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

• raise - send signal to calling process
• rand, srand - pseudo-random number generator (int)
• rand_r - pseudo-random number generator (int, thread-safe)
• random - create pseudo-random numbers
• read - read bytes from file
• readdir, readdir64 - read directory
• readdir_r - read directory (thread-safe)
• readlink, readlinkat - read contents of symbolic link
• readv - read array from file
• realloc - memory reallocator
• realpath - output real file name/pathname
• re_comp, re_exec - compile and execute regular expressions
• regcmp, regex - compile and execute regular expression
• regcomp, regexec, regerror, regfree - interpret regular expression
• regexp: advance, compile, step, loc1, loc2, locs - compile and match regular expressions
• remainder, remainderf, remainderl - remainder from division
• remove - remove files
• remque - remove element from queue
• remquo, remquof, remquol - remainder from division
• rename, renameat - rename file
• rewind - reset file position indicator to start of stream
• rewinddir - reset file position indicator to start of directory stream
• rindex - get last occurrence of character in string
• rint, rintf, rintl - round to nearest integer value
• rmdir - remove directory
• round, roundf, roundl - round up to next integer value