cat hold_file.c #include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include <unistd.h> #include <string.h> #include <strings.h> #include <errno.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/wait.h> #include <fcntl.h> int main(int argc, char **argv) { int cnt = 0; while(1) { char name[64] ={0}; snprintf(name,sizeof(name),"%d.txt",cnt); int fd = creat(name,644);// creat() is equivalent to open() with flags equal to O_CREAT|O_WRONLY|O_TRUNC. sleep(10); ++cnt; } return 0; }
./a.out &
[1] 35724
lsof -p 35724 > log
创建文件未关闭，可以查看打开了哪些文件没有被关闭
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME a.out 35724 gec cwd DIR 0,50 4096 4468 /mnt/hgfs/share/file a.out 35724 gec rtd DIR 8,1 4096 2 / a.out 35724 gec txt REG 0,50 8712 4482 /mnt/hgfs/share/file/a.out a.out 35724 gec mem REG 8,1 1868984 927825 /lib/x86_64-linux-gnu/libc-2.23.so a.out 35724 gec mem REG 8,1 162632 927823 /lib/x86_64-linux-gnu/ld-2.23.so a.out 35724 gec 0u CHR 136,1 0t0 4 /dev/pts/1 a.out 35724 gec 1u CHR 136,1 0t0 4 /dev/pts/1 a.out 35724 gec 2u CHR 136,1 0t0 4 /dev/pts/1 a.out 35724 gec 3w REG 0,50 0 4483 /mnt/hgfs/share/file/0.txt a.out 35724 gec 4w REG 0,50 0 4484 /mnt/hgfs/share/file/1.txt a.out 35724 gec 5w REG 0,50 0 4485 /mnt/hgfs/share/file/2.txt a.out 35724 gec 6w REG 0,50 0 4486 /mnt/hgfs/share/file/3.txt a.out 35724 gec 7w REG 0,50 0 4487 /mnt/hgfs/share/file/4.txt a.out 35724 gec 8w REG 0,50 0 4488 /mnt/hgfs/share/file/5.txt a.out 35724 gec 9w REG 0,50 0 4489 /mnt/hgfs/share/file/6.txt a.out 35724 gec 10w REG 0,50 0 4490 /mnt/hgfs/share/file/7.txt a.out 35724 gec 11w REG 0,50 0 4491 /mnt/hgfs/share/file/8.txt a.out 35724 gec 12w REG 0,50 0 4492 /mnt/hgfs/share/file/9.txt a.out 35724 gec 13w REG 0,50 0 4493 /mnt/hgfs/share/file/10.txt a.out 35724 gec 14w REG 0,50 0 4494 /mnt/hgfs/share/file/11.txt