| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2022 Egor Tensin <egor@tensin.name> | ||
| 3 | * This file is part of the "cimple" project. | ||
| 4 | * For details, see https://github.com/egor-tensin/cimple. | ||
| 5 | * Distributed under the MIT License. | ||
| 6 | */ | ||
| 7 | |||
| 8 | #include "process.h" | ||
| 9 | #include "file.h" | ||
| 10 | #include "log.h" | ||
| 11 | |||
| 12 | #include <fcntl.h> | ||
| 13 | #include <stdlib.h> | ||
| 14 | #include <sys/wait.h> | ||
| 15 | #include <unistd.h> | ||
| 16 | |||
| 17 | ✗ | static int exec_child(const char *args[], const char *envp[]) | |
| 18 | { | ||
| 19 | static const char *default_envp[] = {NULL}; | ||
| 20 | |||
| 21 | ✗ | if (!envp) | |
| 22 | ✗ | envp = default_envp; | |
| 23 | |||
| 24 | ✗ | int ret = execvpe(args[0], (char *const *)args, (char *const *)envp); | |
| 25 | ✗ | if (ret < 0) { | |
| 26 | ✗ | log_errno("execvpe"); | |
| 27 | ✗ | return ret; | |
| 28 | } | ||
| 29 | |||
| 30 | ✗ | return ret; | |
| 31 | } | ||
| 32 | |||
| 33 | 9180 | static int wait_for_child(pid_t pid, int *ec) | |
| 34 | { | ||
| 35 | int status; | ||
| 36 | |||
| 37 | 9180 | pid_t ret = waitpid(pid, &status, __WNOTHREAD); | |
| 38 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (ret < 0) { |
| 39 | ✗ | log_errno("waitpid"); | |
| 40 | ✗ | return ret; | |
| 41 | } | ||
| 42 | |||
| 43 | /* The child process reports the lowest 8 bits of its exit code, which | ||
| 44 | * are treated as an unsigned integer on Linux. | ||
| 45 | * | ||
| 46 | * If it was killed by a signal, indicate that by negating the signal | ||
| 47 | * number. */ | ||
| 48 | |||
| 49 |
2/2✓ Branch 0 taken 9144 times.
✓ Branch 1 taken 36 times.
|
9180 | if (WIFEXITED(status)) { |
| 50 | 9144 | *ec = WEXITSTATUS(status); | |
| 51 |
1/2✓ Branch 0 taken 36 times.
✗ Branch 1 not taken.
|
36 | } else if (WIFSIGNALED(status)) { |
| 52 | 36 | *ec = -WTERMSIG(status); | |
| 53 | } else { | ||
| 54 | ✗ | log_err("This shouldn't happen: %d\n", status); | |
| 55 | ✗ | *ec = 1; | |
| 56 | } | ||
| 57 | |||
| 58 | 9180 | return 0; | |
| 59 | } | ||
| 60 | |||
| 61 | ✗ | int process_execute(const char *args[], const char *envp[], int *ec) | |
| 62 | { | ||
| 63 | ✗ | pid_t child_pid = fork(); | |
| 64 | ✗ | if (child_pid < 0) { | |
| 65 | ✗ | log_errno("fork"); | |
| 66 | ✗ | return child_pid; | |
| 67 | } | ||
| 68 | |||
| 69 | ✗ | if (!child_pid) | |
| 70 | ✗ | exit(exec_child(args, envp)); | |
| 71 | |||
| 72 | ✗ | return wait_for_child(child_pid, ec); | |
| 73 | } | ||
| 74 | |||
| 75 | ✗ | static int redirect_and_exec_child(int pipe_fds[2], const char *args[], const char *envp[]) | |
| 76 | { | ||
| 77 | ✗ | int ret = 0; | |
| 78 | |||
| 79 | ✗ | file_close(pipe_fds[0]); | |
| 80 | |||
| 81 | ✗ | ret = dup2(pipe_fds[1], STDOUT_FILENO); | |
| 82 | ✗ | if (ret < 0) { | |
| 83 | ✗ | log_errno("dup2"); | |
| 84 | ✗ | return ret; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | ret = dup2(pipe_fds[1], STDERR_FILENO); | |
| 88 | ✗ | if (ret < 0) { | |
