/* Portable function to create a pipe. Under Windows the read end is inheritable. If R_FP is not NULL, an estream is created for the write end and stored at R_FP. */ gpg_error_t gnupg_create_outbound_pipe (int filedes[2], estream_t *r_fp, int nonblock) { if (r_fp) return create_pipe_and_estream (filedes, r_fp, 1, nonblock); else return do_create_pipe (filedes); }
/* Fork and exec the PGMNAME, see exechelp.h for details. */ gpg_error_t gnupg_spawn_process (const char *pgmname, const char *argv[], gpg_err_source_t errsource, void (*preexec)(void), unsigned int flags, estream_t infp, estream_t *r_outfp, estream_t *r_errfp, pid_t *pid) { gpg_error_t err; int infd = -1; int outpipe[2] = {-1, -1}; int errpipe[2] = {-1, -1}; estream_t outfp = NULL; estream_t errfp = NULL; (void)flags; /* Currently not used. */ if (r_outfp) *r_outfp = NULL; if (r_errfp) *r_errfp = NULL; *pid = (pid_t)(-1); /* Always required. */ if (infp) { es_fflush (infp); es_rewind (infp); infd = es_fileno (infp); if (infd == -1) return gpg_err_make (errsource, GPG_ERR_INV_VALUE); } if (r_outfp) { err = create_pipe_and_estream (outpipe, &outfp, errsource); if (err) return err; } if (r_errfp) { err = create_pipe_and_estream (errpipe, &errfp, errsource); if (err) { if (outfp) es_fclose (outfp); else if (outpipe[0] != -1) close (outpipe[0]); if (outpipe[1] != -1) close (outpipe[1]); return err; } } *pid = fork (); if (*pid == (pid_t)(-1)) { err = gpg_err_make (errsource, gpg_err_code_from_syserror ()); log_error (_("error forking process: %s\n"), gpg_strerror (err)); if (outfp) es_fclose (outfp); else if (outpipe[0] != -1) close (outpipe[0]); if (outpipe[1] != -1) close (outpipe[1]); if (errfp) es_fclose (errfp); else if (errpipe[0] != -1) close (errpipe[0]); if (errpipe[1] != -1) close (errpipe[1]); return err; } if (!*pid) { /* This is the child. */ gcry_control (GCRYCTL_TERM_SECMEM); es_fclose (outfp); es_fclose (errfp); do_exec (pgmname, argv, infd, outpipe[1], errpipe[1], preexec); /*NOTREACHED*/ } /* This is the parent. */ if (outpipe[1] != -1) close (outpipe[1]); if (errpipe[1] != -1) close (errpipe[1]); if (r_outfp) *r_outfp = outfp; if (r_errfp) *r_errfp = errfp; return 0; }
/* Fork and exec the PGMNAME, see exechelp.h for details. */ gpg_error_t gnupg_spawn_process (const char *pgmname, const char *argv[], int *except, void (*preexec)(void), unsigned int flags, estream_t *r_infp, estream_t *r_outfp, estream_t *r_errfp, pid_t *pid) { gpg_error_t err; int inpipe[2] = {-1, -1}; int outpipe[2] = {-1, -1}; int errpipe[2] = {-1, -1}; estream_t infp = NULL; estream_t outfp = NULL; estream_t errfp = NULL; int nonblock = !!(flags & GNUPG_SPAWN_NONBLOCK); if (r_infp) *r_infp = NULL; if (r_outfp) *r_outfp = NULL; if (r_errfp) *r_errfp = NULL; *pid = (pid_t)(-1); /* Always required. */ if (r_infp) { err = create_pipe_and_estream (inpipe, &infp, 1, nonblock); if (err) return err; } if (r_outfp) { err = create_pipe_and_estream (outpipe, &outfp, 0, nonblock); if (err) { if (infp) es_fclose (infp); else if (inpipe[1] != -1) close (inpipe[1]); if (inpipe[0] != -1) close (inpipe[0]); return err; } } if (r_errfp) { err = create_pipe_and_estream (errpipe, &errfp, 0, nonblock); if (err) { if (infp) es_fclose (infp); else if (inpipe[1] != -1) close (inpipe[1]); if (inpipe[0] != -1) close (inpipe[0]); if (outfp) es_fclose (outfp); else if (outpipe[0] != -1) close (outpipe[0]); if (outpipe[1] != -1) close (outpipe[1]); return err; } } *pid = fork (); if (*pid == (pid_t)(-1)) { err = my_error_from_syserror (); log_error (_("error forking process: %s\n"), gpg_strerror (err)); if (infp) es_fclose (infp); else if (inpipe[1] != -1) close (inpipe[1]); if (inpipe[0] != -1) close (inpipe[0]); if (outfp) es_fclose (outfp); else if (outpipe[0] != -1) close (outpipe[0]); if (outpipe[1] != -1) close (outpipe[1]); if (errfp) es_fclose (errfp); else if (errpipe[0] != -1) close (errpipe[0]); if (errpipe[1] != -1) close (errpipe[1]); return err; } if (!*pid) { /* This is the child. */ gcry_control (GCRYCTL_TERM_SECMEM); es_fclose (outfp); es_fclose (errfp); do_exec (pgmname, argv, inpipe[0], outpipe[1], errpipe[1], except, preexec); /*NOTREACHED*/ } /* This is the parent. */ if (inpipe[0] != -1) close (inpipe[0]); if (outpipe[1] != -1) close (outpipe[1]); if (errpipe[1] != -1) close (errpipe[1]); if (r_infp) *r_infp = infp; if (r_outfp) *r_outfp = outfp; if (r_errfp) *r_errfp = errfp; return 0; }