1 /* This file is used to test the 'catch syscall' feature on GDB. 2 3 Please, if you are going to edit this file DO NOT change the syscalls 4 being called (nor the order of them). If you really must do this, then 5 take a look at catch-syscall.exp and modify there too. 6 7 Written by Sergio Durigan Junior <sergiodj@linux.vnet.ibm.com> 8 September, 2008 */ 9 10 #include <unistd.h> 11 #include <sys/syscall.h> 12 #include <fcntl.h> 13 #include <sys/stat.h> 14 #include <sched.h> 15 16 /* These are the syscalls numbers used by the test. */ 17 18 int close_syscall = SYS_close; 19 int chroot_syscall = SYS_chroot; 20 /* GDB had a bug where it couldn't catch syscall number 0 (PR 16297). 21 In most GNU/Linux architectures, syscall number 0 is 22 restart_syscall, which can't be called from userspace. However, 23 the "read" syscall is zero on x86_64. */ 24 int read_syscall = SYS_read; 25 #ifdef SYS_pipe 26 int pipe_syscall = SYS_pipe; 27 #else 28 int pipe2_syscall = SYS_pipe2; 29 #endif 30 int write_syscall = SYS_write; 31 #if defined(__arm__) 32 /* Although 123456789 is an illegal syscall umber on arm linux, kernel 33 sends SIGILL rather than returns -ENOSYS. However, arm linux kernel 34 returns -ENOSYS if syscall number is within 0xf0001..0xf07ff, so we 35 can use 0xf07ff for unknown_syscall in test. */ 36 int unknown_syscall = 0x0f07ff; 37 #else 38 int unknown_syscall = 123456789; 39 #endif 40 int exit_group_syscall = SYS_exit_group; 41 42 /* Set by the test when it wants execve. */ 43 int do_execve = 0; 44 45 int 46 main (int argc, char *const argv[]) 47 { 48 int fd[2]; 49 char buf1[2] = "a"; 50 char buf2[2]; 51 52 /* Test a simple self-exec, but only on request. */ 53 if (do_execve) 54 execv (*argv, argv); 55 56 /* A close() with a wrong argument. We are only 57 interested in the syscall. */ 58 close (-1); 59 60 chroot ("."); 61 62 pipe (fd); 63 64 write (fd[1], buf1, sizeof (buf1)); 65 read (fd[0], buf2, sizeof (buf2)); 66 67 /* Test vfork-event interactions. Child exits immediately. 68 (Plain fork won't work on no-mmu kernel configurations.) */ 69 if (vfork () == 0) 70 _exit (0); 71 72 /* Trigger an intentional ENOSYS. */ 73 syscall (unknown_syscall); 74 75 /* The last syscall. Do not change this. */ 76 _exit (0); 77 } 78