45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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int
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main ()
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{
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int child, status;
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printf("Parent $PATH = %s\n", getenv("PATH"));
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printf("Parent $HOME = %s\n", getenv("HOME"));
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printf("Parent $USER = %s\n", getenv("USER"));
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printf("Parent $IFS = %s\n", getenv("IFS"));
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printf("Parent $ROOT = %s\n", getenv("ROOT"));
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printf("Parent $TEST = %s\n", getenv("TEST"));
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putenv("TEST=value");
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printf("Parent putenv(TEST=value); now $TEST = %s\n", getenv("TEST"));
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fflush(stdout);
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switch(child = fork()){
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case 0:
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printf("Child $PATH = %s\n", getenv("PATH"));
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printf("Child $HOME = %s\n", getenv("HOME"));
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printf("Child $USER = %s\n", getenv("USER"));
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printf("Child $IFS = %s\n", getenv("IFS"));
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printf("Child $ROOT = %s\n", getenv("ROOT"));
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printf("Child $TEST = %s\n", getenv("TEST"));
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exit(0);
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case -1:
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printf("FAIL: fork\n");
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return 1;
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default:
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wait(&status);
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break;
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}
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unsetenv("TEST");
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printf("Parent unsetenv(TEST); now $TEST = %s\n", getenv("TEST"));
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if(status)
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printf("FAIL: child returned %d\n", status);
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exit(status);
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}
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