forked from p7px8vou9/system_call_expand
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51 lines
1.0 KiB
51 lines
1.0 KiB
/*
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* 成功测试时的输出：
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* "getdents success."
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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struct linux_dirent {
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long d_ino;
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off_t d_off;
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unsigned short d_reclen;
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char d_name[];
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};
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int getdents(int fd, struct linux_dirent *dirp, unsigned long len){
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return syscall(SYS_getdents, fd, dirp, len);
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}
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char buf[512];
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void test_getdents(void){
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int fd, nread, bpos;
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struct linux_dirent *dirp, *tmp;
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dirp = (struct linux_dirent *)buf;
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fd = open(".", O_RDONLY);
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printf("open fd: %d\n", fd);
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nread = getdents(fd, dirp, 512);
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printf("getdents fd: %d\n", nread);
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assert(nread != -1);
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for(bpos = 0; bpos < nread;){
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tmp = (struct linux_dirent *)(buf + bpos);
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printf( "%s\t", tmp->d_name);
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bpos += tmp->d_reclen;
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}
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printf("\n");
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printf("getdents success.\n");
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close(fd);
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}
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int main(void){
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test_getdents();
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return 0;
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}
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