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 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...
 scandir(3) -- scan a directory for matching entries
    The scandir() function scans the directory dir, calling select() on each directory entry. Entries for which select() returns non-zero are stored in strings allocated via malloc(), sorted using qsort()...
 scanf(3) -- input format conversion
    The scanf family of functions scans input according to a format as described below. This format may contain conversion specifiers; the results from such conversions, if any, are stored through the poi...
 seekdir(3) -- set the position of the next readdir() call in the directory stream.
    The seekdir() function sets the location in the directory stream from which the next readdir() call will start. seekdir() should be used with an offset returned by telldir().
 setbuf(3) -- stream buffering operations
    The three types of buffering available are unbuffered, block buffered, and line buffered. When an output stream is unbuffered, information appears on the destination file or terminal as soon as writte...
 setenv(3) -- change or add an environment variable
    The setenv() function adds the variable name to the environment with the value value, if name does not already exist. If name does exist in the environment, then its value is changed to value if overw...
 setjmp(3) -- save stack context for non-local goto
    setjmp() and longjmp() are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. setjmp() saves the stack context/environment in env for later use by longjm...
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