From d6f6072560c963065b13c704fa1fa6f8950e4bac Mon Sep 17 00:00:00 2001 From: Lars Hjemli Date: Fri, 31 Jul 2009 17:38:38 +0200 Subject: Add generic filter/plugin infrastructure The functions cgit_open_filter() and cgit_close_filter() can be used to execute filters on the output stream from cgit. Signed-off-by: Lars Hjemli --- shared.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'shared.c') diff --git a/shared.c b/shared.c index cce0af4..288cfa2 100644 --- a/shared.c +++ b/shared.c @@ -355,3 +355,38 @@ int cgit_parse_snapshots_mask(const char *str) } return rv; } + +int cgit_open_filter(struct cgit_filter *filter) +{ + + filter->old_stdout = chk_positive(dup(STDOUT_FILENO), + "Unable to duplicate STDOUT"); + chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess"); + filter->pid = chk_non_negative(fork(), "Unable to create subprocess"); + if (filter->pid == 0) { + close(filter->pipe_fh[1]); + chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO), + "Unable to use pipe as STDIN"); + execvp(filter->cmd, filter->argv); + die("Unable to exec subprocess %s: %s (%d)", filter->cmd, + strerror(errno), errno); + } + close(filter->pipe_fh[0]); + chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO), + "Unable to use pipe as STDOUT"); + close(filter->pipe_fh[1]); + return 0; +} + +int cgit_close_filter(struct cgit_filter *filter) +{ + chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO), + "Unable to restore STDOUT"); + close(filter->old_stdout); + if (filter->pid < 0) + return 0; + waitpid(filter->pid, &filter->exitstatus, 0); + if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus)) + return 0; + die("Subprocess %s exited abnormally", filter->cmd); +} -- cgit v1.2.3-59-g8ed1b