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 _XOPEN_SOURCE 600 26 #define SIGTOTEST SIGRTMIN 27 28 #include <signal.h> 29 #include <stdio.h> 30 #include <unistd.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <errno.h> 34 #include <sys/types.h> 35 #include <pwd.h> 36 #include "posixtest.h" 37 38 #define MAX_ATTEMPTS 10000 39 40 static int reset_uid(void) 41 { 42 uid_t uid; 43 44 if (getuid()) 45 return 0; 46 47 /* Search for an unused uid */ 48 for (uid = 0; uid < MAX_ATTEMPTS; uid++) { 49 if (!getpwuid(uid) && !setuid(uid)) 50 return 0; 51 } 52 53 printf("Failed: No unused uid's in %d attempts\n", MAX_ATTEMPTS); 54 return -1; 55 } 56 57 int main(void) 58 { 59 int pid = getpid(); 60 int i; 61 long syslimit; 62 int rc; 63 union sigval value; 64 65 value.sival_int = 0; /* 0 is just an arbitrary value */ 66 pid = getpid(); 67 68 sighold(SIGTOTEST); 69 70 rc = reset_uid(); 71 if (rc) 72 return PTS_UNRESOLVED; 73 74 /* 75 * Get system limit. Note that this limit is optional. 76 */ 77 syslimit = sysconf(_SC_SIGQUEUE_MAX); 78 if (syslimit < 0) 79 goto done; 80 81 for (i = 0; i < syslimit; i++) { 82 if (sigqueue(pid, SIGTOTEST, value) != 0) { 83 printf("Failed: sigqueue on %d of %d max, errno: %s\n", 84 i, syslimit, strerror(errno)); 85 return PTS_UNRESOLVED; 86 } 87 } 88 89 /* 90 * Enqueue one more, needs to fail with EAGAIN 91 */ 92 rc = sigqueue(pid, SIGTOTEST, value); 93 if (!(rc == -1 && errno == EAGAIN)) { 94 printf("Failed: sigqueue() queued SIGQUEUE_MAX+1 signals\n"); 95 return PTS_FAIL; 96 } 97 98 done: 99 printf("Test PASSED\n"); 100 101 return PTS_PASS; 102 } 103
