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1acfb20cb3
Compiler warning about close(fd), add include file to fix. Signed-off-by: haoyixing <haoyixing@kuaishou.com> Co-authored-by: haoyixing <haoyixing@kuaishou.com>
158 lines
3.0 KiB
C
158 lines
3.0 KiB
C
/*
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FUSE fioclient: FUSE ioctl example client
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Copyright (C) 2008 SUSE Linux Products GmbH
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Copyright (C) 2008 Tejun Heo <teheo@suse.de>
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This program can be distributed under the terms of the GNU GPLv2.
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See the file COPYING.
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*/
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/** @file
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*
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* This program tests the cuse.c example file system.
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*
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* Example usage (assuming that /dev/foobar is a CUSE device provided
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* by the cuse.c example file system):
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*
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* $ cuse_client /dev/foobar s
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* 0
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*
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* $ echo "hello" | cuse_client /dev/foobar w 6
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* Writing 6 bytes
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* transferred 6 bytes (0 -> 6)
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*
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* $ cuse_client /dev/foobar s
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* 6
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*
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* $ cuse_client /dev/foobar r 10
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* hello
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* transferred 6 bytes (6 -> 6)
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*
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* Compiling this example
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*
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* gcc -Wall cuse_client.c -o cuse_client
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*
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* ## Source Code ##
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* \include cuse_client.c
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include "ioctl.h"
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const char *usage =
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"Usage: cuse_client FIOC_FILE COMMAND\n"
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"\n"
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"COMMANDS\n"
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" s [SIZE] : get size if SIZE is omitted, set size otherwise\n"
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" r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n"
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" w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\n"
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"\n";
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static int do_rw(int fd, int is_read, size_t size, off_t offset,
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size_t *prev_size, size_t *new_size)
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{
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struct fioc_rw_arg arg = { .offset = offset };
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ssize_t ret;
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arg.buf = calloc(1, size);
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if (!arg.buf) {
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fprintf(stderr, "failed to allocated %zu bytes\n", size);
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return -1;
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}
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if (is_read) {
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arg.size = size;
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ret = ioctl(fd, FIOC_READ, &arg);
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if (ret >= 0)
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fwrite(arg.buf, 1, ret, stdout);
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} else {
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arg.size = fread(arg.buf, 1, size, stdin);
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fprintf(stderr, "Writing %zu bytes\n", arg.size);
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ret = ioctl(fd, FIOC_WRITE, &arg);
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}
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if (ret >= 0) {
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*prev_size = arg.prev_size;
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*new_size = arg.new_size;
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} else
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perror("ioctl");
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free(arg.buf);
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return ret;
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}
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int main(int argc, char **argv)
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{
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size_t param[2] = { };
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size_t size, prev_size = 0, new_size = 0;
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char cmd;
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int fd, i, rc;
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if (argc < 3)
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goto usage;
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fd = open(argv[1], O_RDWR);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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cmd = tolower(argv[2][0]);
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argc -= 3;
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argv += 3;
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for (i = 0; i < argc; i++) {
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char *endp;
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param[i] = strtoul(argv[i], &endp, 0);
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if (endp == argv[i] || *endp != '\0')
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goto usage;
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}
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switch (cmd) {
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case 's':
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if (!argc) {
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if (ioctl(fd, FIOC_GET_SIZE, &size)) {
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perror("ioctl");
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goto error;
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}
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printf("%zu\n", size);
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} else {
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size = param[0];
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if (ioctl(fd, FIOC_SET_SIZE, &size)) {
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perror("ioctl");
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goto error;
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}
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}
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close(fd);
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return 0;
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case 'r':
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case 'w':
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rc = do_rw(fd, cmd == 'r', param[0], param[1],
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&prev_size, &new_size);
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if (rc < 0)
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goto error;
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fprintf(stderr, "transferred %d bytes (%zu -> %zu)\n",
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rc, prev_size, new_size);
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close(fd);
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return 0;
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}
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usage:
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fprintf(stderr, "%s", usage);
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return 1;
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error:
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close(fd);
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return 1;
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}
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