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 random(3) -- random number generator.
    The random() function uses a non-linear additive feedback random number generator employing a default table of size 31 long integers to return successive pseudo-random numbers in the range from 0 to R...
 rcmd(3) -- routines for returning a stream to a remote command
    The rcmd() function is used by the super-user to execute a command on a remote machine using an authentication scheme based on reserved port numbers. The rresvport() function returns a descriptor to a...
 readdir(3) -- read a directory
    The readdir() function returns a pointer to a dirent structure representing the next directory entry in the directory stream pointed to by dir. It returns NULL on reaching the end-of-file or if an err...
 readv(3) -- read or write data into multiple buffers
    The readv() function reads count blocks from the file associated with the file descriptor filedes into the multiple buffers described by vec- tor. The writev() function writes at most count blocks des...
 realpath(3) -- return the canonicalized absolute pathname
    realpath expands all symbolic links and resolves references to '/./', '/../' and extra '/' characters in the null terminated string named by path and stores the canonicalized absolute pathname i...
 recno(3) -- record number database access method
    The routine dbopen is the library interface to database files. One of the supported file formats is record number files. The general description of the database access methods is in dbopen(3), this ma...
 regex(3) -- POSIX regex functions
 remove(3) -- delete a name and possibly the file it refers to
    remove deletes a name from the filesystem. It calls unlink for files, and rmdir for directories. If the removed name was the last link to a file and no processes have the file open the file is deleted...
 resolver(3) -- resolver routines
    These functions make queries to and interpret the responses from Internet domain name servers. The res_init() function reads the configuration files (see resolv+(8)) to get the default domain name, se...
 rewinddir(3) -- reset directory stream
    The rewinddir() function resets the position of the directory stream dir to the beginning of the directory.
 re_comp(3) -- BSD regex functions
    re_comp is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the pattern buffer, which is overwritten by subsequent use of re_com...
 rint(3) -- round to nearest integer
    The nearbyint functions round their argument to an integer value in floating point format, using the current rounding direction and without raising the inexact exception. The rint functions do the sam...
 round(3) -- round to nearest integer, away from zero
    These functions round x to the nearest integer, but round halfway cases away from zero (regardless of the current rounding direction), instead of to the nearest even integer like rint().
 rpc(3) -- library routines for remote procedure calls
 rtnetlink(3) -- Macros to manipuate rtnetlink messages
    All rtnetlink(7) messages consist of a netlink(7) message header and appended attributes. The attributes should be only manipulated using the macros provided here. RTA_OK(rta, attrlen) returns true if...
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