open return 0
Your conditional is off. Mind the parentheses. It should be: if ((fd2 = open(logFile, O_RDWR |O_APPEND | O_CREAT , 0666)) == -1) // ^^^ ^^^., I am out of idea what to do to resolve the problem! I need to use the open(file, for.., access) function to write a file. Never have the situation lik., When open returns 0, it's telling you that you should use fd 0 if you want to use the file you just opened. Did you perchance close stdin?, int open( const char *pathname, int flags, mode_t mode);. 返回值：成功返回新分配 ... if (fd == -1). perror ( "open file mytest" );. close(fd);. return 0;.,S_IRUSR means read for user (so without write permission). The first run the program create the file with permission -r-------- The second run fails with EPERM ... ,The return value of open() is a file descriptor, a small, nonnegative integer that is used in ... In addition, zero or more file creation flags and file status flags can be ... , Hello, I have an odd problem with using the open system call: it seems whenever I try to open an existing file in a certain program I've written, ..., 今天纠结dup的时候，无意间发现，open的返回值让我有点不敢相信，百思 ... text.t",O_RDWR) < 0) printf("open error-nProcess end-n"); return 0; }., I need to use the open(file, for.., access) function to write a file. Never have the situation like that: it is return 0 - zero. As a result all wri | The ...,It's because you're comparing it to -1 . outputfd doesn't get the result of open . It gets the result of the check for -1 .
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 open return 0 相關參考資料
File Descriptors, open() returns zero - Stack Overflow
Your conditional is off. Mind the parentheses. It should be: if ((fd2 = open(logFile, O_RDWR |O_APPEND | O_CREAT , 0666)) == -1) // ^^^ ^^^. https://stackoverflow.com Help: open(file,flag, acc) returns 0 and write to the screen ...
I am out of idea what to do to resolve the problem! I need to use the open(file, for.., access) function to write a file. Never have the situation lik. https://cboard.cprogramming.co linux open returns 0 - Stack Overflow
When open returns 0, it's telling you that you should use fd 0 if you want to use the file you just opened. Did you perchance close stdin? https://stackoverflow.com Linux系统调用之open(), close() - 乔部落格
int open( const char *pathname, int flags, mode_t mode);. 返回值：成功返回新分配 ... if (fd == -1). perror ( "open file mytest" );. close(fd);. return 0;. http://joe.is-programmer.com Open returns (-1) with O_CREAT when file already exists - Stack ...
S_IRUSR means read for user (so without write permission). The first run the program create the file with permission -r-------- The second run fails with EPERM ... https://stackoverflow.com open(2) - Linux manual page - man7.org
The return value of open() is a file descriptor, a small, nonnegative integer that is used in ... In addition, zero or more file creation flags and file status flags can be ... http://man7.org open(2) returns 0 - Linux Forums
Hello, I have an odd problem with using the open system call: it seems whenever I try to open an existing file in a certain program I've written, ... http://www.linuxforums.org open函数的返回值可能是0，1，2这三个中的任意一个吗？ - Jason ...
今天纠结dup的时候，无意间发现，open的返回值让我有点不敢相信，百思 ... text.t",O_RDWR) < 0) printf("open error-nProcess end-n"); return 0; }. https://blog.csdn.net Some how the open(file,flag, acc) returns 0 and write to the ...
I need to use the open(file, for.., access) function to write a file. Never have the situation like that: it is return 0 - zero. As a result all wri | The ... https://www.unix.com Why does open make my file descriptor 0? - Stack Overflow
It's because you're comparing it to -1 . outputfd doesn't get the result of open . It gets the result of the check for -1 . https://stackoverflow.com |