| 89 | ✗ | log_errno("dup2"); | |
| 90 | ✗ | return ret; | |
| 91 | } | ||
| 92 | |||
| 93 | ✗ | return exec_child(args, envp); | |
| 94 | } | ||
| 95 | |||
| 96 | 9180 | int process_execute_and_capture(const char *args[], const char *envp[], | |
| 97 | struct process_output *result) | ||
| 98 | { | ||
| 99 | static const int flags = O_CLOEXEC; | ||
| 100 | int pipe_fds[2]; | ||
| 101 | 9180 | int ret = 0; | |
| 102 | |||
| 103 | 9180 | ret = pipe2(pipe_fds, flags); | |
| 104 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (ret < 0) { |
| 105 | ✗ | log_errno("pipe2"); | |
| 106 | ✗ | return -1; | |
| 107 | } | ||
| 108 | |||
| 109 | 9180 | pid_t child_pid = fork(); | |
| 110 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (child_pid < 0) { |
| 111 | ✗ | log_errno("fork"); | |
| 112 | ✗ | goto close_pipe; | |
| 113 | } | ||
| 114 | |||
| 115 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (!child_pid) |
| 116 | ✗ | exit(redirect_and_exec_child(pipe_fds, args, envp)); | |
| 117 | |||
| 118 | 9180 | file_close(pipe_fds[1]); | |
| 119 | |||
| 120 | 9180 | ret = file_read(pipe_fds[0], &result->data, &result->data_size); | |
| 121 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (ret < 0) |
| 122 | ✗ | goto close_pipe; | |
| 123 | |||
| 124 | 9180 | ret = wait_for_child(child_pid, &result->ec); | |
| 125 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 9180 times.
|
9180 | if (ret < 0) |
| 126 | ✗ | goto free_data; | |
| 127 | |||
| 128 | 9180 | goto close_pipe; | |
| 129 | |||
| 130 | ✗ | free_data: | |
| 131 | ✗ | free(result->data); | |
| 132 | |||
| 133 | 9180 | close_pipe: | |
| 134 | 9180 | file_close(pipe_fds[0]); | |
| 135 | /* No errno checking here, we might've already closed the write end. */ | ||
| 136 | 9180 | close(pipe_fds[1]); | |
| 137 | |||
| 138 | 9180 | return ret; | |
| 139 | } | ||
| 140 | |||
| 141 | 18360 | int process_output_create(struct process_output **_output) | |
| 142 | { | ||
| 143 | 18360 | struct process_output *output = calloc(1, sizeof(struct process_output)); | |
| 144 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 18360 times.
|
18360 | if (!output) { |
| 145 | ✗ | log_errno("calloc"); | |
| 146 | ✗ | return -1; | |
| 147 | } | ||
| 148 | |||
| 149 | 18360 | output->ec = 0; | |
| 150 | 18360 | output->data = NULL; | |
| 151 | 18360 | output->data_size = 0; | |
| 152 | |||
| 153 | 18360 | *_output = output; | |
| 154 | 18360 | return 0; | |
| 155 | } | ||
| 156 | |||
| 157 | 18360 | void process_output_destroy(struct process_output *output) | |
| 158 | { | ||
| 159 | 18360 | free(output->data); | |
| 160 | 18360 | free(output); | |
| 161 | 18360 | } | |
| 162 | |||
| 163 | 9180 | void process_output_dump(const struct process_output *output) | |
| 164 | { | ||
| 165 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 9180 times.
|
9180 | log("Process exit code: %d\n", output->ec); |
| 166 |
1/2✗ Branch 1 not taken.
✓ Branch 2 taken 9180 times.
|
9180 | log("Process output: %zu bytes\n", output->data_size); |
| 167 | 9180 | } | |
| 168 |