F_GETFL 我的理解是file get flag #include <stdio.h> #include <fcntl.h> #include <unistd.h> int main() { int flag; int fd = open("2.txt",O_RDWR); if(-1 == fd) perror("open"); flag = fcntl(fd,F_GETFL); if(-1 == flag) perror("fcntl"); int accmode; accmode = flag...
通过使用fcntl函数的f_getfl操作命令,可以获取到该文件描述符的状态标志信息。 在使用fcntl函数时,需要指定三个参数:文件描述符fd,操作命令cmd和一个可选参数arg。当我们使用f_getfl操作命令时,arg参数可以传入任意值,因为在获取文件描述符的状态标志时并不需要额外的参数。 下面是一个简单的示例代码,用来演示如何使用...
f_getflfd Function f_getfl invokes the fcntl callable service to get the file status flags for a file. Parameters fd The file descriptor (a number) for the file. Usage notes RETVAL returns the file status flags as a numeric value (see REXX predefined variables): FlagDescription O_CREAT...
fcntl(F_GETFL) This implementsfcntl(F_GETFL)in three steps: Move file status flags (O_APPENDandO_NONBLOCK) fromOpenOptionsinto a newfd::StatusFlagstype as per POSIX. ReplaceObjectInterface::ioctl(&self, cmd: IoCtl, value: bool)withObjectInterface::set_status_flags(&self, status_flags: fd:...
Function f_getfl invokes the fcntl callable service to get the file status flags for a file. Parameters fd The file descriptor (a number) for the file.Usage notes RETVAL returns the file status flags as a numeric value (see REXX predefined variables): FlagDescription O_CREAT Create the ...
flags =fcntl(fd,F_GETFL,0); flags |= O_NONBLOCK;fcntl(fd,F_SETFL,flags); 4、取消文件的某个flags,比如文件是非阻塞的,想设置成为阻塞: flags =fcntl(fd,F_GETFL,0); flags &= ~O_NONBLOCK;fcntl(fd,F_SETFL,flags); 获取和设置文件flags举例:: ...
The cygwin environment does, it seems, define F_GETFL so possibly that script expects to be run with cygwin perl. BTW, I notice that that web page has not been updated for 2 years, which may be significant. Ok, i'll try out some other ways (different standalone cygwin ssh ...
问fcntl和F_GETFL的意外返回值EN阻塞方式block，顾名思义，就是进程或是线程执行到这些函数时必须等待某...
New issue Jump to bottom Build on 1.30.0 fails:ares_event_configchg.c:370: error: ‘F_GETFL’ undeclared (first use in this function)#784 Closed barracuda156opened this issueJun 12, 2024· 2 comments Closed Build on 1.30.0 fails:ares_event_configchg.c:370: error: ‘F_GETFL’ undeclar...
许多 Linux 程序员在其工作中每天都在使用 find 命令。但是 find 给出的文件系统条目是有限的，如果你...