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16ea9c7aa3
Since the pager was spawned as child process, it does not notice when the parent (which feeds its stdin) terminates. If the pager is 'less' it so looses control over the terminal and cannot be controled by the user anymore. For this reason, we register a function atexit() that explicitly waits for the pager to terminate.
87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
#include "cache.h"
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#include "spawn-pipe.h"
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/*
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* This is split up from the rest of git so that we might do
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* something different on Windows, for example.
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*/
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#ifndef __MINGW32__
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static void run_pager(const char *pager)
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{
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execlp(pager, pager, NULL);
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execl("/bin/sh", "sh", "-c", pager, NULL);
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}
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#else
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static pid_t pager_pid;
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static void collect_pager(void)
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{
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close(1); /* signals EOF to pager */
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cwait(NULL, pager_pid, 0);
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}
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#endif
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void setup_pager(void)
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{
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#ifndef __MINGW32__
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pid_t pid;
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#else
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const char *pager_argv[] = { "sh", "-c", NULL, NULL };
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#endif
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int fd[2];
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const char *pager = getenv("GIT_PAGER");
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if (!isatty(1))
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return;
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if (!pager)
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pager = getenv("PAGER");
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if (!pager)
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pager = "less";
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else if (!*pager || !strcmp(pager, "cat"))
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return;
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pager_in_use = 1; /* means we are emitting to terminal */
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if (pipe(fd) < 0)
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return;
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#ifndef __MINGW32__
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pid = fork();
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if (pid < 0) {
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close(fd[0]);
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close(fd[1]);
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return;
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}
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/* return in the child */
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if (!pid) {
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dup2(fd[1], 1);
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close(fd[0]);
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close(fd[1]);
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return;
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}
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/* The original process turns into the PAGER */
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dup2(fd[0], 0);
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close(fd[0]);
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close(fd[1]);
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setenv("LESS", "FRSX", 0);
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run_pager(pager);
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die("unable to execute pager '%s'", pager);
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exit(255);
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#else
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/* spawn the pager */
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pager_argv[2] = pager;
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pager_pid = spawnvpe_pipe(pager_argv[0], pager_argv, environ, fd, NULL);
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if (pager_pid < 0)
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return;
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/* original process continues, but writes to the pipe */
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dup2(fd[1], 1);
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close(fd[1]);
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/* this makes sure that the parent terminates after the pager */
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atexit(collect_pager);
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#endif
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}
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