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try to not call signaction for signal 0 and use NSIG if it exists to

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determin how many signals there exists, also, only restore those
signalhandlers that we got out.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@18156 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2006-09-22 15:42:39 +00:00
parent 294b75a0d6
commit 631229648a
1 changed files with 15 additions and 5 deletions
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20
appl/login/read_string.c
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@@ -43,10 +43,15 @@ intr(int sig)
intr_flag++;
}
#ifndef NSIG
#define NSIG 47
#endif
int
read_string(const char *prompt, char *buf, size_t len, int echo)
{
struct sigaction sigs[47];
struct sigaction sigs[NSIG];
int oksigs[NSIG];
struct sigaction sa;
FILE *tty;
int ret = 0;
@@ -57,12 +62,16 @@ read_string(const char *prompt, char *buf, size_t len, int echo)
struct termios t_new, t_old;
memset(&oksigs, 0, sizeof(oksigs));
memset(&sa, 0, sizeof(sa));
sa.sa_handler = intr;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
if (i != SIGALRM) sigaction(i, &sa, &sigs[i]);
for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
if (i != SIGALRM)
if (sigaction(i, &sa, &sigs[i]) == 0)
oksigs[i] = 1;
if((tty = fopen("/dev/tty", "r")) == NULL)
tty = stdin;
@@ -103,8 +112,9 @@ read_string(const char *prompt, char *buf, size_t len, int echo)
if(tty != stdin)
fclose(tty);
for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
if (i != SIGALRM) sigaction(i, &sigs[i], NULL);
for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
if (oksigs[i])
sigaction(i, &sigs[i], NULL);
if(ret)
return -3;