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e9deec4c62
It is unusual to write the file output from a tool to stdout. Therefore add a positional argument to the zgetdump convert action where the output file can be specified. If no positional argument is given the output is written to stdout as before and therefore there is no change in the default behavior. If the file output already exists an error is returned. The reason for this is to avoid the situation where an existing dump is accidentally overwritten by the user. Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
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* zgetdump - Tool for copying and converting System z dumps
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*
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* Write dump to the file descriptor (fd)
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*
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* Copyright IBM Corp. 2001, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include "zg.h"
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#include "dfi.h"
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#include "dfo.h"
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#include "output.h"
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int write_dump(int fd)
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{
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const u64 output_size = dfo_size();
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char buf[8UL * PAGE_SIZE];
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u64 written = 0;
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if (fd < 0)
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ERR_EXIT("fd must be a valid file descriptor");
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if (!dfi_feat_copy())
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ERR_EXIT("Copying not possible for %s dumps", dfi_name());
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STDERR("Format Info:\n");
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STDERR(" Source: %s\n", dfi_name());
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STDERR(" Target: %s\n", dfo_name());
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STDERR("\n");
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zg_progress_init("Copying dump", output_size);
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while (written != output_size) {
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ssize_t rc;
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u64 cnt;
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cnt = dfo_read(buf, sizeof(buf));
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rc = write(fd, buf, cnt);
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if (rc == -1)
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ERR_EXIT_ERRNO("Error: Write failed");
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if (rc != (ssize_t) cnt)
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ERR_EXIT("Error: Could not write full block");
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written += cnt;
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zg_progress(written);
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};
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STDERR("\n");
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STDERR("Success: Dump has been copied\n");
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return 0;
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}
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