60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
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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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