c - User defined signal message -

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so, i'm using signals project, , i'm getting not error think.

i'll explain, got code, sr2 global variable triggered signal sigusr2 , signal handling working fine. compile , run, , when trigger sigusr2, prints "user defined signal 2" , stops.

i have code in while(1) loop , it's not supposed stop. can fix problem printting something, printf commented, keeps printing forever, , can't make new inputs, trigger other signals.

int teste( const char* path , const char* cadeia, const char* erro ) { int i, x, stat; int fd = open( path, o_wronly | o_creat , s_irusr | s_iwusr | s_ixusr | s_irgrp | s_iwgrp | s_ixgrp | s_iroth | s_iwoth | s_ixoth );  x = flock(fd, lock_ex);  if ( sr1 ) {     printf("sr1\n");     //sr1 = !sr1 ; } if ( !sr2 ) {     ( i=0 ; i<cadeias ; i++ )     {         stat = write( fd, cadeia, strlen(cadeia));     } } else {     printf("\n");     ( i=0 ; i<cadeias/2 ; i++ )     {         stat = write( fd, cadeia, strlen(cadeia));         stat = write( fd, erro, strlen(erro));     } } if ( stp ) {     printf("gtfo\n"); }  x = flock(fd, lock_un); close(fd); return 0 ; }

this called in "thread maker":

void * threadescritor() { int ; char *f, *c, *e ;  f = (char *)malloc(sizeof(sizeficheiro)); c = (char *)malloc(sizeof(sizecadeia)); e = (char *)malloc(sizeof(sizecadeia));  while(1) {     = randomnum(4);     f = pickfile(a, f);     = randomnum(9);     c = pickchar(a, c);     e = pickerror(a, e);      //escreve1x(f, c, e);     teste(f, c, e);      if(stp)     {         break;     } } pthread_exit(0); }

which called in main:

int main () {    pthread_t tids[num_threads];  int i, safe ; void* resultado;  sr1 = false ; sr2 = false ; stp = false ;  signal( sigusr1, sighandler ); signal( sigusr2, sighandler ); signal( sigtstp, sighandler );  ( i=0; i<num_threads ; i++ ) {     safe = pthread_create( &(tids[i]) , null , threadescritor ) ;     if ( safe != 0 )         perror ("error creating threads"); }  ( i=0; i<num_threads ; i++ ) {     safe = pthread_join( tids[i],  &resultado ) ;     if ( safe != 0 )      {         perror ("errors waiting");     } } }

so wondering why message showing (since i'm not printing anywhere) , why stops while(1) loop, , why if make printf() "solves" problem.


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