49 lines
992 B
C
49 lines
992 B
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Author: SeongJae Park <sj@kernel.org>
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#pragma GCC diagnostic push
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#if __GNUC__ >= 11 && __GNUC_MINOR__ >= 1
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/* Ignore read(2) overflow and write(2) overread compile warnings */
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#pragma GCC diagnostic ignored "-Wstringop-overread"
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#pragma GCC diagnostic ignored "-Wstringop-overflow"
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#endif
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void write_read_with_huge_count(char *file)
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{
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int filedesc = open(file, O_RDWR);
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char buf[25];
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int ret;
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printf("%s %s\n", __func__, file);
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if (filedesc < 0) {
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fprintf(stderr, "failed opening %s\n", file);
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exit(1);
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}
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write(filedesc, "", 0xfffffffful);
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perror("after write: ");
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ret = read(filedesc, buf, 0xfffffffful);
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perror("after read: ");
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close(filedesc);
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}
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#pragma GCC diagnostic pop
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <file>\n", argv[0]);
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exit(1);
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}
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write_read_with_huge_count(argv[1]);
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return 0;
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}
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