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 #endif 28 #ifdef SYS_pipe2 29 int pipe2_syscall = SYS_pipe2; 30 #endif 31 int write_syscall = SYS_write; 32 #if defined(__arm__) 33 /* Although 123456789 is an illegal syscall umber on arm linux, kernel 34 sends SIGILL rather than returns -ENOSYS. However, arm linux kernel 35 returns -ENOSYS if syscall number is within 0xf0001..0xf07ff, so we 36 can use 0xf07ff for unknown_syscall in test. */ 37 int unknown_syscall = 0x0f07ff; 38 #else 39 int unknown_syscall = 123456789; 40 #endif 41 int exit_group_syscall = SYS_exit_group; 42 43 /* Set by the test when it wants execve. */ 44 int do_execve = 0; 45 46 int 47 main (int argc, char *const argv[]) 48 { 49 int fd[2]; 50 char buf1[2] = "a"; 51 char buf2[2]; 52 53 /* Test a simple self-exec, but only on request. */ 54 if (do_execve) 55 execv (*argv, argv); 56 57 /* A close() with a wrong argument. We are only 58 interested in the syscall. */ 59 close (-1); 60 61 chroot ("."); 62 63 pipe (fd); 64 65 write (fd[1], buf1, sizeof (buf1)); 66 read (fd[0], buf2, sizeof (buf2)); 67 68 /* Test vfork-event interactions. Child exits immediately. 69 (Plain fork won't work on no-mmu kernel configurations.) */ 70 if (vfork () == 0) 71 _exit (0); 72 73 /* Trigger an intentional ENOSYS. */ 74 syscall (unknown_syscall); 75 76 /* The last syscall. Do not change this. */ 77 _exit (0); 78 } 79