projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a930d2c0 IM |
1 | #include "cache.h" |
| 2 | #include "run-command.h" | |
| 3 | #include "sigchain.h" | |
| 4 | ||
| 5 | /* | |
| 6 | * This is split up from the rest of git so that we can do | |
| 7 | * something different on Windows. | |
| 8 | */ | |
| 9 | ||
| 10 | static int spawned_pager; | |
| 11 | ||
| a930d2c0 IM |
12 | static void pager_preexec(void) |
| 13 | { | |
| 14 | /* | |
| 15 | * Work around bug in "less" by not starting it until we | |
| 16 | * have real input | |
| 17 | */ | |
| 18 | fd_set in; | |
| 19 | ||
| 20 | FD_ZERO(&in); | |
| 21 | FD_SET(0, &in); | |
| 22 | select(1, &in, NULL, &in, NULL); | |
| 23 | ||
| 24 | setenv("LESS", "FRSX", 0); | |
| 25 | } | |
| a930d2c0 IM |
26 | |
| 27 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
| 28 | static struct child_process pager_process; | |
| 29 | ||
| 30 | static void wait_for_pager(void) | |
| 31 | { | |
| 32 | fflush(stdout); | |
| 33 | fflush(stderr); | |
| 34 | /* signal EOF to pager */ | |
| 35 | close(1); | |
| 36 | close(2); | |
| 37 | finish_command(&pager_process); | |
| 38 | } | |
| 39 | ||
| 40 | static void wait_for_pager_signal(int signo) | |
| 41 | { | |
| 42 | wait_for_pager(); | |
| 43 | sigchain_pop(signo); | |
| 44 | raise(signo); | |
| 45 | } | |
| 46 | ||
| 47 | void setup_pager(void) | |
| 48 | { | |
| 49 | const char *pager = getenv("PERF_PAGER"); | |
| 50 | ||
| 51 | if (!isatty(1)) | |
| 52 | return; | |
| 53 | if (!pager) { | |
| 54 | if (!pager_program) | |
| 55 | perf_config(perf_default_config, NULL); | |
| 56 | pager = pager_program; | |
| 57 | } | |
| 58 | if (!pager) | |
| 59 | pager = getenv("PAGER"); | |
| 60 | if (!pager) | |
| 61 | pager = "less"; | |
| 62 | else if (!*pager || !strcmp(pager, "cat")) | |
| 63 | return; | |
| 64 | ||
| 65 | spawned_pager = 1; /* means we are emitting to terminal */ | |
| 66 | ||
| 67 | /* spawn the pager */ | |
| 68 | pager_argv[2] = pager; | |
| 69 | pager_process.argv = pager_argv; | |
| 70 | pager_process.in = -1; | |
| a930d2c0 | 71 | pager_process.preexec_cb = pager_preexec; |
| fde953c1 | 72 | |
| a930d2c0 IM |
73 | if (start_command(&pager_process)) |
| 74 | return; | |
| 75 | ||
| 76 | /* original process continues, but writes to the pipe */ | |
| 77 | dup2(pager_process.in, 1); | |
| 78 | if (isatty(2)) | |
| 79 | dup2(pager_process.in, 2); | |
| 80 | close(pager_process.in); | |
| 81 | ||
| 82 | /* this makes sure that the parent terminates after the pager */ | |
| 83 | sigchain_push_common(wait_for_pager_signal); | |
| 84 | atexit(wait_for_pager); | |
| 85 | } | |
| 86 | ||
| 87 | int pager_in_use(void) | |
| 88 | { | |
| 89 | const char *env; | |
| 90 | ||
| 91 | if (spawned_pager) | |
| 92 | return 1; | |
| 93 | ||
| 94 | env = getenv("PERF_PAGER_IN_USE"); | |
| 95 | return env ? perf_config_bool("PERF_PAGER_IN_USE", env) : 0; | |
| 96 | } |