Может кто-нибудь сказать мне, почему моя программа прерывается? Я компилирую его с помощью efence, которая прерывается на malloc (0), как предполагает обратная трассировка GDB, regcomp выполняет malloc (0)
1218 void extractTime(int extractStartTime)
1219 {
1220 char * charPtr, * numberFormatErr;
1221 regex_t re;
1222
1223 ( extractStartTime == 1 ) ? ( charPtr = getenv("EF_ERRTRACK_START") ) :
1224 ( charPtr = getenv("EF_ERRTRACK_END") );
1225
1226 if ( charPtr == NULL )
1227 return;
1228
1229 double envVal = strtod(charPtr, &numberFormatErr);
1230
1231 if ( (numberFormatErr == charPtr) || (*numberFormatErr != '\0') ) {
1232 ( extractStartTime == 1 ) ? EF_Print("eFence exited: EF_ERRTRACK_START is not a number\n") :
1233 EF_Print("eFence exited: EF_ERRTRACK_END is not a number\n");
1234 exit(1);
1235 }
1236 else if ( envVal < 0 ) {
1237 ( extractStartTime == 1 ) ? EF_Print("eFence exited: EF_ERRTRACK_START a negative number\n") :
1238 EF_Print("eFence exited: EF_ERRTRACK_END is a negative number\n");
1239 exit(1);
1240 }
1241
1242 /* If we are here then it is a valid number, now lets check if it is exponential or not */
1243
1244 regcomp(&re, "^([0-9]+[.]?[0-9]*|[0-9]*[.][0-9]+)[eE][+-]?[0-9]+$", REG_EXTENDED);
1245
1246 if ( regexec(&re, charPtr, 0, 0, 0) == 0 )
1247 {
1248 /* It is an exponential number, then already parsed by strtod earlier*/
1249 sprintf(charPtr, "%lf", envVal);
1250 }
1251
Вот обратная трассировка GDB:
(gdb) r
Starting program: /tmp/efence/ikatrack1_dev
[Thread debugging using libthread_db enabled]
Electric Fence 2.1 Copyright (C) 1987-1998 Bruce Perens.
ElectricFence Aborting: Allocating 0 bytes, probably a bug.
[New Thread 0x4001e350 (LWP 1528)]
Program received signal SIGILL, Illegal instruction.
[Switching to Thread 0x4001e350 (LWP 1528)]
0x4008734c in kill () from /devel/lib/libc.so.6
(gdb) bt
#0 0x4008734c in kill () from /devel/lib/libc.so.6
#1 0x0000b86c in EF_Abort (pattern=0x1000 <Address 0x1000 out of bounds>)
at print.c:137
#2 0x00009564 in memalign (alignment=4, userSize=0) at efence.c:533
#3 0x0000a5bc in malloc (size=0) at efence.c:1027
#4 0x400fe5bc in re_node_set_alloc (set=0x4025cfd8, size=0)
at regex_internal.c:959
#5 0x400ff2ac in register_state (dfa=0x25, newstate=0x4025cfc8, hash=86528)
at regex_internal.c:1550
#6 0x40102d64 in re_acquire_state_context (err=0xbebd7b88, dfa=0x40196f74,
nodes=0xbebd7b74, context=0) at regex_internal.c:1706
#7 0x4010c060 in re_compile_internal (preg=0xbebd7bf0,
pattern=0xcb74 "^([0-9]+[.]?[0-9]*|[0-9]*[.][0-9]+)[eE][+-]?[0-9]+$",
length=<value optimized out>, syntax=242428) at regcomp.c:989
#8 0x4010d5f8 in __regcomp (preg=0xbebd7bf0,
pattern=0xcb74 "^([0-9]+[.]?[0-9]*|[0-9]*[.][0-9]+)[eE][+-]?[0-9]+$",
cflags=1) at regcomp.c:480
#9 0x0000ae1c in extractTime (extractStartTime=1) at efence.c:1244
#10 0x0000aa1c in efence_ctor () at efence.c:1144
#11 0x0000c528 in __libc_csu_init (argc=1, argv=0xbebd7de4, envp=0xbebd7dec)
at elf-init.c:83
#12 0x40070fe8 in __libc_start_main (main=0x8c54 <main>, argc=1,
ubp_av=0xbebd7de4, init=0xc4d0 <__libc_csu_init>,
---Type <return> to continue, or q <return> to quit---
fini=0xc4c0 <__libc_csu_fini>, rtld_fini=0x4000ea50 <_dl_fini>,
stack_end=0xbebd7de4) at libc-start.c:179
#13 0x00008bcc in _start ()
Из трассировки GDB я вижу, что проблема заключается в кадре № 4:
#4 0x400fe5bc in re_node_set_alloc (set=0x4025cfd8, size=0) где он делает malloc (0), но почему и почему?