30 lines
769 B
C
30 lines
769 B
C
#include "kernel/param.h"
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#include "kernel/types.h"
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#include "kernel/stat.h"
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#include "user/user.h"
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int
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main(int argc, char *argv[])
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{
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int i;
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//存储待跟踪程序的名称和参数
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char *nargv[MAXARG];
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//保证trace的参数不少于三个，并且跟踪的系统调用号在0-99之间
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if(argc < 3 || (argv[1][0] < '0' || argv[1][0] > '9')){
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fprintf(2, "Usage: %s mask command\n", argv[0]);
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exit(1);
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}
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//调用trace系统调用，传入待跟踪系统调用号
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if (trace(atoi(argv[1])) < 0) {
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fprintf(2, "%s: trace failed\n", argv[0]);
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exit(1);
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}
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//保存待跟踪程序的名称和参数
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for(i = 2; i < argc && i < MAXARG; i++){
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nargv[i-2] = argv[i];
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}
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//运行待跟踪的程序
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exec(nargv[0], nargv);
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exit(0);
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}
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