48 lines
982 B
C
48 lines
982 B
C
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <string.h>
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void show(int n)
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{
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for (int i = 0; i < n; i++)
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{
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// printf("%d 进程 -> %d\n", getpid(), i);
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char buf[32];
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sprintf(buf, "%d 进程 -> %d\n", getpid(), i);
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/*
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#define STDIN_FILENO 0 // Standard input.
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#define STDOUT_FILENO 1 // Standard output.
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#define STDERR_FILENO 2 // Standard error output.
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*/
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write(STDOUT_FILENO, buf, strlen(buf));
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sleep(1);
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}
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}
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int main()
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{
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for (int i = 0; i < 5; i++)
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{
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int pid = fork();
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if (pid == 0)
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{
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show(i + 1);
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_exit(0);
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}
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}
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while (1)
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{
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int status;
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int pid = waitpid(0, &status, WUNTRACED);
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if (pid == -1)
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{
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break;
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}
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printf("%d 子进程结束\n", pid);
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}
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return 0;
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}
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