ff2b29d0ea
Summary: One cannot use mknod or mkfifo on user Android devices. This commit changes the use of pipe to a file to synchronize between the inferior and the test. Test Plan: dotest.py -P TestAttachDenied Reviewers: ovyalov, chaoren Reviewed By: chaoren Subscribers: tberghammer, lldb-commits Differential Revision: http://reviews.llvm.org/D9768 llvm-svn: 237328
106 lines
2.5 KiB
C++
106 lines
2.5 KiB
C++
#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/limits.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#if defined(PTRACE_ATTACH)
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#define ATTACH_REQUEST PTRACE_ATTACH
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#define DETACH_REQUEST PTRACE_DETACH
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#elif defined(PT_ATTACH)
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#define ATTACH_REQUEST PT_ATTACH
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#define DETACH_REQUEST PT_DETACH
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#else
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#error "Unsupported platform"
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#endif
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bool writePid (const char* file_name, const pid_t pid)
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{
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char tmp_file_name[PATH_MAX];
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strcpy(tmp_file_name, file_name);
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strcat(tmp_file_name, "_tmp");
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int fd = open (tmp_file_name, O_CREAT | O_WRONLY | O_TRUNC, S_IRUSR | S_IWUSR);
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if (fd == -1)
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{
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fprintf (stderr, "open(%s) failed: %s\n", tmp_file_name, strerror (errno));
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return false;
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}
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char buffer[64];
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snprintf (buffer, sizeof(buffer), "%ld", (long)pid);
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bool res = true;
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if (write (fd, buffer, strlen (buffer)) == -1)
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{
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fprintf (stderr, "write(%s) failed: %s\n", buffer, strerror (errno));
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res = false;
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}
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close (fd);
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if (rename (tmp_file_name, file_name) == -1)
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{
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fprintf (stderr, "rename(%s, %s) failed: %s\n", tmp_file_name, file_name, strerror (errno));
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res = false;
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}
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return res;
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}
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void sigterm_handler (int)
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{
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}
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int main (int argc, char const *argv[])
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{
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if (argc < 2)
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{
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fprintf (stderr, "invalid number of command line arguments\n");
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return 1;
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}
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const pid_t pid = fork ();
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if (pid == -1)
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{
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fprintf (stderr, "fork failed: %s\n", strerror (errno));
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return 1;
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}
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if (pid > 0)
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{
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// Make pause call to return when SIGTERM is received.
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signal (SIGTERM, sigterm_handler);
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if (ptrace (ATTACH_REQUEST, pid, NULL, 0) == -1)
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{
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fprintf (stderr, "ptrace(ATTACH) failed: %s\n", strerror (errno));
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}
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else
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{
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if (writePid (argv[1], pid))
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pause (); // Waiting for the debugger trying attach to the child.
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if (ptrace (DETACH_REQUEST, pid, NULL, 0) != 0)
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fprintf (stderr, "ptrace(DETACH) failed: %s\n", strerror (errno));
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}
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kill (pid, SIGTERM);
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int status = 0;
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if (waitpid (pid, &status, 0) == -1)
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fprintf (stderr, "waitpid failed: %s\n", strerror (errno));
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}
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else
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{
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// child inferior.
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pause ();
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}
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printf ("Exiting now\n");
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return 0;
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}
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