[root@localhost apue.2e]# cat apue15.11.c
#include "apue.h" #include <sys/shm.h> #define ARRAY_SIZE 40000 #define MALLOC_SIZE 100000 #define SHM_SIZE 100000 #define SHM_MODE 0600 /* user read/write */ char array[ARRAY_SIZE]; /* uninitialized data = bss */ static int arraystatic[ARRAY_SIZE] = {0}; int uninitdata; int initdata = 1; static int printString(void) { printf("hello guy!!!\n"); return 1; } int main(void) { int shmid; char *ptr, *shmptr; static int testStatic = 0; auto int testAuto = 1; printf("array[] from %lx to %lx\n", (unsigned long)&array[0], (unsigned long)&array[ARRAY_SIZE]); printf("stack around %lx\n", (unsigned long)&shmid); if ((ptr = malloc(MALLOC_SIZE)) == NULL) err_sys("malloc error"); printf("malloced from %lx to %lx\n", (unsigned long)ptr, (unsigned long)ptr+MALLOC_SIZE); printf("static data in %lx\n", (unsigned long)&testStatic); printf("auto data in %lx\n",(unsigned long)&testAuto); if ((shmid = shmget(IPC_PRIVATE, SHM_SIZE, SHM_MODE)) < 0) err_sys("shmget error"); if ((shmptr = shmat(shmid, 0, 0)) == (void *)-1) err_sys("shmat error"); printf("shared memory attached from %lx to %lx\n", (unsigned long)shmptr, (unsigned long)shmptr+SHM_SIZE); if (shmctl(shmid, IPC_RMID, 0) < 0) err_sys("shmctl error"); int prt = printString(); printf("uninitdata address is : %lx\n",(unsigned long)&uninitdata); printf("initdata address is : %lx\n",(unsigned long)&initdata); printf("printString address is : %lx\n",(unsigned long)&printString); printf("static array initdata address is from %lx to %lx \n",(unsigned long)&arraystatic[0],(unsigned long)&arraystatic[ARRAY_SIZE]); exit(0); }运行结果为：
[root@localhost apue.2e]# ./apue15.11.o
array[] from 6289a0 to 6325e0 stack around 7fff37c612b4 malloced from 1a7d010 to 1a956b0 static data in 628980 auto data in 7fff37c612b0 shared memory attached from 7f6af5f06000 to 7f6af5f1e6a0 hello guy!!! uninitdata address is : 6325e0 initdata address is : 60183c printString address is : 400f6f static array initdata address is from 601880 to 628980分析上面所有在存储区的结构分配。。。。