67 lines
1020 B
C
67 lines
1020 B
C
#include <errno.h>
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#include <luna.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <unistd.h>
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void show_motd()
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{
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FILE* fp = fopen("/etc/motd", "r");
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if (!fp)
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{
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if (errno != ENOENT) { perror("fopen"); }
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return;
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}
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char buf[4096];
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size_t nread = fread(buf, sizeof(buf) - 1, 1, fp);
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if (ferror(fp))
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{
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perror("fread");
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fclose(fp);
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return;
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}
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buf[nread] = 0;
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puts(buf);
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fclose(fp);
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putchar('\n');
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}
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int main()
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{
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if (getpid() != 1)
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{
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fprintf(stderr, "init should be started as PID 1\n");
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return 1;
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}
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show_motd();
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msleep(200);
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pid_t child = fork();
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if (child < 0)
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{
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perror("fork");
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return 1;
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}
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if (child == 0)
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{
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char* argv[] = {"/bin/sh", NULL};
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execv(argv[0], argv);
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perror("execv");
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return 1;
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}
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pid_t result;
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for (;;)
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{
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result = wait(NULL);
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if (result == child) return 0;
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}
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}
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