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 | ||
| 12 | #ifndef __MINGW32__ | |
| 13 | static void pager_preexec(void) | |
| 14 | { | |
| 15 | /* | |
| 16 | * Work around bug in "less" by not starting it until we | |
| 17 | * have real input | |
| 18 | */ | |
| 19 | fd_set in; | |
| 20 | ||
| 21 | FD_ZERO(&in); | |
| 22 | FD_SET(0, &in); | |
| 23 | select(1, &in, NULL, &in, NULL); | |
| 24 | ||
| 25 | setenv("LESS", "FRSX", 0); | |
| 26 | } | |
| 27 | #endif | |
| 28 | ||
| 29 | static const char *pager_argv[] = { "sh", "-c", NULL, NULL }; | |
| 30 | static struct child_process pager_process; | |
| 31 | ||
| 32 | static void wait_for_pager(void) | |
| 33 | { | |
| 34 | fflush(stdout); | |
| 35 | fflush(stderr); | |
| 36 | /* signal EOF to pager */ | |
| 37 | close(1); | |
| 38 | close(2); | |
| 39 | finish_command(&pager_process); | |
| 40 | } | |
| 41 | ||
| 42 | static void wait_for_pager_signal(int signo) | |
| 43 | { | |
| 44 | wait_for_pager(); | |
| 45 | sigchain_pop(signo); | |
| 46 | raise(signo); | |
| 47 | } | |
| 48 | ||
| 49 | void setup_pager(void) | |
| 50 | { | |
| 51 | const char *pager = getenv("PERF_PAGER"); | |
| 52 | ||
| 53 | if (!isatty(1)) | |
| 54 | return; | |
| 55 | if (!pager) { | |
| 56 | if (!pager_program) | |
| 57 | perf_config(perf_default_config, NULL); | |
| 58 | pager = pager_program; | |
| 59 | } | |
| 60 | if (!pager) | |
| 61 | pager = getenv("PAGER"); | |
| 62 | if (!pager) | |
| 63 | pager = "less"; | |
| 64 | else if (!*pager || !strcmp(pager, "cat")) | |
| 65 | return; | |
| 66 | ||
| 67 | spawned_pager = 1; /* means we are emitting to terminal */ | |
| 68 | ||
| 69 | /* spawn the pager */ | |
| 70 | pager_argv[2] = pager; | |
| 71 | pager_process.argv = pager_argv; | |
| 72 | pager_process.in = -1; | |
| 73 | #ifndef __MINGW32__ | |
| 74 | pager_process.preexec_cb = pager_preexec; | |
| 75 | #endif | |
| 76 | if (start_command(&pager_process)) | |
| 77 | return; | |
| 78 | ||
| 79 | /* original process continues, but writes to the pipe */ | |
| 80 | dup2(pager_process.in, 1); | |
| 81 | if (isatty(2)) | |
| 82 | dup2(pager_process.in, 2); | |
| 83 | close(pager_process.in); | |
| 84 | ||
| 85 | /* this makes sure that the parent terminates after the pager */ | |
| 86 | sigchain_push_common(wait_for_pager_signal); | |
| 87 | atexit(wait_for_pager); | |
| 88 | } | |
| 89 | ||
| 90 | int pager_in_use(void) | |
| 91 | { | |
| 92 | const char *env; | |
| 93 | ||
| 94 | if (spawned_pager) | |
| 95 | return 1; | |
| 96 | ||
| 97 | env = getenv("PERF_PAGER_IN_USE"); | |
| 98 | return env ? perf_config_bool("PERF_PAGER_IN_USE", env) : 0; | |
| 99 | } |