1  /*
       2   * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2016-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include <stdio.h>
      10  #include <fcntl.h>
      11  #include <unistd.h>
      12  
      13  #include <linux/types.h>
      14  #include <asm/statfs.h>
      15  
      16  #include "xlat.h"
      17  #include "xlat/fsmagic.h"
      18  #include "xlat/statfs_flags.h"
      19  
      20  #define PRINT_NUM(arg)							\
      21  	do {								\
      22  		if (sizeof(b->arg) == sizeof(int))			\
      23  			printf(", %s=%u", #arg,				\
      24  			       (unsigned int) b->arg);			\
      25  		else if (sizeof(b->arg) == sizeof(long))		\
      26  			printf(", %s=%lu", #arg,			\
      27  			       (unsigned long) b->arg);			\
      28  		else							\
      29  			printf(", %s=%llu", #arg,			\
      30  			       (unsigned long long) b->arg);		\
      31  	} while (0)
      32  
      33  static void
      34  print_statfs_type(const char *const prefix, const unsigned int magic)
      35  {
      36  	fputs(prefix, stdout);
      37  	for (unsigned int i = 0; i < fsmagic->size; ++i)
      38  		if (magic == fsmagic->data[i].val) {
      39  			fputs(fsmagic->data[i].str, stdout);
      40  			return;
      41  		}
      42  	printf("%#x", magic);
      43  }
      44  
      45  static void
      46  print_statfs(const char *const sample, const char *magic_str)
      47  {
      48  	int fd = open(sample, O_RDONLY);
      49  	if (fd < 0)
      50  		perror_msg_and_skip("open: %s", sample);
      51  
      52  	TAIL_ALLOC_OBJECT_CONST_PTR(STRUCT_STATFS, b);
      53  	long rc = SYSCALL_INVOKE(sample, fd, b, sizeof(*b));
      54  	if (rc)
      55  		perror_msg_and_skip(SYSCALL_NAME);
      56  
      57  	PRINT_SYSCALL_HEADER(sample, fd, sizeof(*b));
      58  	if (magic_str)
      59  		printf("{f_type=%s", magic_str);
      60  	else
      61  		print_statfs_type("{f_type=", b->f_type);
      62  	PRINT_NUM(f_bsize);
      63  	PRINT_NUM(f_blocks);
      64  	PRINT_NUM(f_bfree);
      65  	PRINT_NUM(f_bavail);
      66  	PRINT_NUM(f_files);
      67  	PRINT_NUM(f_ffree);
      68  #ifdef PRINT_F_FSID
      69  	printf(", f_fsid={val=[%#llx, %#llx]}",
      70  	       zero_extend_signed_to_ull(b->PRINT_F_FSID[0]),
      71  	       zero_extend_signed_to_ull(b->PRINT_F_FSID[1]));
      72  #endif
      73  	PRINT_NUM(f_namelen);
      74  #ifdef PRINT_F_FRSIZE
      75  	PRINT_NUM(f_frsize);
      76  #endif
      77  #ifdef PRINT_F_FLAGS
      78  	if (b->f_flags & ST_VALID) {
      79  		printf(", f_flags=");
      80  		printflags(statfs_flags, b->f_flags, "ST_???");
      81  	}
      82  #endif
      83  	printf("}) = 0\n");
      84  }
      85  
      86  int
      87  main(void)
      88  {
      89  	print_statfs("/proc/self/status", "PROC_SUPER_MAGIC");
      90  
      91  	print_statfs(".", NULL);
      92  
      93  	long rc = SYSCALL_INVOKE("", -1, 0, sizeof(STRUCT_STATFS));
      94  	const char *errstr = sprintrc(rc);
      95  	PRINT_SYSCALL_HEADER("", -1, sizeof(STRUCT_STATFS));
      96  	printf("NULL) = %s\n", errstr);
      97  
      98  #ifdef CHECK_ODD_SIZE
      99  	const unsigned long addr = (unsigned long) 0xfacefeeddeadbeefULL;
     100  	rc = SYSCALL_INVOKE("", -1, addr, sizeof(STRUCT_STATFS) + 1);
     101  	errstr = sprintrc(rc);
     102  	PRINT_SYSCALL_HEADER("", -1, sizeof(STRUCT_STATFS) + 1);
     103  	printf("%#lx) = %s\n", addr, errstr);
     104  #endif
     105  
     106  	puts("+++ exited with 0 +++");
     107  	return 0;
     108  }