Explain the difference between getgid () function and Getegid () function in C language _c language

C language Getgid () function: Get the group recognition code function

Header file:

#include <unistd.h>  #include <sys/types.h>

To define a function:

gid_t getgid (void);

Function Description: Getgid () is used to obtain the group identifier that executes the current process.

Return value: Return group identification code

Example

#include <unistd.h>
#include <sys/types.h>
main ()
{
  printf ("GID is%d\n", Getgid ());
}

Perform:

GID is 0//When executing the sample program with root identity

C language Getegid () function: Get Group identification code

Header file:

 #include <unistd.h>  #include <sys/types.h>

To define a function:

gid_t getegid (void);

Function Description: Getegid () is used to obtain a valid group identifier for the execution of the current process. A valid group identifier is used to determine the permissions of a group when a process executes.

Return value: Returns a valid group identification code.

Example

#include <unistd.h>
#include <sys/types.h>
main ()
{
  printf ("Egid is%d\n", Getegid ());
}

Perform:

Egid is 0//When executing the sample program with root identity