82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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kernelinfo.cpp
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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 <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <error.h>
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void usage(const char* argv0)
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{
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printf("usage: %s <REQUEST> ...\n", argv0);
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printf("Prints a kernel information string.\n");
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printf("example: %s name\n", argv0);
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printf("example: %s version\n", argv0);
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printf("example: %s builddate\n", argv0);
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printf("example: %s buildtime\n", argv0);
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}
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void help(const char* argv0)
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{
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usage(argv0);
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}
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void version(const char* argv0)
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{
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usage(argv0);
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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if ( argc < 2 ) { usage(argv0); return 0; }
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for ( int i = 1; i < argc; i++ )
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{
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if ( argv[i][0] != '-' ) { continue; }
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if ( strcmp(argv[i], "--usage") == 0 ) { usage(argv0); return 0; }
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if ( strcmp(argv[i], "--help") == 0 ) { help(argv0); return 0; }
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if ( strcmp(argv[i], "--version") == 0 ) { version(argv0); return 0; }
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fprintf(stderr, "%s: unknown option: %s\n", argv0, argv[i]);
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return 1;
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}
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size_t bufsize = 32;
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char* buf = (char*) malloc(bufsize);
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if ( !buf ) { perror("malloc"); return 1; }
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for ( int i = 1; i < argc; i++ )
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{
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retry:
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ssize_t ret = kernelinfo(argv[i], buf, bufsize);
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if ( ret < 0 ) { error(1, errno, "kernelinfo(\"%s\")", argv[i]); }
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if ( ret )
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{
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buf = (char*) realloc(buf, ret);
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if ( !buf ) { perror("realloc"); return 1; }
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bufsize = ret;
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goto retry;
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}
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printf("%s\n", buf);
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}
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return 0;
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}
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