76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
#include <unistd.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include "util.h"
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#define DEBUG
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int sz_mem[] = {
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4 * (1ULL<<10),
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2 * (1ULL<<20),
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1 * (1ULL<<30),
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134217728};
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#define SZ_INDEX 0
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int main(int argc, char **argv)
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{
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void *mem;
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int ret = 0;
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pid_t pid;
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int status;
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key_t key = ftok(argv[0], 0);
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int shmid;
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shmid = shmget(key, sz_mem[SZ_INDEX], IPC_CREAT | 0660);
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CHKANDJUMP(shmid == -1, 255, "shmget failed: %s\n", strerror(errno));
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pid = fork();
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CHKANDJUMP(pid == -1, 255, "fork failed\n");
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if (pid == 0) {
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mem = shmat(shmid, NULL, 0);
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CHKANDJUMP(mem == (void *)-1, 255, "shmat failed: %s\n",
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strerror(errno));
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*((unsigned long *)mem) = 0x1234;
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ret = shmdt(mem);
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CHKANDJUMP(ret == -1, 255, "shmdt failed\n");
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_exit(123);
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} else {
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mem = shmat(shmid, NULL, 0);
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CHKANDJUMP(mem == (void *)-1, 255, "shmat failed: %s\n",
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strerror(errno));
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ret = waitpid(pid, &status, 0);
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CHKANDJUMP(ret == -1, 255, "waitpid failed\n");
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printf("%lx\n", *((unsigned long *)mem));
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#if 0
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struct shmid_ds buf;
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ret = shmctl(shmid, IPC_RMID, &buf);
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CHKANDJUMP(ret == -1, 255, "shmctl failed\n");
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#endif
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ret = shmdt(mem);
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CHKANDJUMP(ret == -1, 255, "shmdt failed\n");
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}
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fn_exit:
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return ret;
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fn_fail:
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goto fn_exit;
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}
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