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58eab6ff13
This test helper feeds 256kB of data at once to a single invocation of the write(2) system call, which may be too much for some platforms. Call our xwrite() wrapper that knows to honor MAX_IO_SIZE limit and cope with short writes due to EINTR instead, and die a bit more loudly by calling die_errno() when xwrite() indicates an error. Reported-by: Randall S. Becker <rsbecker@nexbridge.com> Helped-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
36 lines
690 B
C
36 lines
690 B
C
#include "test-tool.h"
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#include "git-compat-util.h"
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int cmd__genzeros(int argc, const char **argv)
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{
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/* static, so that it is NUL-initialized */
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static const char zeros[256 * 1024];
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intmax_t count;
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ssize_t n;
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if (argc > 2) {
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fprintf(stderr, "usage: %s [<count>]\n", argv[0]);
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return 1;
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}
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count = argc > 1 ? strtoimax(argv[1], NULL, 0) : -1;
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/* Writing out individual NUL bytes is slow... */
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while (count < 0)
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if (xwrite(1, zeros, ARRAY_SIZE(zeros)) < 0)
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die_errno("write error");
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while (count > 0) {
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n = xwrite(1, zeros,
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count < ARRAY_SIZE(zeros)
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? count : ARRAY_SIZE(zeros));
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if (n < 0)
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die_errno("write error");
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count -= n;
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}
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return 0;
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}
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