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Check that ee's standard input and output is a terminal.

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Do not ignore all the signals in range [1..24].

PR:		65892
MFC after:	2 weeks
This commit is contained in:
Max Khon 2004-11-05 10:18:05 +00:00
parent 2fdf5be172
commit 0acb526b67
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=137249
1 changed files with 5 additions and 4 deletions
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9
usr.bin/ee/ee.c
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@ -544,10 +544,11 @@ main(argc, argv) /* beginning of main program */
int argc;
char *argv[];
{
int counter;
for (counter = 1; counter < 24; counter++)
signal(counter, SIG_IGN);
/* Always read from (and write to) a terminal. */
if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO)) {
fprintf(stderr, "ee's standard input and output must be a terminal\n");
exit(1);
}
signal(SIGCHLD, SIG_DFL);
signal(SIGSEGV, SIG_DFL);