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/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/wait.h>
int main(int argc, char *argv[])
{
pid_t pid = fork();
const char *path, *cmd;
int fd_in[2], fd_out[2], fd_log, status;
if (argc < 2)
i_fatal("Usage: gdbhelper <program> [<args>]");
switch (pid) {
case 1:
i_fatal("fork() failed: %m");
case 0:
/* child */
(void)execvp(argv[1], argv+1);
i_fatal("execvp(%s) failed: %m", argv[1]);
default:
if (pipe(fd_in) < 0 || pipe(fd_out) < 0)
i_fatal("pipe() failed: %m");
cmd = "handle SIGPIPE nostop\n"
"handle SIGALRM nostop\n"
"handle SIG32 nostop\n"
"cont\n"
"bt full\n"
"quit\n";
if (write(fd_in[1], cmd, strlen(cmd)) < 0)
i_fatal("write() failed: %m");
if (dup2(fd_in[0], 0) < 0 ||
dup2(fd_out[1], 1) < 0 ||
dup2(fd_out[1], 2) < 0)
i_fatal("dup2() failed: %m");
cmd = t_strdup_printf("gdb %s %s", argv[1], dec2str(pid));
if (system(cmd) < 0)
i_fatal("system() failed: %m");
if (wait(&status) < 0)
i_fatal("wait() failed: %m");
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
char buf[1024];
ssize_t ret;
path = t_strdup_printf("/tmp/gdbhelper.%s.%s",
dec2str(time(NULL)),
dec2str(pid));
fd_log = open(path, O_CREAT | O_WRONLY, 0600);
if (fd_log < 0)
i_fatal("open(%s) failed: %m", path);
while ((ret = read(fd_out[0], buf, sizeof(buf))) > 0) {
if (write(fd_log, buf, ret) < 0)
i_fatal("write(%s) failed: %m", path);
}
if (ret < 0)
i_fatal("read(pipe) failed: %m");
i_close_fd(&fd_log);
}
}
return 0;
}
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