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102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
// Implementation of the bg builtin.
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#include "config.h" // IWYU pragma: keep
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#include "builtin_bg.h"
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#include <cerrno>
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#include <cstdlib>
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#include <memory>
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#include <vector>
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#include "builtin.h"
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#include "common.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "io.h"
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#include "parser.h"
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#include "proc.h"
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#include "wutil.h" // IWYU pragma: keep
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/// Helper function for builtin_bg().
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static int send_to_bg(parser_t &parser, io_streams_t &streams, job_t *j) {
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assert(j != nullptr);
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if (!j->wants_job_control()) {
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wcstring error_message = format_string(
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_(L"%ls: Can't put job %d, '%ls' to background because it is not under job control\n"),
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L"bg", j->job_id(), j->command_wcstr());
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builtin_print_help(parser, streams, L"bg", &error_message);
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return STATUS_CMD_ERROR;
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}
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streams.err.append_format(_(L"Send job %d '%ls' to background\n"), j->job_id(),
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j->command_wcstr());
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parser.job_promote(j);
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j->mut_flags().foreground = false;
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j->continue_job(parser, true, j->is_stopped());
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return STATUS_CMD_OK;
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}
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/// Builtin for putting a job in the background.
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int builtin_bg(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
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const wchar_t *cmd = argv[0];
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int argc = builtin_count_args(argv);
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help_only_cmd_opts_t opts;
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int optind;
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int retval = parse_help_only_cmd_opts(opts, &optind, argc, argv, parser, streams);
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if (retval != STATUS_CMD_OK) return retval;
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if (opts.print_help) {
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builtin_print_help(parser, streams, cmd);
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return STATUS_CMD_OK;
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}
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if (optind == argc) {
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// No jobs were specified so use the most recent (i.e., last) job.
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job_t *job = nullptr;
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for (const auto &j : parser.jobs()) {
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if (j->is_stopped() && j->wants_job_control() && (!j->is_completed())) {
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job = j.get();
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break;
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}
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}
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if (!job) {
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streams.err.append_format(_(L"%ls: There are no suitable jobs\n"), cmd);
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retval = STATUS_CMD_ERROR;
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} else {
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retval = send_to_bg(parser, streams, job);
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}
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return retval;
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}
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// The user specified at least one job to be backgrounded.
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std::vector<int> pids;
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// If one argument is not a valid pid (i.e. integer >= 0), fail without backgrounding anything,
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// but still print errors for all of them.
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for (int i = optind; argv[i]; i++) {
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int pid = fish_wcstoi(argv[i]);
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if (errno || pid < 0) {
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streams.err.append_format(_(L"%ls: '%ls' is not a valid job specifier\n"), L"bg",
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argv[i]);
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retval = STATUS_INVALID_ARGS;
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}
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pids.push_back(pid);
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}
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if (retval != STATUS_CMD_OK) return retval;
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// Background all existing jobs that match the pids.
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// Non-existent jobs aren't an error, but information about them is useful.
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for (auto p : pids) {
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if (job_t *j = parser.job_get_from_pid(p)) {
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retval |= send_to_bg(parser, streams, j);
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} else {
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streams.err.append_format(_(L"%ls: Could not find job '%d'\n"), cmd, p);
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}
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}
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return retval;
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}
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