44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
#include <sys/types.h>
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#include <sys/uio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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int main(int argc, const char* argv[]) {
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int fd, len;
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char read_buf[128] = {0};
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// read
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if ((fd = open("/host/hostfs/sample.txt", O_RDONLY)) < 0) {
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printf("ERROR: failed to open a file for read\n");
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return -1;
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}
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if ((len = read(fd, read_buf, sizeof(read_buf) - 1)) <= 0) {
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printf("ERROR: failed to read from the file\n");
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return -1;
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}
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close(fd);
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if (strcmp("HostFS works!", read_buf) != 0) {
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printf("ERROR: the message read from the file is not expected\n");
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return -1;
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}
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printf("Read file from hostfs successfully!\n");
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// write
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if ((fd = open("/host/hostfs/test_write.txt", O_WRONLY | O_CREAT)) < 0) {
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printf("ERROR: failed to open a file for write\n");
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return -1;
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}
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const char WRITE_STR[] = "Write to hostfs successfully!";
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if ((len = write(fd, WRITE_STR, sizeof(WRITE_STR))) <= 0) {
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printf("ERROR: failed to write to the file\n");
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return -1;
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}
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close(fd);
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printf("Write file to hostfs finished. Please check its content.\n");
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return 0;
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}
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