What Is A File Descriptor File Descriptor Creation and Redirection to stdout We need to use 3 and Beyond to create our File Descriptor That s because 0 1 and 2 are reserved File Descriptors For example we can create File Descriptor 3 and move its output to File Descriptor 1 i e stdout To do so run the following command exec 3 1
In Unix Linux operating systems a file descriptor is an abstract indicator handle used to access a file or other IO input output resource such as a pipe or network socket Normally a file descriptors index into a per process file descriptor table maintained by the kernel in Linux Unix OS that in turn indexes into a system wide table of files opened by all processes A file descriptor is an index into an array of pointers to open file descriptions Since the open file descriptions are always accessed through those pointers never by numerical index in some array drawing them as a contiguous column of boxes is a little misleading
What Is A File Descriptor
What Is A File Descriptor
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File Pointer is a pointer to a C structure returned by fopen library function which is used to identifying a file wrapping the file descriptor buffering functionality and all other functionality needed for I O operation The file pointer is of type FILE whose definition can be found in usr include stdio h From the answer given by ric Malenfant AFAIK there is no way to do this in standard C Depending on your platform your implementation of the standard library may offer as a nonstandard extension a fstream constructor taking a file descriptor as input
You can test if the file descriptor is open or not by attempting to redirect to it early and if it fails open the desired numbered file descriptor to something like dev null I do this regularly within scripts and leverage the additional file descriptors to pass back additional details or responses beyond return script sh File descriptor is a positive integer index of a process s exlusive file descriptor table The items of the file descriptor table are references to a system wide open file description table The items of the open file description table includes references to inodes and some attributes of the opened resources
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There is a way to get file descriptor from fstream and then convert it to FILE via fdopen Personally I don t see any need in FILE but with file descriptor you may do many interesting things such as redirecting dup2 Solution When you open a file using the open function you get a file descriptor that is always the lowest numbered file descriptor not currently open for the process This is usually 3 for the first file opened 4 for the second and so on A file descriptor remains open until it is explicitly closed or until the process terminates
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https://linuxopsys.com › file-descriptors
File Descriptor Creation and Redirection to stdout We need to use 3 and Beyond to create our File Descriptor That s because 0 1 and 2 are reserved File Descriptors For example we can create File Descriptor 3 and move its output to File Descriptor 1 i e stdout To do so run the following command exec 3 1
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In Unix Linux operating systems a file descriptor is an abstract indicator handle used to access a file or other IO input output resource such as a pipe or network socket Normally a file descriptors index into a per process file descriptor table maintained by the kernel in Linux Unix OS that in turn indexes into a system wide table of files opened by all processes
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