mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
61eb2eb434
Automatically adapt the now wider and word wrapped perf list output to wider terminals. This requires querying the terminal before the auto pager takes over, and exporting this information from the pager subsystem. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1473978296-20712-8-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
#include <sys/select.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include "pager.h"
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#include "run-command.h"
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#include "sigchain.h"
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#include "subcmd-config.h"
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/*
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* This is split up from the rest of git so that we can do
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* something different on Windows.
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*/
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static int spawned_pager;
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static int pager_columns;
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void pager_init(const char *pager_env)
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{
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subcmd_config.pager_env = pager_env;
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}
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static void pager_preexec(void)
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{
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/*
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* Work around bug in "less" by not starting it until we
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* have real input
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*/
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fd_set in;
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FD_ZERO(&in);
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FD_SET(0, &in);
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select(1, &in, NULL, &in, NULL);
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setenv("LESS", "FRSX", 0);
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}
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static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
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static struct child_process pager_process;
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static void wait_for_pager(void)
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{
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fflush(stdout);
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fflush(stderr);
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/* signal EOF to pager */
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close(1);
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close(2);
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finish_command(&pager_process);
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}
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static void wait_for_pager_signal(int signo)
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{
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wait_for_pager();
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sigchain_pop(signo);
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raise(signo);
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}
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void setup_pager(void)
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{
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const char *pager = getenv(subcmd_config.pager_env);
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struct winsize sz;
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if (!isatty(1))
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return;
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if (ioctl(1, TIOCGWINSZ, &sz) == 0)
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pager_columns = sz.ws_col;
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if (!pager)
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pager = getenv("PAGER");
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if (!(pager || access("/usr/bin/pager", X_OK)))
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pager = "/usr/bin/pager";
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if (!(pager || access("/usr/bin/less", X_OK)))
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pager = "/usr/bin/less";
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if (!pager)
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pager = "cat";
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if (!*pager || !strcmp(pager, "cat"))
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return;
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spawned_pager = 1; /* means we are emitting to terminal */
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/* spawn the pager */
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pager_argv[2] = pager;
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pager_process.argv = pager_argv;
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pager_process.in = -1;
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pager_process.preexec_cb = pager_preexec;
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if (start_command(&pager_process))
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return;
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/* original process continues, but writes to the pipe */
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dup2(pager_process.in, 1);
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if (isatty(2))
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dup2(pager_process.in, 2);
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close(pager_process.in);
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/* this makes sure that the parent terminates after the pager */
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sigchain_push_common(wait_for_pager_signal);
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atexit(wait_for_pager);
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}
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int pager_in_use(void)
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{
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return spawned_pager;
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}
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int pager_get_columns(void)
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{
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char *s;
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s = getenv("COLUMNS");
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if (s)
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return atoi(s);
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return (pager_columns ? pager_columns : 80) - 2;
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}
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