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121 lines
2.4 KiB
121 lines
2.4 KiB
#include<stdio.h>
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#include<unistd.h>
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#include<err.h>
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#include<sys/socket.h>
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#include<sys/wait.h>
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#include<netinet/in.h>
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static ulong nowus()
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{
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struct timeval t;
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if (gettimeofday(&t, NULL))
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errx(-1, "gettimeofday");
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return t.tv_sec * 1000000 + t.tv_usec;
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}
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static void profdump(void)
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{
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int fd = open("/pc.sh", O_RDONLY);
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if (fd == -1)
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err(-1, "open");
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if (dup2(fd, 0) == -1)
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err(-1, "dup");
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close(fd);
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char * const args[] = {"/bin/lsh", NULL};
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execv(args[0], args);
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err(-1, "exec");
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}
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static void forkwait(void (*f)(void))
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{
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switch (fork()) {
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case -1:
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err(-1, "fork");
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case 0:
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f();
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errx(-1, "child returned");
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}
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int status;
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if (wait(&status) == -1)
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err(-1, "wait");
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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printf("child failed\n");
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}
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static void req(int s)
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{
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if (dup2(s, 0) == -1)
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err(-1, "dup2");
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if (dup2(s, 1) == -1)
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err(-1, "dup2");
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if (close(s) == -1)
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err(-1, "close");
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char *args[] = {"./bin/fcgi", NULL};
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execv(args[0], args);
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err(-1, "execv");
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}
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int main(int argc, char **argv)
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{
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int s = socket(AF_INET, SOCK_STREAM, 0);
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if (s == -1)
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err(-1, "socket");
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int prof = 1;
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if (argc != 1) {
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printf("profiling\n");
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prof = 0;
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}
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struct sockaddr_in sin;
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int lport = 8080;
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sin.sin_family = AF_INET;
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sin.sin_port = htons(lport);
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sin.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == -1)
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err(-1, "bind");
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if (listen(s, 8) == -1)
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err(-1, "listen");
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fprintf(stderr, "listen on %d\n", lport);
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srand(time(NULL));
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ulong st = nowus();
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for (;;) {
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if (prof) {
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if (sys_prof(PROF_SAMPLE, PROF_EV_UNHALTED_CORE_CYCLES,
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//PROF_EVF_OS | PROF_EVF_USR | PROF_EVF_BACKTRACE,
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PROF_EVF_OS | PROF_EVF_USR,
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2800/2) == -1)
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err(-1, "sysprof");
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}
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socklen_t slen = sizeof(sin);
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int fd = accept(s, (struct sockaddr *)&sin, &slen);
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if (fd == -1)
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err(-1, "accept");
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pid_t c = fork();
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if (c == -1)
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err(-1, "fork");
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if (!c)
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req(fd);
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if (close(fd) == -1)
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err(-1, "close");
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int status;
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if (wait(&status) != c)
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err(-1, "wait");
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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errx(-1, "child failed");
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if (prof) {
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if (sys_prof(PROF_SAMPLE | PROF_DISABLE, 0, 0, 0) == -1)
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err(-1, "sysprof");
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}
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long end = nowus();
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long elap = end - st;
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st = end;
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if (elap >= 1000 && (rand() % 10000) < 1000) {
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printf("GOT PROFILE for %ldus\n", elap);
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printf("WAIT FOR DUMP...\n");
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forkwait(profdump);
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st = nowus();
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}
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}
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}
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