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60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#if 0 && defined _WIN32
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#include <windows.h>
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static int ftruncate(int fd, uint64_t offset) {
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HANDLE h = (HANDLE) _get_osfhandle(fd);
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printf("%s:%d %p\n", __FILE__, __LINE__, h); fflush(stdout);
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if (h == INVALID_HANDLE_VALUE)
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return -1;
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int r = _lseeki64(fd, 0, SEEK_SET);
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printf("%s:%d %d\n", __FILE__, __LINE__, r); fflush(stdout);
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if (r != 0)
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return -2;
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BOOL b = SetEndOfFile(h);
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printf("%s:%d %d\n", __FILE__, __LINE__, b); fflush(stdout);
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if (!b)
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return -3;
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return 0;
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}
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#endif
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int main(void) {
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int r;
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int fd;
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fd = open("test-file-truncate", O_CREAT+O_RDWR+O_TRUNC, S_IREAD+S_IWRITE);
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assert(fd != -1);
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int i;
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for (i=0; i<32; i++) {
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char junk[4096];
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memset(junk, 0, sizeof junk);
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r = write(fd, junk, sizeof junk);
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assert(r == sizeof junk);
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}
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struct stat filestat;
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r = fstat(fd, &filestat);
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assert(r == 0);
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printf("orig size %lu\n", (unsigned long) filestat.st_size); fflush(stdout);
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r = ftruncate(fd, 0);
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assert(r == 0);
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r = fstat(fd, &filestat);
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assert(r == 0);
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printf("truncated size %lu\n", (unsigned long) filestat.st_size); fflush(stdout);
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assert(filestat.st_size == 0);
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return 0;
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}
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