lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* sigset_SIG_HOLD_bug.c [BZ #1951] */ |
| 2 | #include <errno.h> |
| 3 | #include <error.h> |
| 4 | #include <inttypes.h> |
| 5 | #include <signal.h> |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | #include <unistd.h> |
| 10 | #include <sys/types.h> |
| 11 | #include <sys/wait.h> |
| 12 | |
| 13 | #define TEST_SIG SIGINT |
| 14 | |
| 15 | |
| 16 | /* Print mask of blocked signals for this process */ |
| 17 | static void |
| 18 | printSigMask (const char *msg) |
| 19 | { |
| 20 | sigset_t currMask; |
| 21 | int sig; |
| 22 | int cnt; |
| 23 | |
| 24 | if (msg != NULL) |
| 25 | printf ("%s", msg); |
| 26 | |
| 27 | if (sigprocmask (SIG_BLOCK, NULL, &currMask) == -1) |
| 28 | error (1, errno, "sigaction"); |
| 29 | |
| 30 | cnt = 0; |
| 31 | for (sig = 1; sig < NSIG; sig++) |
| 32 | { |
| 33 | if (sigismember (&currMask, sig)) |
| 34 | { |
| 35 | cnt++; |
| 36 | printf ("\t\t%d (%s)\n", sig, strsignal (sig)); |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | if (cnt == 0) |
| 41 | printf ("\t\t<empty signal set>\n"); |
| 42 | } /* printSigMask */ |
| 43 | |
| 44 | static void |
| 45 | handler (int sig) |
| 46 | { |
| 47 | printf ("Caught signal %d\n", sig); |
| 48 | printSigMask ("Signal mask in handler\n"); |
| 49 | printf ("Handler returning\n"); |
| 50 | _exit (1); |
| 51 | } /* handler */ |
| 52 | |
| 53 | static void |
| 54 | printDisposition (sighandler_t disp) |
| 55 | { |
| 56 | if (disp == SIG_HOLD) |
| 57 | printf ("SIG_HOLD"); |
| 58 | else if (disp == SIG_DFL) |
| 59 | printf ("SIG_DFL"); |
| 60 | else if (disp == SIG_IGN) |
| 61 | printf ("SIG_IGN"); |
| 62 | else |
| 63 | printf ("handled at %" PRIxPTR, (uintptr_t) disp); |
| 64 | } /* printDisposition */ |
| 65 | |
| 66 | static int |
| 67 | returnTest1 (void) |
| 68 | { |
| 69 | sighandler_t prev; |
| 70 | |
| 71 | printf ("===== TEST 1 =====\n"); |
| 72 | printf ("Blocking signal with sighold()\n"); |
| 73 | if (sighold (TEST_SIG) == -1) |
| 74 | error (1, errno, "sighold"); |
| 75 | printSigMask ("Signal mask after sighold()\n"); |
| 76 | |
| 77 | printf ("About to use sigset() to establish handler\n"); |
| 78 | prev = sigset (TEST_SIG, handler); |
| 79 | if (prev == SIG_ERR) |
| 80 | error(1, errno, "sigset"); |
| 81 | |
| 82 | printf ("Previous disposition: "); |
| 83 | printDisposition (prev); |
| 84 | printf (" (should be SIG_HOLD)\n"); |
| 85 | if (prev != SIG_HOLD) |
| 86 | { |
| 87 | printf("TEST FAILED!!!\n"); |
| 88 | return 1; |
| 89 | } |
| 90 | return 0; |
| 91 | } /* returnTest1 */ |
| 92 | |
| 93 | static int |
| 94 | returnTest2 (void) |
| 95 | { |
| 96 | sighandler_t prev; |
| 97 | |
| 98 | printf ("\n===== TEST 2 =====\n"); |
| 99 | |
| 100 | printf ("About to use sigset() to set SIG_HOLD\n"); |
| 101 | prev = sigset (TEST_SIG, SIG_HOLD); |
| 102 | if (prev == SIG_ERR) |
| 103 | error (1, errno, "sigset"); |
| 104 | |
| 105 | printf ("Previous disposition: "); |
| 106 | printDisposition (prev); |
| 107 | printf (" (should be SIG_DFL)\n"); |
| 108 | if (prev != SIG_DFL) |
| 109 | { |
| 110 | printf("TEST FAILED!!!\n"); |
| 111 | return 1; |
| 112 | } |
| 113 | return 0; |
| 114 | } /* returnTest2 */ |
| 115 | |
| 116 | static int |
| 117 | returnTest3 (void) |
| 118 | { |
| 119 | sighandler_t prev; |
| 120 | |
| 121 | printf ("\n===== TEST 3 =====\n"); |
| 122 | |
| 123 | printf ("About to use sigset() to set SIG_HOLD\n"); |
| 124 | prev = sigset (TEST_SIG, SIG_HOLD); |
| 125 | if (prev == SIG_ERR) |
| 126 | error (1, errno, "sigset"); |
| 127 | |
| 128 | printf ("About to use sigset() to set SIG_HOLD (again)\n"); |
| 129 | prev = sigset (TEST_SIG, SIG_HOLD); |
| 130 | if (prev == SIG_ERR) |
| 131 | error (1, errno, "sigset"); |
| 132 | |
| 133 | printf ("Previous disposition: "); |
| 134 | printDisposition (prev); |
| 135 | printf (" (should be SIG_HOLD)\n"); |
| 136 | if (prev != SIG_HOLD) |
| 137 | { |
| 138 | printf("TEST FAILED!!!\n"); |
| 139 | return 1; |
| 140 | } |
| 141 | return 0; |
| 142 | } /* returnTest3 */ |
| 143 | |
| 144 | int |
| 145 | main (int argc, char *argv[]) |
| 146 | { |
| 147 | pid_t childPid; |
| 148 | |
| 149 | childPid = fork(); |
| 150 | if (childPid == -1) |
| 151 | error (1, errno, "fork"); |
| 152 | |
| 153 | if (childPid == 0) |
| 154 | exit (returnTest1 ()); |
| 155 | |
| 156 | int status; |
| 157 | if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid) |
| 158 | error (1, errno, "waitpid"); |
| 159 | int result = !WIFEXITED (status) || WEXITSTATUS (status) != 0; |
| 160 | |
| 161 | childPid = fork(); |
| 162 | if (childPid == -1) |
| 163 | error (1, errno, "fork"); |
| 164 | |
| 165 | if (childPid == 0) |
| 166 | exit (returnTest2 ()); |
| 167 | |
| 168 | if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid) |
| 169 | error (1, errno, "waitpid"); |
| 170 | result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0; |
| 171 | |
| 172 | childPid = fork(); |
| 173 | if (childPid == -1) |
| 174 | error (1, errno, "fork"); |
| 175 | |
| 176 | if (childPid == 0) |
| 177 | exit (returnTest3 ()); |
| 178 | |
| 179 | if (TEMP_FAILURE_RETRY (waitpid (childPid, &status, 0)) != childPid) |
| 180 | error (1, errno, "waitpid"); |
| 181 | result |= !WIFEXITED (status) || WEXITSTATUS (status) != 0; |
| 182 | |
| 183 | return result; |
| 184 | } /* main */ |