85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* Copyright (c) 2012, 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* kernelinfo.c
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* Prints a kernel information string.
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*/
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#include <sys/kernelinfo.h>
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#include <err.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char* argv[])
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{
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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default:
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errx(1, "unknown option -- '%c'", c);
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}
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}
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else
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errx(1, "unknown option: %s", arg);
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}
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size_t size = 32;
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char* buffer = (char*) malloc(size);
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if ( !buffer )
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err(1, "malloc");
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for ( int i = 1; i < argc; i++ )
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{
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while ( true )
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{
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ssize_t needed = kernelinfo(argv[i], buffer, size);
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if ( needed < 0 )
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{
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if ( errno == EINVAL )
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{
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warn("%s: No such kernel information", argv[i]);
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break;
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}
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err(1, "kernelinfo: %s", argv[i]);
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}
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if ( 0 < needed )
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{
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size = needed + 1;
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buffer = (char*) realloc(buffer, size);
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if ( !buffer )
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err(1, "malloc");
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continue;
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}
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printf("%s\n", buffer);
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break;
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}
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}
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if ( ferror(stdout) || fflush(stdout) == EOF )
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err(1, "stdout");
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return 0;
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}
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