1 #include <sys/select.h>
7 #include "run-command.h"
9 #include "subcmd-config.h"
12 * This is split up from the rest of git so that we can do
13 * something different on Windows.
16 static int spawned_pager;
18 void pager_init(const char *pager_env)
20 subcmd_config.pager_env = pager_env;
23 static void pager_preexec(void)
26 * Work around bug in "less" by not starting it until we
33 select(1, &in, NULL, &in, NULL);
35 setenv("LESS", "FRSX", 0);
38 static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
39 static struct child_process pager_process;
41 static void wait_for_pager(void)
45 /* signal EOF to pager */
48 finish_command(&pager_process);
51 static void wait_for_pager_signal(int signo)
58 void setup_pager(void)
60 const char *pager = getenv(subcmd_config.pager_env);
65 pager = getenv("PAGER");
66 if (!(pager || access("/usr/bin/pager", X_OK)))
67 pager = "/usr/bin/pager";
68 if (!(pager || access("/usr/bin/less", X_OK)))
69 pager = "/usr/bin/less";
72 if (!*pager || !strcmp(pager, "cat"))
75 spawned_pager = 1; /* means we are emitting to terminal */
78 pager_argv[2] = pager;
79 pager_process.argv = pager_argv;
80 pager_process.in = -1;
81 pager_process.preexec_cb = pager_preexec;
83 if (start_command(&pager_process))
86 /* original process continues, but writes to the pipe */
87 dup2(pager_process.in, 1);
89 dup2(pager_process.in, 2);
90 close(pager_process.in);
92 /* this makes sure that the parent terminates after the pager */
93 sigchain_push_common(wait_for_pager_signal);
94 atexit(wait_for_pager);
97 int pager_in_use(void)