timeradd,   timersub,   timercmp,   timerclear,  timerisset  -  timeval


   #include <sys/time.h>

   void timeradd(struct timeval *a, struct timeval *b,
                 struct timeval *res);

   void timersub(struct timeval *a, struct timeval *b,
                 struct timeval *res);

   void timerclear(struct timeval *tvp);

   int timerisset(struct timeval *tvp);

   int timercmp(struct timeval *a, struct timeval *b, CMP);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   All functions shown above:
       Since glibc 2.19:
       Glibc 2.19 and earlier:


   The macros are provided to operate on timeval  structures,  defined  in
   <sys/time.h> as:

       struct timeval {
           time_t      tv_sec;     /* seconds */
           suseconds_t tv_usec;    /* microseconds */

   timeradd()  adds  the time values in a and b, and places the sum in the
   timeval pointed  to  by  res.   The  result  is  normalized  such  that
   res->tv_usec has a value in the range 0 to 999,999.

   timersub()  subtracts the time value in b from the time value in a, and
   places the result in the timeval pointed to  by  res.   The  result  is
   normalized  such  that  res->tv_usec  has  a  value  in  the range 0 to

   timerclear() zeros out the timeval structure pointed to by tvp, so that
   it represents the Epoch: 1970-01-01 00:00:00 +0000 (UTC).

   timerisset()  returns  true  (nonzero)  if  either field of the timeval
   structure pointed to by tvp contains a nonzero value.

   timercmp() compares the timer values in a and b  using  the  comparison
   operator  CMP, and returns true (nonzero) or false (0) depending on the
   result of the comparison.  Some systems (but not Linux/glibc),  have  a
   broken timercmp() implementation, in which CMP of >=, <=, and == do not
   work; portable applications can instead use

       !timercmp(..., <)
       !timercmp(..., >)
       !timercmp(..., !=)


   timerisset() and timercmp() return true (nonzero) or false (0).


   No errors are defined.


   Not in POSIX.1.  Present on most BSD derivatives.


   gettimeofday(2), time(7)


   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at

More Linux Commands

XrmPutResource(3) - store database resources (Man Page).....
If database contains NULL, XrmPutResource creates a new database and returns a pointer to it. XrmPutResource is a convenience function that calls XrmStringToBin

ntdbbackup(8) tool for backing up and for validating the int
This tool is part of the samba(1) suite. ntdbbackup is a tool that may be used to backup samba .ntdb files. This tool may also be used to verify the integrity o

Tcl_ValidateAllMemory(3) - Validated memory allocation inter
These functions provide access to Tcl memory debugging information. They are only functional when Tcl has been compiled with TCL_MEM_DEBUG defined at compile-ti

ldap_syntax2name(3) - Schema definition handling routines...
These routines are used to parse schema definitions in the syntax defined in RFC 4512 into structs and handle these structs. These routines handle four kinds of

XSetWMClientMachine(3) - set or read a window's WM_CLIENT_MA
The XSetWMClientMachine convenience function calls XSetTextProperty to set the WM_CLIENT_MACHINE property. The XGetWMClientMachine convenience function performs

sha384(1ssl) message digests (Commands - Linux man page)....
The digest functions output the message digest of a supplied file or files in hexadecimal. The digest functions also generate and verify digital signatures usin

pam_winbind(8) - PAM module for Winbind - Linux manual page
This tool is part of the samba(7) suite. pam_winbind is a PAM module that can authenticate users against the local domain by talking to the Winbind daemon. SYNO

set_form_term(3form) - set hooks for automatic invocation by
These functions make it possible to set hook functions to be called at various points in the automatic processing of input event codes by form_driver. The funct

perlebcdic(1) - Considerations for running Perl on EBCDIC pl
An exploration of some of the issues facing Perl programmers on EBCDIC based computers. We do not cover localization, internationalization, or multi-byte charac

TIFFSetDirectory(3tiff) - set the current directory for an o
TIFFSetDirectory changes the current directory and reads its contents with TIFFReadDirectory. The parameter dirnum specifies the subfile/directory as an integer

patch(1) - apply a diff file to an original - Linux man page
patch takes a patch file patchfile containing a difference listing produced by the diff program and applies those differences to one or more original files, pro

getutxid(3) - access utmp file entries - Linux manual page
New applications should use the POSIX.1-specified utmpx versions of these functions; see CONFORMING TO. utmpname() sets the name of the utmp-format file for the

We can't live, work or learn in freedom unless the software we use is free.