Hi Michael, See a few corrections below. Cheers, Alex On 1/4/21 7:04 PM, Alejandro Colomar wrote: > man-pages bug: 211029 > https://bugzilla.kernel.org/show_bug.cgi?id=211029 > > Reported-by: Ciprian Dorin Craciun <ciprian.craciun@xxxxxxxxx> > Cc: Florian Weimer <fweimer@xxxxxxxxxx> > Signed-off-by: Alejandro Colomar <alx.manpages@xxxxxxxxx> > --- > man3/system.3 | 34 ++++++++++++++++++++++++++++++++++ > 1 file changed, 34 insertions(+) > > diff --git a/man3/system.3 b/man3/system.3 > index aef40417a..0310d9a04 100644 > --- a/man3/system.3 > +++ b/man3/system.3 > @@ -250,6 +250,40 @@ are not executed. > Such risks are especially grave when using > .BR system () > from a privileged program. > +.SH BUGS > +./" [BUG 211029](https://bugzilla.kernel.org/show_bug.cgi?id=211029) > +./" [Glibc bug](https://sourceware.org/bugzilla/show_bug.cgi?id=27143) > +./" [POSIX bug](https://www.austingroupbugs.net/view.php?id=1440) > +If the command name starts with a hyphen, > +.BR sh (1) > +interprets the command name as an option, > +and the behavior is undefined > +(See the > +.B \-c > +option in option to > +.BR sh (1).). > +To work around this problem, > +prepend the command with a space as below: > +.PP > +.RS 4 > +.EX > +/* system_hyphen.c */ > + > +#include <stdlib.h> > + > +int > +main(void) > +{ > + system(" -echo Hello world!"); \-echo > + exit(EXIT_SUCCESS); > +} > +.PP > +.RB "$" " sudo ln \-s \-T /usr/bin/echo /usr/bin/\-echo;" > +.RB "$" " cc \-o system_hyphen system_hyphen.c;" > +.RB "$" " ./system_hyphen;" > +Hello world! > +.EE > +.RE > .SH SEE ALSO > .BR sh (1), > .BR execve (2), > -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/
