Execute and terminate an executable program in Linux C program

Execvp () is available for executing and terminating an executable program ():

Run:
Char * Arg [] = {"snmpd", "-C snmpd. conf "};
Execvp (ARG [0], Arg []);

Killall termination:

If (find_pid_by_name ("dnsmasq") <0)
Return ret;
Char * Arg [] = {"killall", "-9", "snmpd "};
 
Execvp (ARG [0], Arg []);

The find_pid_by_name () implementation is as follows:
/* From busybox find_pid_by_name.c */
Int find_pid_by_name (char * pidname)
{
Dir * dir;
Struct dirent * next;
Pid_t * pidlist = NULL;
Int I = 0;

Dir = opendir ("/proc ");

While (next = readdir (DIR ))! = NULL ){
File * status;
Char filename [read_buf_size];
Char buffer [read_buf_size];
Char name [read_buf_size];

/* Must skip ".." since that is outside/proc */
If (strcmp (next-> d_name, "..") = 0)
Continue;

/* If it isn't a number, we don't want it */
If (! Isdigit (* Next-> d_name ))
Continue;

Sprintf (filename, "/proc/% S/status", next-> d_name );
If (! (Status = fopen (filename, "R "))){
Continue;
}
If (fgets (buffer, READ_BUF_SIZE-1, status) = NULL ){
Fclose (Status );
Continue;
}
Fclose (Status );

/* Buffer shoshould contain a string like "Name: binary_name "*/
Sscanf (buffer, "% * S % s", name );
// Printf ("buffer = [% s] Name = [% s]/n", buffer, name );
If (strcmp (name, pidname) = 0 ){
/*
Pidlist = realloc (pidlist, sizeof (pid_t) * (I + 2 ));
Pidlist [I ++] = strtol (next-> d_name, null, 0 );
*/
Closedir (DIR );
Return 0;
}
}

If (DIR)
Closedir (DIR );
Return-1;
}