C Programming. How to deep copy a struct?
- by user69514
I have the following two structs where "child struct" has a "rusage struct" as an element.
Then I create two structs of type "child" let's call them childA and childB
How do I copy just the rusage struct from childA to childB?
typedef struct{
int numb;
char *name;
pid_t pid;
long userT;
long systemT;
struct rusage usage;
}child;
typedef struct{
struct timeval ru_utime; /* user time used */
struct timeval ru_stime; /* system time used */
long ru_maxrss; /* maximum resident set size */
long ru_ixrss; /* integral shared memory size */
long ru_idrss; /* integral unshared data size */
long ru_isrss; /* integral unshared stack size */
long ru_minflt; /* page reclaims */
long ru_majflt; /* page faults */
long ru_nswap; /* swaps */
long ru_inblock; /* block input operations */
long ru_oublock; /* block output operations */
long ru_msgsnd; /* messages sent */
long ru_msgrcv; /* messages received */
long ru_nsignals; /* signals received */
long ru_nvcsw; /* voluntary context switches */
long ru_nivcsw; /* involuntary context switches */
}rusage;
I did the following, but I guess it copies the memory location, because if I changed the value of usage in childA, it also changes in childB.
memcpy(&childA,&childB, sizeof(rusage));
I know that gives childB all the values from childA. I have already taken care of the others fields in childB, I just need to be able to copy the rusage struct called usage that resides in the "child" struct.
