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-rw-r--r--src/shutdown/hpr_confirm_hostname.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/src/shutdown/hpr_confirm_hostname.c b/src/shutdown/hpr_confirm_hostname.c
index 040c2f6..e782c80 100644
--- a/src/shutdown/hpr_confirm_hostname.c
+++ b/src/shutdown/hpr_confirm_hostname.c
@@ -17,15 +17,17 @@
void hpr_confirm_hostname (void)
{
- char name[HOST_NAME_MAX + 1] ;
- char buf[HOST_NAME_MAX + 1] ;
char *p ;
ssize_t r ;
+ long hostnamemax = sysconf(_SC_HOST_NAME_MAX) ;
+ if (hostnamemax < 0) hostnamemax = _POSIX_HOST_NAME_MAX ;
+ char name[hostnamemax + 1] ;
+ char buf[hostnamemax + 1] ;
if (!isatty(0) || !isatty(1))
strerr_diefu1x(100, "ask hostname confirmation: stdin or stdout is not a tty") ;
- if (gethostname(name, HOST_NAME_MAX) < 0)
+ if (gethostname(name, hostnamemax) < 0)
strerr_diefu1sys(111, "get host name") ;
- name[HOST_NAME_MAX] = 0 ;
+ name[hostnamemax] = 0 ;
p = strchr(name, '.') ;
if (p) *p = 0 ;
if (allwrite(1, PROMPT, sizeof(PROMPT)-1) < 0)
@@ -34,7 +36,7 @@ void hpr_confirm_hostname (void)
strerr_diefu1sys(111, "tcdrain stdout") ;
if (tcflush(0, TCIFLUSH) < 0)
strerr_diefu1sys(111, "empty stdin buffer") ;
- r = fd_read(0, buf, HOST_NAME_MAX) ;
+ r = fd_read(0, buf, hostnamemax) ;
if (!r) errno = EPIPE ;
if (r <= 0) strerr_diefu1sys(111, "read from stdin") ;
buf[byte_chr(buf, r, '\n')] = 0 ;