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https://github.com/ibm-s390-linux/s390-tools.git
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Eduard Shishkin
b94566048b
Introduce a write simulation operation, which doesn't write actual data and just updates the current position in the file. This allows to emulate block lists for files located on raw devices (not formatted with a file system). This is used by the next patches in the series to implement '--dry-run' zipl option for dumps of all types (not only ngdumps). Introduce a 'misc file descriptor', which allows to mark individual files as "opened in a simulation mode". Whenever bulding a bootmap file, use either real write, or write simulation depending on the mode set in the 'misc file descriptor'. Tested-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Reviewed-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* s390-tools/zipl/include/misc.h
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* Miscellaneous helper functions.
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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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*/
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#ifndef MISC_H
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#define MISC_H
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#include <sys/types.h>
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#include <unistd.h>
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#include "zipl.h"
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struct misc_file_buffer {
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char* buffer;
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off_t pos;
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size_t length;
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};
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struct misc_fd {
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int fd;
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unsigned int simulate_write:1;
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};
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void* misc_malloc(size_t size);
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int misc_asprintf(char **out, const char *fmt, ...);
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void* misc_calloc(size_t n, size_t size);
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char* misc_strdup(const char* s);
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int misc_open_exclusive(const char* filename);
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int misc_read(int fd, void* buffer, size_t count);
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int misc_read_file(const char* filename, char** buffer, size_t* size,
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int nil_terminate);
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int misc_read_special_file(const char* filename, char** buffer, size_t* size,
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int nil_terminate);
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int misc_write(int fd, const void* data, size_t count);
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int misc_write_or_simulate(struct misc_fd *mfd, const void *data, size_t count);
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int misc_pwrite(int fd, void *buf, size_t size, off_t off);
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int misc_seek(int fd, off_t off);
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int misc_get_file_buffer(const char* filename,
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struct misc_file_buffer* buffer);
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void misc_free_file_buffer(struct misc_file_buffer* file);
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int misc_get_char(struct misc_file_buffer* file, off_t readahead);
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char* misc_make_path(char* dirname, char* filename);
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int misc_temp_dev(dev_t dev, int blockdev, char** devno);
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int misc_temp_dev_from_file(char* file, char** devno);
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void misc_free_temp_dev(char* device);
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void misc_free_temp_file(char *filename);
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int misc_check_writable_directory(const char* directory);
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int misc_check_readable_file(const char* filename);
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int misc_check_writable_device(const char* devno, int blockdev, int chardev);
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void misc_ebcdic_to_ascii(unsigned char *from, unsigned char *to);
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void misc_ascii_to_ebcdic(unsigned char *from, unsigned char *to);
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unsigned int misc_check_secure_boot(void);
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#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
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#endif /* not MISC_H */
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