41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main(int argc, char **argv)
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{
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const char *path = "/zvfs/func_test.dat";
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if (argc > 2 && strcmp(argv[1], "-f") == 0) path = argv[2];
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setenv("ZVFS_ROOT", "/zvfs", 0);
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printf("open: %s\n", path);
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int fd = open(path, O_CREAT|O_RDWR, 0644);
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if (fd < 0) { perror("open"); return 1; }
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const char *msg = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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ssize_t w = write(fd, msg, strlen(msg));
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if (w < 0) { perror("write"); return 2; }
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printf("write: %zd\n", w);
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/* Rewind by closing and reopening for read */
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close(fd);
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fd = open(path, O_RDONLY);
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if (fd < 0) { perror("open R"); return 3; }
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char buf[256]; memset(buf, 0, sizeof(buf));
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ssize_t r = read(fd, buf, sizeof(buf));
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if (r < 0) { perror("read"); return 4; }
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printf("read: %zd bytes: %.*s\n", r, (int)r, buf);
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close(fd);
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if (unlink(path) != 0) { perror("unlink"); return 5; }
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printf("unlink: ok\n");
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return 0;
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}
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