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66 lines
1.6 KiB
66 lines
1.6 KiB
/* xsh_kill.c - xsh_kill */ |
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#include <xinu.h> |
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#include <string.h> |
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#include <stdio.h> |
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/*------------------------------------------------------------------------ |
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* xsh_kill - obtain and print the current month, day, year, and time |
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*------------------------------------------------------------------------ |
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*/ |
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shellcmd xsh_kill(int nargs, char *args[]) { |
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int32 retval; /* return value */ |
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pid32 pid; /* ID of process to kill */ |
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char ch; /* next character of argument */ |
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char *chptr; /* walks along argument string */ |
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/* Output info for '--help' argument */ |
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if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) { |
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printf("Usage: %s PID\n\n", args[0]); |
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printf("Description:\n"); |
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printf("\tterminates a process\n"); |
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printf("Options:\n"); |
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printf("\tPID \tthe ID of a process to terminate\n"); |
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printf("\t--help\tdisplay this help and exit\n"); |
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return OK; |
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} |
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/* Check argument count */ |
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if (nargs != 2) { |
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fprintf(stderr, "%s: incorrect argument\n", args[0]); |
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fprintf(stderr, "Try '%s --help' for more information\n", |
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args[0]); |
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return SYSERR; |
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} |
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/* compute process ID from argument string */ |
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chptr = args[1]; |
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ch = *chptr++; |
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pid = 0; |
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while(ch != NULLCH) { |
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if ( (ch < '0') || (ch > '9') ) { |
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fprintf(stderr, "%s: non-digit in process ID\n", |
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args[0]); |
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return 1; |
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} |
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pid = 10*pid + (ch - '0'); |
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ch = *chptr++; |
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} |
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if (pid == 0) { |
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fprintf(stderr, "%s: cannot kill the null process\n", |
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args[0]); |
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return 1; |
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} |
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retval = kill(pid); |
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if (retval == SYSERR) { |
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fprintf(stderr, "%s: cannot kill process %d\n", |
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args[0], pid); |
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return 1; |
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} |
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return 0; |
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}
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