Tag: #file-descriptors

The magic shell string 3>&2 2>&1 1>&3- swaps stdout and stderr. It does with the dup2 system call to swap file descriptors. 2018-02-22

mode_t is a bitfield type in C that represents file permissions, including read, write, and execute permissions for the owner, group, and other classes. It provides symbolic constants to set and check these permissions. 2017-02-24

lsof lists open system resources, including pipes, sockets, and yes, files. It shows their type, owner, and location. 2017-02-20

To close a file descriptor in C, use the close system call. Multiple descriptors can reference the same underlying file or pipe. The pipe is only closed when all references are closed. 2017-02-16

Use the dup system call to duplicate a file descriptor in C, allowing two references to the same underlying pipe. 2017-02-15