| File: | src/gnu/usr.bin/binutils/obj/gdb/conftest.c |
| Warning: | line 34, column 13 This function call is prohibited after a successful vfork |
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| 1 | #line 6483 "configure" | |||
| 2 | #include "confdefs.h" | |||
| 3 | /* Thanks to Paul Eggert for this test. */ | |||
| 4 | #include <stdio.h> | |||
| 5 | #include <sys/types.h> | |||
| 6 | #include <sys/stat.h> | |||
| 7 | #ifdef HAVE_UNISTD_H1 | |||
| 8 | #include <unistd.h> | |||
| 9 | #endif | |||
| 10 | #ifdef HAVE_VFORK_H | |||
| 11 | #include <vfork.h> | |||
| 12 | #endif | |||
| 13 | /* On some sparc systems, changes by the child to local and incoming | |||
| 14 | argument registers are propagated back to the parent. | |||
| 15 | The compiler is told about this with #include <vfork.h>, | |||
| 16 | but some compilers (e.g. gcc -O) don't grok <vfork.h>. | |||
| 17 | Test for this by using a static variable whose address | |||
| 18 | is put into a register that is clobbered by the vfork. */ | |||
| 19 | static | |||
| 20 | #ifdef __cplusplus | |||
| 21 | sparc_address_test (int arg) | |||
| 22 | #else | |||
| 23 | sparc_address_test (arg) int arg; | |||
| 24 | #endif | |||
| 25 | { | |||
| 26 | static pid_t child; | |||
| 27 | if (!child
| |||
| ||||
| 28 | child = vfork (); | |||
| 29 | if (child
| |||
| 30 | perror ("vfork"); | |||
| 31 | _exit(2); | |||
| 32 | } | |||
| 33 | if (!child
| |||
| 34 | arg = getpid(); | |||
| ||||
| 35 | write(-1, "", 0); | |||
| 36 | _exit (arg); | |||
| 37 | } | |||
| 38 | } | |||
| 39 | } | |||
| 40 | main() { | |||
| 41 | pid_t parent = getpid (); | |||
| 42 | pid_t child; | |||
| 43 | ||||
| 44 | sparc_address_test (); | |||
| 45 | ||||
| 46 | child = vfork (); | |||
| 47 | ||||
| 48 | if (child == 0) { | |||
| 49 | /* Here is another test for sparc vfork register problems. | |||
| 50 | This test uses lots of local variables, at least | |||
| 51 | as many local variables as main has allocated so far | |||
| 52 | including compiler temporaries. 4 locals are enough for | |||
| 53 | gcc 1.40.3 on a Solaris 4.1.3 sparc, but we use 8 to be safe. | |||
| 54 | A buggy compiler should reuse the register of parent | |||
| 55 | for one of the local variables, since it will think that | |||
| 56 | parent can't possibly be used any more in this routine. | |||
| 57 | Assigning to the local variable will thus munge parent | |||
| 58 | in the parent process. */ | |||
| 59 | pid_t | |||
| 60 | p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(), | |||
| 61 | p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid(); | |||
| 62 | /* Convince the compiler that p..p7 are live; otherwise, it might | |||
| 63 | use the same hardware register for all 8 local variables. */ | |||
| 64 | if (p != p1 || p != p2 || p != p3 || p != p4 | |||
| 65 | || p != p5 || p != p6 || p != p7) | |||
| 66 | _exit(1); | |||
| 67 | ||||
| 68 | /* On some systems (e.g. IRIX 3.3), | |||
| 69 | vfork doesn't separate parent from child file descriptors. | |||
| 70 | If the child closes a descriptor before it execs or exits, | |||
| 71 | this munges the parent's descriptor as well. | |||
| 72 | Test for this by closing stdout in the child. */ | |||
| 73 | _exit(close(fileno(stdout)(!__isthreaded ? (((&__sF[1]))->_file) : (fileno)((& __sF[1])))) != 0); | |||
| 74 | } else { | |||
| 75 | int status; | |||
| 76 | struct stat st; | |||
| 77 | ||||
| 78 | while (wait(&status) != child) | |||
| 79 | ; | |||
| 80 | exit( | |||
| 81 | /* Was there some problem with vforking? */ | |||
| 82 | child < 0 | |||
| 83 | ||||
| 84 | /* Did the child fail? (This shouldn't happen.) */ | |||
| 85 | || status | |||
| 86 | ||||
| 87 | /* Did the vfork/compiler bug occur? */ | |||
| 88 | || parent != getpid() | |||
| 89 | ||||
| 90 | /* Did the file descriptor bug occur? */ | |||
| 91 | || fstat(fileno(stdout)(!__isthreaded ? (((&__sF[1]))->_file) : (fileno)((& __sF[1]))), &st) != 0 | |||
| 92 | ); | |||
| 93 | } | |||
| 94 | } |