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This section describes the following functions, macros and external variables:

• ualarm - set interval timer
• ulimit - get and set process limits
• umask - get and set file mode creation mask
• umount - unmount file system (extension)
• uname - get basic data on current operating system
• ungetc - push byte back onto input stream
• ungetwc - push wide character back onto input stream
• unlink, unlinkat - remove link
• unlockpt - remove lock from master/slave pseudoterminal pair
• unsetenv - remove an environment variable
• usleep - suspend process for defined interval
• utime, utime64 - set file access and modification times
• utimensat, utimensat64 - Setting file access and update times
• utimes, utimes64 - set file access time and file modification time