1 /* 2 * Copyright (c) 2002-2003, Intel Corporation. All rights reserved. 3 * Created by: salwan.searty REMOVE-THIS AT intel DOT com 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 * 8 * Updated: 21.06.2011 Peter W. Morreale <pmorreale (at) novell.com> 9 * 10 * Steps: 11 * - Register for myhandler to be called when SIGTOTEST is called, and make 12 * sure SA_SIGINFO is set. 13 * - Block signal SIGTOTEST from the process. 14 * - Using sysconf(), check to see if there is a limit on number of queued 15 * signals that are pending. If there isn't a limit (i.e. sysconf returned 16 * -1), then this test is not applicable to the system's implementation, 17 * and thus we should pass it. 18 * - Using sigqueue(), send to the current process a number of instances 19 * (of SIGTOTEST) equal to the limit that sysconf() returned. 20 * - Send one more instance of SIGTOTEST and verify that sigqueue returns 21 * -1 and sets errno to [EAGAIN] 22 * 23 */ 24 25 #define SIGTOTEST SIGRTMIN 26 27 #include <signal.h> 28 #include <stdio.h> 29 #include <unistd.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <errno.h> 33 #include <sys/types.h> 34 #include <pwd.h> 35 #include "posixtest.h" 36 37 #define MAX_ATTEMPTS 10000 38 39 static int reset_uid(void) 40 { 41 uid_t uid; 42 43 if (getuid()) 44 return 0; 45 46 /* Search for an unused uid */ 47 for (uid = 0; uid < MAX_ATTEMPTS; uid++) { 48 if (!getpwuid(uid) && !setuid(uid)) 49 return 0; 50 } 51 52 printf("Failed: No unused uid's in %d attempts\n", MAX_ATTEMPTS); 53 return -1; 54 } 55 56 int main(void) 57 { 58 int pid = getpid(); 59 int i; 60 long syslimit; 61 int rc; 62 union sigval value; 63 64 value.sival_int = 0; /* 0 is just an arbitrary value */ 65 pid = getpid(); 66 67 sighold(SIGTOTEST); 68 69 rc = reset_uid(); 70 if (rc) 71 return PTS_UNRESOLVED; 72 73 /* 74 * Get system limit. Note that this limit is optional. 75 */ 76 syslimit = sysconf(_SC_SIGQUEUE_MAX); 77 if (syslimit < 0) 78 goto done; 79 80 for (i = 0; i < syslimit; i++) { 81 if (sigqueue(pid, SIGTOTEST, value) != 0) { 82 printf("Failed: sigqueue on %d of %d max, errno: %s\n", 83 i, syslimit, strerror(errno)); 84 return PTS_UNRESOLVED; 85 } 86 } 87 88 /* 89 * Enqueue one more, needs to fail with EAGAIN 90 */ 91 rc = sigqueue(pid, SIGTOTEST, value); 92 if (!(rc == -1 && errno == EAGAIN)) { 93 printf("Failed: sigqueue() queued SIGQUEUE_MAX+1 signals\n"); 94 return PTS_FAIL; 95 } 96 97 done: 98 printf("Test PASSED\n"); 99 100 return PTS_PASS; 101 } 102
