look at the dup2() system call: 我们的子进程把它的输出重定向的管道的写端,然后,父进程将它的输入重定向到管道的读端 子进程...
EBUSY (Linux only) This may be returned by dup2() during a race condition with open() and dup(). EINTR The dup2() call was interrupted by a signal. EMFILE The process already has the maximum number of file descriptors open and tried to open a new one. WARNINGS...
由于很多用户的系统和程序都不同,因此TSINGSEE青犀视频研发团队往往需要根据用户的实际需求来对产品进行定制或者修改。有的客户需要 Arm 版本的 EasyDSS平台使用,因此我们也会在aarch64环境下编译EasyDSS。在编译过程中,出现报错 “undefined: syscall.Dup2”。
linux系统编程之文件与I0:文件描述符相关操作-dup,dup2,fcntl,本节目标:1,文件共享打开文件内核数据结构一个进程两次打开同一个文件两个进程打开同一个文件2,复制文件描述符(dup、dup2、fcntl) 一,文件共享1,一个进程打开两个文件内核数据结构说明:文件描述符
Linux dup() and dup2() System Calls Linux open() System Call 常见问题及解决方法 文件描述符泄漏:如果忘记关闭复制的文件描述符,可能会导致文件描述符泄漏。确保在使用完文件描述符后调用 close() 函数关闭它们。 权限问题:在尝试打开或复制文件描述符时,可能会遇到权限不足的问题。检查文件权限并确保程序有足...
Command to display dup manual in Linux: $ man 2 dup NAMEdup, dup2, dup3 - duplicate a file descriptor SYNOPSIS#include <unistd.h> int dup(int oldfd); int dup2(int oldfd, int newfd); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <fcntl.h> /* Obtain O_* ...
int dup(intfildes, intfildes2); DESCRIPTION Thedup2()function duplicates an open file descriptor. Specifically, it provides an alternate interface to the service provided by thefcntl()function using theF_DUPFDconstant command value, withfildes2for its third argument. The duplicated file descriptor...