2 * Operating System Interface
4 * This provides access to useful OS routines for the sandbox architecture.
5 * They are kept in a separate file so we can include system headers.
7 * Copyright (c) 2011 The Chromium OS Authors.
8 * SPDX-License-Identifier: GPL-2.0+
17 * Access to the OS read() system call
19 * \param fd File descriptor as returned by os_open()
20 * \param buf Buffer to place data
21 * \param count Number of bytes to read
22 * \return number of bytes read, or -1 on error
24 ssize_t os_read(int fd, void *buf, size_t count);
27 * Access to the OS read() system call with non-blocking access
29 * \param fd File descriptor as returned by os_open()
30 * \param buf Buffer to place data
31 * \param count Number of bytes to read
32 * \return number of bytes read, or -1 on error
34 ssize_t os_read_no_block(int fd, void *buf, size_t count);
37 * Access to the OS write() system call
39 * \param fd File descriptor as returned by os_open()
40 * \param buf Buffer containing data to write
41 * \param count Number of bytes to write
42 * \return number of bytes written, or -1 on error
44 ssize_t os_write(int fd, const void *buf, size_t count);
47 * Access to the OS lseek() system call
49 * \param fd File descriptor as returned by os_open()
50 * \param offset File offset (based on whence)
51 * \param whence Position offset is relative to (see below)
52 * \return new file offset
54 off_t os_lseek(int fd, off_t offset, int whence);
56 /* Defines for "whence" in os_lseek() */
62 * Access to the OS open() system call
64 * \param pathname Pathname of file to open
65 * \param flags Flags, like O_RDONLY, O_RDWR
66 * \return file descriptor, or -1 on error
68 int os_open(const char *pathname, int flags);
73 #define OS_O_MASK 3 /* Mask for read/write flags */
74 #define OS_O_CREAT 0100
77 * Access to the OS close() system call
79 * \param fd File descriptor to close
80 * \return 0 on success, -1 on error
85 * Access to the OS exit() system call
87 * This exits with the supplied return code, which should be 0 to indicate
90 * @param exit_code exit code for U-Boot
92 void os_exit(int exit_code) __attribute__((noreturn));
95 * Put tty into raw mode to mimic serial console better
97 void os_tty_raw(int fd);
100 * Acquires some memory from the underlying os.
102 * \param length Number of bytes to be allocated
103 * \return Pointer to length bytes or NULL on error
105 void *os_malloc(size_t length);
108 * Access to the usleep function of the os
110 * \param usec Time to sleep in micro seconds
112 void os_usleep(unsigned long usec);
115 * Gets a monotonic increasing number of nano seconds from the OS
117 * \return A monotonic increasing time scaled in nano seconds
119 u64 os_get_nsec(void);
122 * Parse arguments and update sandbox state.
124 * @param state Sandbox state to update
125 * @param argc Argument count
126 * @param argv Argument vector
127 * @return 0 if ok, and program should continue;
128 * 1 if ok, but program should stop;
129 * -1 on error: program should terminate.
131 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
134 * Types of directory entry that we support. See also os_dirent_typename in
138 OS_FILET_REG, /* Regular file */
139 OS_FILET_LNK, /* Symbolic link */
140 OS_FILET_DIR, /* Directory */
141 OS_FILET_UNKNOWN, /* Something else */
146 /** A directory entry node, containing information about a single dirent */
147 struct os_dirent_node {
148 struct os_dirent_node *next; /* Pointer to next node, or NULL */
149 ulong size; /* Size of file in bytes */
150 enum os_dirent_t type; /* Type of entry */
151 char name[0]; /* Name of entry */
155 * Get a directionry listing
157 * This allocates and returns a linked list containing the directory listing.
159 * @param dirname Directory to examine
160 * @param headp Returns pointer to head of linked list, or NULL if none
161 * @return 0 if ok, -ve on error
163 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
166 * Get the name of a directory entry type
168 * @param type Type to cehck
169 * @return string containing the name of that type, or "???" if none/invalid
171 const char *os_dirent_get_typename(enum os_dirent_t type);
174 * Get the size of a file
176 * @param fname Filename to check
177 * @return size of file, or -1 if an error ocurred
179 ssize_t os_get_filesize(const char *fname);