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(ENOSYS): Define to a bogus value if not already defined.

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(parse_options): Warn if --pid=PID is used and kill()
returns ENOSYS (e.g. when compiled with DJGPP).
This commit is contained in:
Jim Meyering
1999-08-15 12:56:00 +00:00
parent 22cdfc8955
commit 7228350401
1 changed files with 11 additions and 0 deletions
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11
src/tail.c
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@@ -51,6 +51,12 @@
# define OFF_T_MAX TYPE_MAXIMUM (off_t)
#endif
#ifndef ENOSYS
/* Some systems don't have ENOSYS -- this should be a big enough
value that no valid errno value will match it. */
# define ENOSYS 99999
#endif
/* Number of items to tail. */
#define DEFAULT_N_LINES 10
@@ -1435,6 +1441,11 @@ parse_options (int argc, char **argv,
if (pid && !forever)
error (0, 0,
_("warning: PID ignored; --pid=PID is useful only when following"));
else if (pid && kill (pid, 0) != 0 && errno == ENOSYS)
{
error (0, 0, _("warning: --pid=PID is not supported on this system"));
pid = 0;
}
}
int