mirror of
https://github.com/fish-shell/fish-shell
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109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
// Implementation of the disown builtin.
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#include "config.h" // IWYU pragma: keep
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#include <errno.h>
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#include <signal.h>
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#include <set>
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#include "builtin.h"
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#include "builtin_disown.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 for builtin_disown.
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static int disown_job(const wchar_t *cmd, parser_t &parser, io_streams_t &streams, job_t *j) {
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if (j == nullptr) {
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streams.err.append_format(_(L"%ls: Unknown job '%ls'\n"), L"bg");
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builtin_print_error_trailer(parser, streams.err, cmd);
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return STATUS_INVALID_ARGS;
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}
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// Stopped disowned jobs must be manually signaled; explain how to do so.
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if (j->is_stopped()) {
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killpg(j->pgid, SIGCONT);
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const wchar_t *fmt =
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_(L"%ls: job %d ('%ls') was stopped and has been signalled to continue.\n");
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streams.err.append_format(fmt, cmd, j->job_id, j->command_wcstr());
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}
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// We cannot directly remove the job from the jobs() list as `disown` might be called
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// within the context of a subjob which will cause the parent job to crash in exec_job().
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// Instead, we set a flag and the parser removes the job from the jobs list later.
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j->set_flag(job_flag_t::DISOWN_REQUESTED, true);
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add_disowned_pgid(j->pgid);
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return STATUS_CMD_OK;
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}
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/// Builtin for removing jobs from the job list.
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int builtin_disown(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, streams.out);
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return STATUS_CMD_OK;
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}
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if (argv[1] == 0) {
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// Select last constructed job (ie first job in the job queue) that is possible to disown.
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// Stopped jobs can be disowned (they will be continued).
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// Foreground jobs can be disowned.
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// Even jobs that aren't under job control can be disowned!
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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_constructed() && (!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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retval = disown_job(cmd, parser, streams, job);
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} else {
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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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}
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} else {
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std::set<job_t *> jobs;
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// If one argument is not a valid pid (i.e. integer >= 0), fail without disowning anything,
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// but still print errors for all of them.
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// Non-existent jobs aren't an error, but information about them is useful.
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// Multiple PIDs may refer to the same job; include the job only once by using a set.
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for (int i = 1; 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"), cmd,
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argv[i]);
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retval = STATUS_INVALID_ARGS;
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} else {
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if (job_t *j = parser.job_get_from_pid(pid)) {
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jobs.insert(j);
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} else {
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streams.err.append_format(_(L"%ls: Could not find job '%d'\n"), cmd, pid);
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}
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}
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}
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if (retval != STATUS_CMD_OK) {
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return retval;
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}
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// Disown all target jobs
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for (const auto &j : jobs) {
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retval |= disown_job(cmd, parser, streams, j);
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}
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}
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return retval;
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}
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