51 lines
1.5 KiB
C
Executable File
51 lines
1.5 KiB
C
Executable File
#include "test_utils.h"
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static int test_dual_open_same_file(const char *path)
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{
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printf("\n=== test_dual_open_same_file ===\n");
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int fd_init = open(path, O_CREAT | O_RDWR | O_TRUNC, 0644);
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if (fd_init < 0) { perror("open init"); return 1; }
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const char *init = "0123456789";
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if (write(fd_init, init, 10) != 10) { perror("write init"); return 2; }
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close(fd_init);
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int fd_w = open(path, O_WRONLY);
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if (fd_w < 0) { perror("open W"); return 3; }
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int fd_r = open(path, O_RDONLY);
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if (fd_r < 0) { perror("open R"); return 4; }
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printf("fd_w=%d fd_r=%d\n", fd_w, fd_r);
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if (write(fd_w, "HELLO", 5) != 5) { perror("write"); return 5; }
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printf("write via fd_w: HELLO (overwrite first 5 bytes)\n");
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char buf[32] = {0};
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lseek(fd_r, 0, SEEK_SET);
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ssize_t r = read(fd_r, buf, sizeof(buf));
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printf("read via fd_r: %zd bytes: %.*s (expect: HELLO56789)\n", r, (int)r, buf);
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lseek(fd_w, 0, SEEK_END);
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if (write(fd_w, "!!!", 3) != 3) { perror("write append"); return 6; }
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printf("write append via fd_w: !!!\n");
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lseek(fd_r, 10, SEEK_SET);
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memset(buf, 0, sizeof(buf));
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r = read(fd_r, buf, sizeof(buf));
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printf("read appended via fd_r: %zd bytes: %.*s (expect: !!!)\n", r, (int)r, buf);
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close(fd_w);
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close(fd_r);
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unlink(path);
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return 0;
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}
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int main(int argc, char **argv)
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{
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char path[PATH_MAX];
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make_path(path, sizeof(path), argc >= 2 ? argv[1] : NULL, "file.dat");
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int rc = test_dual_open_same_file(path);
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return report_result("test_dual_open_same_file", rc);
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}
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