diff options
| -rw-r--r-- | main.c | 38 |
1 files changed, 34 insertions, 4 deletions
@@ -27,6 +27,7 @@ #if HAVE_ERR #include <err.h> #endif +#include <errno.h> #include <fcntl.h> #include <glob.h> #include <signal.h> @@ -131,7 +132,9 @@ main(int argc, char *argv[]) int show_usage; int options; int use_pager; + int status; int c; + pid_t pager_pid; #if HAVE_PROGNAME progname = getprogname(); @@ -152,7 +155,7 @@ main(int argc, char *argv[]) #endif #if HAVE_PLEDGE - if (pledge("stdio rpath tmppath proc exec flock", NULL) == -1) + if (pledge("stdio rpath tmppath tty proc exec flock", NULL) == -1) err((int)MANDOCLEVEL_SYSERR, "pledge"); #endif @@ -427,7 +430,7 @@ main(int argc, char *argv[]) /* mandoc(1) */ #if HAVE_PLEDGE - if (pledge(use_pager ? "stdio rpath tmppath proc exec" : + if (pledge(use_pager ? "stdio rpath tmppath tty proc exec" : "stdio rpath", NULL) == -1) err((int)MANDOCLEVEL_SYSERR, "pledge"); #endif @@ -527,7 +530,29 @@ out: if (tag_files != NULL) { fclose(stdout); tag_write(); - waitpid(spawn_pager(tag_files), NULL, 0); + pager_pid = spawn_pager(tag_files); + for (;;) { + if (waitpid(pager_pid, &status, WUNTRACED) == -1) { + if (errno == EINTR) + continue; + warn("wait"); + rc = MANDOCLEVEL_SYSERR; + break; + } + if (!WIFSTOPPED(status)) + break; + + (void)tcsetpgrp(STDIN_FILENO, getpgid(0)); + kill(0, WSTOPSIG(status)); + + /* + * I'm now stopped. + * When getting SIGCONT, continue here: + */ + + (void)tcsetpgrp(STDIN_FILENO, pager_pid); + kill(pager_pid, SIGCONT); + } tag_unlink(); } @@ -1016,10 +1041,15 @@ spawn_pager(struct tag_files *tag_files) case -1: err((int)MANDOCLEVEL_SYSERR, "fork"); case 0: + /* Set pgrp in both parent and child to avoid racing exec. */ + (void)setpgid(0, 0); break; default: + (void)setpgid(pager_pid, 0); + if (tcsetpgrp(STDIN_FILENO, pager_pid) == -1) + err((int)MANDOCLEVEL_SYSERR, "tcsetpgrp"); #if HAVE_PLEDGE - if (pledge("stdio rpath tmppath", NULL) == -1) + if (pledge("stdio rpath tmppath tty proc", NULL) == -1) err((int)MANDOCLEVEL_SYSERR, "pledge"); #endif return pager_pid; |