?? fork1.c
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#include <sys/types.h>#include "ourhdr.h"int glob = 6; /* external variable in initialized data */char buf[] = "a write to stdout\n";intmain(void){ int var; /* automatic variable on the stack */ pid_t pid; var = 88; if (write(STDOUT_FILENO, buf, sizeof(buf)-1) != sizeof(buf)-1) err_sys("write error"); printf("before fork\n"); /* we don't flush stdout */ if ( (pid = fork()) < 0) err_sys("fork error"); else if (pid == 0) { /* child */ glob++; /* modify variables */ var++; } else sleep(2); /* parent */ printf("pid = %d, glob = %d, var = %d\n", getpid(), glob, var); exit(0);}
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