Questions tagged [timeval]
56 questions
0
votes
1 answer
questions related to source code of PHP uniqid()
In PHP source code function uniqid() have following C code:
(I removed some types to shorten it)
//...
struct timeval tv;
gettimeofday(&tv, NULL);
int sec = (int) tv.tv_sec;
int usec = (int) (tv.tv_usec % 0x100000);
// The max value usec can have…
Nick
- 9,962
- 4
- 42
- 80
0
votes
1 answer
Switching between statements if the user inputs something: infinitely and with a timeout
To explain more clearly what I want to do, I want my code to check if the user inputs something (or if another file descriptor than 0 has data to read) every (let's say) 2.5 seconds and so until the program stops.
If the user inputs something, a…
TheReader
- 3
- 1
0
votes
1 answer
snprintf not printing out a converted timeval using strftime?
I have taken this answer from SO:
https://stackoverflow.com/a/2409054/997112
so that I can print timeval structs in a friendly format. I had to change "%s.%06d" for "%s.%06ld" because I was getting compiler warnings:
void printTimeval(struct…
user997112
- 29,025
- 43
- 182
- 361
0
votes
1 answer
select() doesn't use what is set for timeval
I have a snippet below - I've adjusted my tv_usec in several ways, but I keep sitting in a select() loop for almost exactly 10 seconds, regardless of what tv_usec is set at.
char buffer[512];
fd_set readfds;
struct timeval tv;
…
MrDuk
- 16,578
- 18
- 74
- 133
0
votes
2 answers
are these msec<->timeval functions correct?
I have a bug in this program, and I keep coming back to these two functions, but they look right to me. Anything wrong here?
long visual_time_get_msec(VisTime *time_)
{
visual_log_return_val_if_fail(time_ != NULL, 0);
return time_->tv_sec *…
Scott
- 5,135
- 12
- 57
- 74
0
votes
1 answer
How to write a macro which gets runtime of a function?
Suppose we want to know how long function A runs, we can write code like this
struct timeval tpstart,tpend;
gettimeofday(&tpstart,NULL);
A();
gettimeofday(&tpend,NULL);
float timeuse= tpend.tv_sec-tpstart.tv_sec +…
stonestrong
- 337
- 1
- 5
- 13
0
votes
1 answer
timeval variable declaration in linux
I am using timeval structure in order to get current system time. Normally if I declare it like that:
timeval curtime;
it is working. However I saw some code where people declare it as:
struct timeval curtime;
Is there any difference between these…
Avb Avb
- 545
- 2
- 13
- 25
0
votes
2 answers
Time returned by timeval structure is wrong in Ubuntu
I am trying to see the time taken by select function to moniter files, but when I try to print it, I get a very long number.Here is the code:
struct timeval to;
to.tv_usec=25;
nfds=select(maxfds+1,&readset,NULL,NULL,&to);
printf("Time left for…
Alfred
- 1,543
- 7
- 33
- 45
-1
votes
1 answer
How do I double timeval in C?
I am very new to C and I have the following code where I want to double the timeval, how can I do this?
#include
struct timeval t ={1, 10000};
while(1){
//some code to use timeval
Here I need to double the timeval. Meaning if…
MSH
- 297
- 1
- 3
- 12
-1
votes
1 answer
I am getting a negative value when I try to convert a uint64_t to struct timeval? //edited
#include
#include
#include
void convert(uint64_t offset )
{
struct timeval t;
t.tv_sec = offset / 1000000;
std::cout << "currentTimeOffset " << offset << "startTimeOffset " << t.tv_sec << std::endl;
…
ashok v
- 408
- 3
- 11
-6
votes
1 answer
How to convert from seconds to nanoseconds in a timeval struct?
I want to convert my timeval struct from seconds to nanoseconds, what is the best algorithm to achieve this?
ka123444
- 15
- 1
- 4