forked from rcore-os/zCore
51 lines
853 B
C
51 lines
853 B
C
#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE 700
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdio.h>
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static const char path[] = ".";
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static const int id = 'h';
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#define T(f) assert((f)+1 != 0)
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#define EQ(a,b) assert((a) == (b))
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static void get()
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{
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key_t k;
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int shmid;
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void *p;
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T(k = ftok(path, id));
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T(shmid = shmget(k, 0, 0));
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errno = 0;
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if ((p=shmat(shmid, 0, SHM_RDONLY)) == 0)
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printf("shmat failed: %s\n", strerror(errno));
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if (strcmp((char *)p, "test data") != 0)
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printf("reading shared mem failed: got \"%.100s\" want \"test data\"\n", (char *)p);
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/* cleanup */
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T(shmdt(p));
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T(shmctl(shmid, IPC_RMID, 0));
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}
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int main(void)
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{
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int p;
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int status;
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get();
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return 0;
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}
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