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'slabtop -o' with stdin not a tty would complain

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When the command is executed in one shot mode (-o) with stdin
being something other than a terminal,  the tcgetattr() call
would fail,  and generate an error message. e.g.:

slabtop: terminal setting retrieval: Inappropriate ioctl for device
 Active / Total Objects (% used)    : 905319 / 915886 (98.8%)

Signed-off-by: Craig Small <csmall@enc.com.au>
This commit is contained in:
Derek Fawcus 2015-01-15 13:14:53 +00:00 committed by Craig Small
parent 7610b3128e
commit 96c524990b
1 changed files with 5 additions and 3 deletions
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8
slabtop.c
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@ -286,7 +286,7 @@ static void parse_input(char c)
#define print_line(fmt, ...) if (run_once) printf(fmt, __VA_ARGS__); else printw(fmt, __VA_ARGS__) #define print_line(fmt, ...) if (run_once) printf(fmt, __VA_ARGS__); else printw(fmt, __VA_ARGS__)
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
int o; int is_tty, o;
unsigned short old_rows; unsigned short old_rows;
struct slab_info *slab_list = NULL; struct slab_info *slab_list = NULL;
int run_once = 0, retval = EXIT_SUCCESS; int run_once = 0, retval = EXIT_SUCCESS;
@ -337,7 +337,8 @@ int main(int argc, char *argv[])
} }
} }
if (tcgetattr(STDIN_FILENO, &saved_tty) == -1) is_tty = isatty(STDIN_FILENO);
if (is_tty && tcgetattr(STDIN_FILENO, &saved_tty) == -1)
xwarn(_("terminal setting retrieval")); xwarn(_("terminal setting retrieval"));
old_rows = rows; old_rows = rows;
@ -429,7 +430,8 @@ int main(int argc, char *argv[])
} }
} while (delay); } while (delay);
tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tty); if (is_tty)
tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tty);
free_slabinfo(slab_list); free_slabinfo(slab_list);
if (!run_once) if (!run_once)
endwin(); endwin();