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1 /* Author: Makarius |
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2 |
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3 Bash process group invocation. |
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4 */ |
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5 |
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6 #include <stdlib.h> |
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7 #include <stdio.h> |
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8 #include <sys/types.h> |
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9 #include <unistd.h> |
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10 |
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11 |
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12 static void fail(const char *msg) |
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13 { |
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14 fprintf(stderr, "%s\n", msg); |
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15 exit(2); |
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16 } |
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17 |
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18 |
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19 int main(int argc, char *argv[]) |
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20 { |
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21 /* args */ |
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22 |
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23 if (argc != 3) { |
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24 fprintf(stderr, "Bad arguments\n"); |
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25 exit(1); |
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26 } |
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27 char *pid_name = argv[1]; |
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28 char *script = argv[2]; |
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29 |
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30 |
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31 /* report pid */ |
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32 |
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33 FILE *pid_file; |
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34 pid_file = fopen(pid_name, "w"); |
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35 if (pid_file == NULL) fail("Cannot open pid file"); |
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36 fprintf(pid_file, "%d", getpid()); |
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37 fclose(pid_file); |
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38 |
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39 |
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40 /* setsid */ |
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41 |
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42 if (getgid() == getpid()) fail("Cannot set session id"); |
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43 setsid(); |
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44 |
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45 |
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46 /* exec */ |
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47 |
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48 char *cmd_line[4]; |
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49 cmd_line[0] = "/bin/bash"; |
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50 cmd_line[1] = "-c"; |
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51 cmd_line[2] = script; |
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52 cmd_line[3] = NULL; |
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53 |
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54 execv("/bin/bash", cmd_line); |
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55 fail("Cannot exec process"); |
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56 } |
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57 |
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